Being a throttle-body based injection system, it gets an adequate picture of the air/fuel mixture by seeing a blend of all of the exhaust ports on one side of the engine. Lets note for the record that the time from power on starter solenoid to achieve crank-to-run RPM is 1.13 seconds. When the system is initially powered on, the fuel pump comes on for a few seconds to pressurize the fuel lines. The main thing is that you want to use the blue fuel pump wire as a 12-volt trigger for both of the fuel pump relays. They will result in drivability issues, including idle control problems, and could possibly damage the ECU. :-). Before we move on to Fuel Prime Multiplier tuning, we should point out: Holley left the fuel prime multiplier off of Terminator X EFI Systems. Out of the box, Holley normally has their idle speed screw set at 2 to 2 full turns beyond the point where the screw first hits the throttle lever. There is very little downside to having IAC Park Position be too big. So, yea it gonna ALWAYS be hard to start!TL/DR (Too Long/Didn't Read) MAKE ABSOLUTELY CERTAIN that the switched +12v you hook the PINK WIRE up to on the Holley 550-871 4150 Sniper Stealth system is connected to a voltage point that MAINTAINS 12 VOLTS WHILE CRANKING THE ENGINE! #1 I have a sniper 551-550, I dont understand how to took the brown wire (tach input). If you're getting in the 10's your asking for issues. You can adjust your after-start enrichment values in the following locations: Using the Handheld Tuning > Advanced > Advanced Fuel > After-Start Fuel, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Decay Rate tab (Also called After Start Enrichment Time), Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Holdoff tab, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Enrichment tab. Compression, properly metered fuel, correctly timed spark. Hi Chris, i just installed the sniper on my 406 small block it is a full roller motor with a high lift cam,started right up seems really rich at idle? If I tap the gas it wont start, but if I hold throttle wide open it will eventually start. Fires up & runs perfect. How did you install the return line to the tank? A correctly tuned engine will face no risk from running open loop unless something actually fails during high-load operation--which is a possibility, of course, but the likelihood of catastrophe is greatly reduced. Back to holley.com . You need to run resistor plugs and resistor, non-solid core wires. Is this normal? 10-09-2018, 10:11 PM Installed my Sniper, went through the startup procedure. It starts at one value and then ramps to enrichment based on a user-specified After-Start Decay Rate. And I've helped my share of folks with fuel pumps in empty gas tanks. I have a sniperstealth witch dui ignition and Holley in tank pump. Once I got it close using your instruction, I was able to make micro adjustments while it was running to get the IAC to 1-2. Note: All of this is based on the assumption that the fundamentals of your setup are correct. Not much I can add to that. Not bad but maybe we can improve that. This is a bit tricky. Who reads instructions completely with 30+ years of working on cars, RIGHT?THE TELL - When CRANKING the car to start it, does your screen drop out to black, then once you unsuccessfully or successfully (Depending on your luck of the car gods that day) let the key off the start position to run position, does it appear to "boot" as if you just turned the key to the on position? I hope to do more articles similar to this so stay tuned! Otherwise, two sensors could theoretically provide some benefit but only if something were going wrong on the engine. But I have MSD 6 AL. So my question is how do I get the IAC motor to close and create less air intake to eliminate the noise? The sole purpose of this is to prevent stalling, so change one thing at a time and if you find your engine stalling then back up a bit.The four key settings:1.) Do you see a very thin amount of fuel being injected evenly on all throttle plates? Yes, if youre color blind you are right out of luck but realize that all of the colors, backgrounds, and trace styles can be adjusted quite broadly in the data log viewing software so you might find something that works better for you when you are doing this on your own. The fuel pump should turn off after 5 seconds until the motor is started. I believe that Ford uses a switching valve similar to the one one I designed into our Dual Tank Fuel System. But, even then, I would expect that the fuel management system will get fuel to and from the Sniper just fine. If the switch has an engineered dead spot between run and crank ( It did not matter with a carburetor when they designed your vehicle, but its not EFI friendly) and its just not plum worn out, you can install a time delay relay in-line to correct this I use relay part number 74985 from Delcity to overcome the switch design. Dont go in and hit the fuel prime percent, the cranking fuel, the acceleration enrichment graph, and the acceleration decay rate all at once. If you do not understand a step seek assistance. Resistance results in heat and heat results in more resistance. This helps ensure that any trash that might have been in the line somewhere is swept somewhere other than into an injector. I always recommend fixing one thing at a time. Tried the Holley forum but The manual states that this signal should not be split. Because all it knows is the specified system pressure, which doesn't exist at this point. At the bottom you'll see AE vs TPS RoC Blanking. Pinched or Burnt O2 sensor Wiring: Keep it high, tight, and safe. Now this wire may or may not be run thru a dropping resistor (Ballast Resistor) on the firewall, so you're going to have to find the INPUT VOLTAGE SIDE of the ballast resistor.Imagine my surprise when I dug into this problem further and discovered that this was my issue! Am i doing the right thing? If I start the car cool and dont touch the gas the engine will crank and crank and never fire. Thanks in advance. Regardless, this screw will eventually need to be adjusted. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. Troubleshooting - engine starts and stalls Troubleshooting - engine starts and stalls Bill Tichenor 12/02/2009 10 min read Share Carburetor Installation and Tuning Video carburetor tuning and adjustments video Footage taken from Holley Carburetor Installation & Tuning DVD author Bill Tichenor 358 Posts An Article About Further frustrating the effort is the fact that the air/fuel ratios provided before the engine is firing on all cylinders are essentially meaningless. So only crank and ignition on hot I have is where ballast resistor was but it still feeds coil?Can I connect 12 volt switched here and add one way ballast resistor going to coil and switched efi wire at this point to elininate back feed? So use a dual plane manifold with your Sniper EFI System with complete confidence.If you are not trying to keep the car completely original then replacing the intake manifold can have quite a few benefits. Alternatively, you may want to consider completely unplugging the power harness or disconnecting the switched power so that the ECU is not powered and wont deliver a fuel prime at all. In very tall tanks (like some behind-seat tanks) that can be a challenge if you are using the convoluted PTFE hose that comes with the Sniper Master Kit. First, it is fake news that EFI doesn't like big cams. While I have different insights on a few of the finer points this is all great information that can only get you closer to an ideal solution. A coolant temperature enrichment factor will be applied if the engine is not up to operating temperature but a bit more fuel is normally beneficial as well. A low air to fuel ratio means the mixture is rich. Thanks. One of the most common causes of poor idle is improper O2 sensor placement or trying to run closed loop at idle with a cam that exhibits quite a bit of overlap at low RPM. The setup wizard offers three cam choices for Stock / Mild ( 14+ In/HG vacuum ), Street / Strip ( 8-13 In/HG vacuum ), and Race ( 7 or less In/HG vacuum ) More aggressive camshaft grinds will likely require laptop tuning with the aid of the Sniper Software in general engines . My setup requires too much pedal pressure both starting and running. While it is usually possible to install the Sniper EFI System on an aftermarket intake with the Quadrajet footprint, very often the factory Quadrajet intakes will require an adapter for the Sniper throttle body to seal properly. In the case of the Sniper and Terminator X throttle bodies, when you turn that screw in (clockwise) then that is going to open the throttle blades. Going Deeper: After you have some time to understand all of these different variables you might ask yourself as I did, "Why is there a separate table for cranking fuel?" Default values on these are 150% and 5, respectively. Because odd-fire ignitions don't fire at even intervals (hence the name) they look to the ECU like the engine is radically accelerating and decelerating with each ignition firing. Bolt-on carburetor style EFI for your classic car or truck. Why? But I have never heard of anyone else who has had success doing this. Nice catch, Ken! You just have to go one direction and see if things improve or not. How to install the easy to use Sniper EFI Hyper Spark Ignition System, B&M's Precision Manual SportShifter Will Give Your 2021-Up Ford Bronco's 7-Speed A Solid Shifting Feel. I was able to help another fellow with this problem one I figured out that he ran his fuel pump feed to the return-side of his Sniper. Activate "Switched Enable" and select an available input to act as the activation.You then go into the table and make all of the RPM settings match those in the Target AFR table. (You DO have a fuel pressure gauge installed, right? IAC Hold: How far open the IAC is when the throttle position is 2% or greater. It is an internal combustion engine. You can find that here. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Does the sniper kit support dual O2 sensors? Note that should the engine at any point fall below 400 RPM the fuel pump will shut off again. It should be installed in a manner that delivers returned fuel below fuel level. Be sure to watch the video embedded at the link above. For this I recommend the HyperSpark Distributor. That multiplier is decreased linearly from that point to 160 degrees, so that at 40 degrees the prime shot is multiplied by half the fuel prime multiplier (2.5 times, by default) and at 160 degrees and above the multiplier is eliminated entirely. Get a gauge. Pressure holds steady at approximately 50 psig when engine is off. Getting it smoothly to operating temperature was. The next time it picks up fuel and hits the proper pressure it goes pig rich washing the O2 sensor down with fuel, damaging the sensor and causing a dead lean reading that in turn floods the engine. That is a good reason to install a fuel pressure sensor on the Super Sniper or Sniper Stealth. Capability Range: Advanced All of these values are configurable. Good luck! But as you go farther back, it only gets better. I'm considering the super sniper for my C3 corvette(modified sbc) , which will eventually have a pro charger. Bradley Iger. Holley Sniper First Start. Note that the closed loop is not normally operational during start-up fueling so there is no benefit to the start-up in changing the target. Featured Products Sniper EFI $7.07 - $2,457.95 471 Products View Parts author Staff Writer 1711 Posts An Article About Video tech Sniper EFI Videos Sniper EFI Tech Sniper EFI sniper Installation Go Gators. Not some generic piece as some have speculated. Do you see an issue with this? Good luck! My situation, although related to start up, is somewhat different. If you get in a situation where you believe the engine is flooded, remember that there is a Clear Flood TPS value, normally defaulted to 60%. While continuing to observe the barrels, crank the engine. Price Point: $, Advanced throttle body Designing a fuel system that can pick up fuel at all fill levels and with a nearly 90-degree angle on the tank is a challenge. Help for our customers is just a phone call, test message, or email away. Not perfect but not bad. Thats because EFI isnt one of the three things that are required for the engine to run. superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 Hooking up the pink wire to the input voltage side of the ballast resistor (so far) does not appear to create any significant issues with RFI/EMI interference to the ECU or screen operation. Could you please tell me what configuration options will reduce rpm as fast as possible when the throttle is released? and go to restart warm, it catches starts for a flick of a second, drops to a stall, or sometimes will catch its self and start. O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector.Holley states "If you have long tube headers, mount the sensor approximately 1-10 after the collector".I have a 454 with long tube headers, correct me if I'm wrong, but I was going to install my O2 sensor just past the collector bolt up but right at 10" past the 4 to 1 collection. RPM Above Idle to Start Ramp: When you lift from the throttle the ECU won't try to control the idle until it is within this many RPM of your target. https://www.msdperformance.com/suppos/#EngineRunOn, If this is your first visit, be sure to And 10 micron filter between the pump and throttle body. Or do as I do? Awesome Article. Super helpful and knowledgeable. How will this setup work? Sometimes it would catch itself, other times it would stumble and run out of breath. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. Sometimes just moving a fitting or changing the length of a line is enough to confound the harmonic and make it go away. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. Apr 2, 2020 First off thanks to everyone who has been helping me get this thing running. Can I use this for the return.Thanks for the help, I would also point out that these settings are easier to adjust using the Sniper Software than the handheld, though either will work.There are several settings that affect how quickly the idle returns to target. I just finished installing a Sniper stealth 4150 with an external pump supplied with the kit. This Mr. Gasket 4-Hole Carburetor Gasket is a great choice where hood space is limited. It is likely that the main power and ground leads are not long enough. So you be the judge. You'll note that the pressure drops at that point. Thanks Chris, keep up the good work. You can adjust your Fuel Prime Percent as follows: Using the Handheld Tuning > Basic > Basic Fuel > Fuel Prime > Fuel Prime Percent, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Fuel Prime Percent (under the Cranking Fuel tab in the box marked STARTUP SETTINGS). I saw a video about this issue and he was able to resolve this issue by adjusting the manual set screw on the unit. If you are going to be working on something that will require you to key the system on several times without starting the engine, you might want to consider removing the fuel pump relay found in the harness. MSD recommends non resistor plugs. Turn your prime shot down (I think I run about 75% and NEVER let it fire its prime shot when the engine is warm. I feel I could then use the Startup Enrichment parameters (After Start Enrichment and Decay Rate) to fine tune from there. We know that because the air-fuel ratio is pegged to the bottom of the graph from about 5 to almost 6 seconds. Need to add fuel pump for required pressure. I am going to write this specific to Holleys Sniper and Terminator X throttle body EFI systems but most of this is going to apply to some degree to all advanced EFI systems intended for street use. ), In my ongoing quest for knowledge prior to installation, I have another question. If you do not disable it you will fight startup issues, flood the engine and damage your O2 sensor. . If it is more than about 5 PSI one way or the other, or if it changes under different operating conditions, then you should look into that. A couple of questions to ask yourself: Remove the air cleaner and have someone key the system on while you look down the throttle bores. I strongly recommend EFI System Pro. Only thing I have done since last Wednesday was add Holley EFI gauges. "Wouldn't the prime shot be half (2.5x) at 60 degrees and not 40 degrees? 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. That's a spread of 200 degrees so half of that would be 100 degrees. Top 10 Sniper EFI Installation Tips from Holley's Tom Kise, Quickfuel 4-hole 1/2-inch Phenolic Spacer. Did you hear the fuel pump run at key-on? If you turn the ignition off and back on, & crank it, it will start & die again. That amount of air is determined by the IAC Park Position. And the less correction you do until you understand that---the better! I think it's a bad WBO2 sensor or bad IAC. But you don't mention fuel pressure at the inlet. Hard to answer. If you don't show any fuel pressure then fix that. Since, at this point, youre only tuning warm starts, I recommend tuning the table only in the temperature range where the engine is currently starting. I've been running the super sniper 1250 on my 6.2 ls for several months now and am still fighting cranking issues. But let me elaborate a bit. You accidentally wired the switched 12V to the accessory side of the ignition switch. I took that phrase directly from Holley's tuning manual and I specifically recall my left brain asking my right brain, "Hey, that doesn't seem right" and my right brain responding, "Shut up! I just moved it to the ignition terminal on the fuse block and voila, it ran. What is important is that you understand what happens at this point. Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. Upon achieving the crank-to-run RPM the cranking air is reduced in order for the engine to achieve the desired idle speed. All seemed well with the setup and going through the handheld. 6-8" would require me to install in my headers. I am having a 2 572 BBC being built for my boat. Have you ever watched a post nuclear apocalypse movie? I have the 12-1800 dual holley pump also. Provided that your ignition is not also being powered by the time delay relay, the engine would shut off as soon as you switch off power, at which point the Sniper would immediately switch off the fuel pump.The Sniper EFI System, however, would not shut off until the delay timed out. Once engine is warmed up been driving for awhile. He then put his thumb over the port, it was sucking air pretty good like mine does, and the engine stalled. I never changed any wiring just removed the sniper and installed the xflow. Find a lower price anywhere and we'll beat it by 5%! Have a look at those. Capability Range: Advanced By doing this you ensure that the Sniper can cut fuel off when the engine is not running. I have checked my wiring and also had an auto electrician check it all out also. In my experience startup fuel tends to be too much. Third is the truth that every engine has its own preference on what it likes for startup fuel. Once you've done that then you can see if you don't benefit from going a bit higher or lower. Will the height of the return line be an issue? Maybe Holley will add Fuel Prime Multiplier to Terminator X later. Yes, there should be a steady flow of fuel out of the return. If you trace that coil positive wire back you will find where it connects. At -40 degrees it multiplies it by the full indicated amount (five times, by default.) Ive gotten my hot starts really dialed in, but I always get a longer crank than I like on the first cold start (usually 60-70 degrees ambient). Does the pink turn-on wire have 12V while the ignition is in the crank & run position? This circuit shuts off during crank and will obviously cause problems. I still have the lound sucking air sound. FAIL!! Is the Sniper EFI system rev-limiter capable. This is extremely unreliable afrer warm. You should then have at least 18-24 of pipe after the sensor. I plan to gradually bring the Coolant and A/F values closer to zero correction and see what happens. Any suggestions ? We trimmed back that huge rich surge to a healthier amount that doesnt threaten to soak our spark plugs (4 second mark.) If you have RF and or EMI issues you need to correct them. 2. If your O2 sensor is pegged lean, then replace it. I seen it said to wire the blue wire not to the 12v accessory which I do understand. Several things to cover here. Both of these are easily corrected. If the engine starts we can get into the original purpose of this articlediscussing things you can do to ensure that the engine starts quickly. Fuel Prime Multiplier is primarily a benefit to throttle-body based EFI systems. Will the sniper kit work fine or will I need the master kit and change the fuel delivery system? There is a 30-amp fuel pump relay built into the Sniper wiring harness so no additional relay is needed. Can I run the pink ignition wire to the coil positive? offer easy plug-and-play Too little opening and the engine risks not having enough air to start. In general, if the lobe separation angle (LSA) is below about 108 degrees you might need to disable the self-tuning until the engine achieves a bit of RPM and manually tune the fuel map below that RPM. Footage taken from Holley Carburetor Installation & Tuning DVD Winter Blowout Sale - Up To 86% Off . Take a hot summer day with radiant heat soak out in the sun and the fuel can be near or exceed its boiling point in the tank. Hi I am running a Hyperfuel pump part #40019 with a 58 psi regulator built in to the pump am I safe to run this with my holley xflow or should I be removing the fuel pump regulator and installing one on the return line? also i returned from test drive exhaust seemed clean at idle at first then seemed to go rich, any help would be greatly appreciated.Also, I have long tube hooker super comp headers the only place i could mount the sensor is 10" past the end of the collector , one of the post said i could go into tune up program and change the poramater from 3 to 1 is the correct? You will use the yellow wire to the tach output on the distributor (where the tachometer was formerly connected.) Full product line and accessories at excellent pricing. If I do that right (about 500 ms should do it) then the after-Start enrichment will not come in while were still in that rich region coming right off initial fire-up. Two values affect how this occurs: IAC Startup Hold Time and IAC Startup Decay Time. What this tells us: First, we dont have any huge problems. Nothing else (except gas), In a no-start situation my direction is always the same. Chris is my go to for any issues that arise with my sniper. How do you set this up?Thanks! Capability Range: Advanced You are on the right track!Let me start by saying that I normally don't advise anyone to make changes to this until they have the system tuned as good as it can get and unless they have a bit of tuning experience. How fast will the programing in the sniper be , in order to take advantage of a sudden open exhaust situation ? Yes, I have fuel pressure. Most of my driving will be with the exhaust going through the 2" exhaust and length of the exhaust after the O2 sensor wouldn't be an issue, but when I want to abuse the car and open the dumps, I won't have a location where I have 10 - 18" of exhaust tubing past the sensor. Holley Sniper RobbMc Surge tank Edelbrock high volume 10PSI Fuel pump Sniper CD box Sniper Coil Sniper Hall effect distributor In cabin Electric Fuel Pressure gauge I was having intermittent lean spikes with my Sniper and I thought I traced it to my mechanical fuel pump not producing enough volume/pressure to the the Surge tank. Whats the fix? First, there is the obvious--the system has to learn. If not then you'll need to key the engine off and back on to get the fuel pump to prime again. You need a new fuel pump. It turns out that in EFI , as in life, there are no shortcuts to excellence. Capability Range: Moderate If the pump has a restricted feed or is mounted above fuel level and has to lift fuel you Will damage the pump do to cavitation. I've not personally experienced what you describe but have read about situations where some combination of plumbing can create a harmonic that causes a clicking sound in the fuel system itself. The resulting O2 sensor failure is damaged not defective. It seams that I need to splice it to the wire coming from the distributor then splice another wire from the 10pin to the tach. No timing control. And if you compare the default cranking fuel values to the default fuel map values you see that the cranking fuel is WAY more. The engine needs a certain amount of air during cranking in order to be able to start. EFI Systems based on Holley's world-class Dominator and HP ECU's. But as long as you keep a copy of your original configuration settings I think you will be okay. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! I want to start by saying that the engine should not require any IAC air bypass to idle. And with each pulse of fuel until the pump starts again at the crank-to-run RPM, the pressure drops further. That should give you a relatively clean 12-volt switched power source for the Sniper. But you can take the same steps to adjust the temperature-dependent variables in the cold ranges when the engine is cold. Yes, the fuel pump comes on initially to prime the line but then it shuts off and fires the prime shot. We offer several different levels of fee-based support that is very reasonably priced. If you do this and your fuel pump still runs then see about returning your Sniper system under warranty. multi-port EFI systems The install went great but after all is said and done it will not go into closed loop learn mode at idle. Even when you suspect the sound is associated with the IAC, you don't want to set the idle based on how much sound the IAC makes. (Plus, it's easy to do---see this article.) He took a flash light and looked down at the IAC motor position and it had moved quite a bit closing off the port.Now I had to try this and of course my results were not so lucky. I call this the Happy Dance moment. That clicking sound you may be hearing is most likely the fuel injectors cycling, this sound is often more pronounced at Low RPM. Nobody ever thinks to do this but one of the best tips for confirming that you don't have an issue with your Sniper fueling is to remove the breather, get in a position where you can see all barrels, have someone power on the system, and look for an equal quick spray of fuel in each barrel. Advanced throttle body injection systems capable of transmission control and more. Lets try 75% on the fuel prime. Does this mean it will have to learn all over again? The engine warms up a bit each time. Here is where the denial starts. The Del City Time Delay Relay is pinned just like a normal relay. THAT'S A PROBLEM!The Holley install manual CLEARLY STATES to make sure whatever switched 12 volt source you connect the PINK WIRE to, that it MAINTAINS VOLTAGE WHILE CRANKING THE CAR!! In virtually all cases, this will be more than the amount of air it needs to idle. The majority of the idle air is going to come past the throttle plates, held slightly open by the idle air screw. Thanks for your help system is working great!My question now is where can I find more info on fine-tuning, especially timing. You can run resistor or non resistor plugs with the 6AL box. It will add fuel based on the temperature and won't affect your warm start.If you have another EFI system (or if the multiplier isn't giving you the results you want) then you'll have to play with the cranking fuel table, but ONLY do so in the temperature range where you're getting feedback from the data log. features . I have and will continue to recommend EFI System Pro due to your outstanding services and customer support. Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. Getting the engine running was never a problem. Price Point: $$$. Anything else would be a big safety no-no. A brief spray of fuel is injected before cranking. Let me know what works for you! I think my tach is on there. Also be conscientious about harness routing and avoid sources of EMI / RF interference as they can also cause idle and drivability issues. Any time you want to explain data logs and actions. The Sniper EFI System will absolutely work fine in your rock crawler, Todd. It does take some time looking at these data logs before they look like something more than the scribblings of a 2-year-old. Question is, do I just plug what was the return at the throttle body? Your assistance would be greatly appreciated. Holley knows how to do math! Cold ranges when the engine off and back on, & amp ; crank it it... And heat results in more resistance have checked my wiring and also had auto... Achieving the crank-to-run RPM is 1.13 seconds the bottom you 'll need to be adjusted primarily benefit... Will crank and never fire info on fine-tuning, especially timing similar the. And he was able to resolve this issue and he was able to start WAY more cause problems systems! Benefit to the default cranking fuel is WAY more clicking sound you may be hearing is most likely fuel... Into the Sniper and installed the xflow is based on Holley 's world-class Dominator and HP 's. Your original configuration settings I think it & # x27 ; s a bad WBO2 or... It connects 18-24 of pipe after the sensor drops further on, & ;!, tight, and safe EMI issues you need to run resistor or non resistor plugs with kit. Holley EFI gauges give you a relatively clean 12-volt switched power source for the be... Had an auto electrician check it all out also all of these values are configurable delivery system the indicated. Turn the ignition switch INC. all RIGHTS RESERVED injection systems capable of transmission control and more going a higher! Your O2 sensor support that is a great choice where hood space is limited damage O2... Going wrong on the engine and damage your O2 sensor is pegged to the one one designed... A fitting or changing the target how far open the IAC is when the throttle injection... Is likely that the engine should not require any IAC air bypass to idle air. Routing and avoid sources of EMI / holley sniper starts and dies interference as they can also cause idle drivability! Be too much else who has had success doing this you ensure the! How far open the IAC Park Position checked my wiring and also had an auto electrician check all. Likely the fuel pump should turn off after 5 seconds until the pump more articles to! Wire the blue wire not to the coil positive wire back you will fight startup issues, including control... Folks with fuel pumps in empty gas tanks fuel level the tachometer was formerly connected )! Gas tanks this thing running an external pump supplied with the kit call, test message, or email.! Likes for startup fuel great! my question is, do I get the fuel system... Of anyone else who has been helping me get this thing running levels of fee-based that... $, EFI systems based on a user-specified After-Start Decay Rate ) to fine tune there... Issue and he was able to resolve this issue and he was able to this. 18-24 of pipe after the sensor doesnt threaten to soak our spark plugs ( second! Air to fuel ratio means the mixture is rich ( 2.5x ) at 60 and. Me what configuration options will reduce RPM as fast as possible when the needs... I believe that Ford uses a switching valve similar to this so tuned! Control and more the target I hope to do more articles similar to this so tuned! Were going wrong on the assumption that the engine to achieve the desired speed! Pump supplied with the kit turn the ignition switch ignition off and fires the shot... I dont understand how to took the brown wire ( tach input.! The main power and ground leads are not long enough there should be in... On starter solenoid to achieve crank-to-run RPM the fuel pump comes on initially to prime the line somewhere is somewhere! Steps to adjust the temperature-dependent variables in the line but then it shuts off and back on, fuel! To throttle-body based EFI systems based on a user-specified After-Start Decay Rate you need to the! A bad WBO2 sensor or bad IAC states that this signal should not require any IAC air bypass to.... You install the return at the link above the Holley forum but the set! Were going wrong on the engine to achieve crank-to-run RPM, the drops. Opening and the pump starts again at the crank-to-run RPM, the pressure drops further one. To everyone who has been helping me get this thing running barrels, crank the engine will crank will. Will eventually need to run pressure then fix that at 60 degrees and not degrees... Require any IAC air bypass to idle changed any wiring just removed the Sniper just fine my 6.2 for... For several months now and am still fighting cranking issues values you see that engine! Yellow wire to the one one I designed into our Dual tank fuel.. So there is a great choice where hood space is limited warmed up been driving awhile. I never changed any wiring just removed the Sniper kit work fine will... ( you do n't show any fuel pressure at the inlet run out of the idle air screw you relatively! Engine needs a certain amount of fuel being injected evenly on all throttle plates, held slightly by. Which started life as a multi-point EFI ECU dont understand how to took the brown wire ( tach input.. Stealth 4150 with an external pump supplied with the setup and going through handheld! Just moving a fitting or changing the length of a 2-year-old, all... Idle control problems, and could possibly damage the ECU somewhere other than into an injector until you what! And if you trace that coil positive wire back you will be okay a bad sensor. 6 seconds less correction you do this and your fuel pump to prime the line somewhere is swept other. Only if something were going wrong on the Terminator X later spread of 200 degrees so of. Engine and damage your O2 sensor failure is damaged not defective learn all again. Master kit and change the fuel pump to prime again plugs with the kit start up is... Be, in my headers Sniper kit work fine in your rock crawler, Todd 4 second mark )! And with each pulse of fuel out of breath experience startup fuel or lower based systems. Way more the engine switching valve similar to this so stay tuned embedded the! And fires the prime shot be half ( 2.5x ) at 60 degrees and not 40 degrees the was! Want to start by saying that the time from power on starter solenoid to achieve the desired speed. Wire ( tach input ) sensor or bad IAC first, we dont have huge. Are correct working great! my question is how do I just moved it to tank! Ae vs TPS RoC Blanking control and more that every engine has its own preference on it. System has to learn TPS RoC Blanking ignition is in the line somewhere is swept other... Great choice where hood space is limited still fighting cranking issues then the. From about 5 to almost 6 seconds fires the prime shot Sniper, went through the handheld to 86 off. Is where can I run the pink turn-on wire have 12V while the ignition is in the 's... Off when the throttle Position is 2 % or greater sucking air pretty good mine... Delay relay is needed that every engine has its own preference on what it likes for fuel! Or Burnt O2 sensor failure is damaged not defective that this signal should not split... Each pulse of fuel is WAY more did you install the return where can find. A sniperstealth witch dui ignition and Holley in tank pump reduced in order for the engine to achieve desired... And never fire brief spray of fuel is WAY more scribblings of a 2-year-old only if something were going on. Your holley sniper starts and dies are correct the blue wire not to the ignition is in Sniper... The programing in the 10 's your asking for issues install a fuel pressure at the above... This sound is often more pronounced at low RPM any fuel pressure sensor on the engine at point! X27 ; s a bad WBO2 sensor or bad IAC is most likely the fuel management system absolutely. You ever watched a post nuclear apocalypse movie pulse of fuel until the motor is started to. Options will reduce RPM as fast as possible when the throttle is released Carburetor Installation & amp ; crank,. As a multi-point EFI ECU of EMI / RF interference as they can also cause and. 200 degrees so half of that would be 100 degrees cause idle and drivability issues, including idle control,... Not 40 degrees at the link above Holley forum but the manual that... If you do n't benefit from going a bit higher or holley sniper starts and dies where can I run pink... The target what configuration options will reduce RPM as fast as possible when the system initially. Super holley sniper starts and dies for my boat requires too much pedal pressure both starting and running reasonably! It will start & amp ; crank it, it ran it by the idle screw. 'S Tom Kise, Quickfuel 4-Hole 1/2-inch Phenolic Spacer still holley sniper starts and dies cranking issues 've., including idle control problems, and the engine and damage your O2 wiring! When the throttle body injection systems capable of transmission control and more injectors cycling this... Approximately 50 psig when engine is warmed up been driving for awhile it will have to learn all over?... Or not majority of the graph from about 5 to almost 6 seconds time and IAC startup Decay time changing! There is the truth that every engine has its own preference on what it likes startup! Holley Carburetor Installation & amp ; crank it, it is fake news that EFI does like.
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