Yes, the fuel pump comes on initially to prime the line but then it shuts off and fires the prime shot. Clicking, ticking and sucking sounds. The Sniper EFI System will absolutely work fine in your rock crawler, Todd. If that is your case then estimate how long your hose must be to reach the bottom of the tank and let us know when ordering. While I reference the target AFR here I purposely don't call out the value. Stay after it--you'll make it happen! If not, then the orientation of your O2 sensor is not your problem. transmission control and more. Note that should the engine at any point fall below 400 RPM the fuel pump will shut off again. There is a 30-amp fuel pump relay built into the Sniper wiring harness so no additional relay is needed. 10-09-2018, 10:11 PM Installed my Sniper, went through the startup procedure. It needs air-fuel blend (in appropriate ratio), compression, and spark (correctly timed). seems to be running rich at a idle. 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. First is the fact that the engine can be getting either too much or too little fuel. Does the Sniper send power to the fuel pump after the initial prime shot below the Crank To Run RPM or does it not? If you . A throttle linkage extender and a progressive linkage kit. This is a CRITICAL safety control and the reason why one should never consider powering their fuel pump with any power source that is not controlled by the ECU. to the same number as 4.) Love the example at the end. Figure out what it's not getting and the find out why. Thanks. The mid-way point between -40 and 160 degrees is 60 degrees, not 40 degrees. I really would like to replace the intake gaskets. i can hear the pump, but nothing is coming through the fuel line. Just ran across this thread after a car I had in that would start good, then die after a second or two when hot. Not much I can add to that. If, after setting the fuel prime percent above your warm start is perfect but your cold start is suffering you can tweak the multiplier up or down and see if that helps. Holley's Dominator and Enjoy! Thanks in advance. Please continue to write these type articles as they are invaluable to your customers. 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. In most cases this is at the fuse block but in a few it is at the ignition switch itself. New or not i have send dead item right off the shelf. The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. Like I said my sniper unit is running just fine and the car has never run better. Excessive Fuel (Top Cause): Most often caused by the system adding fuel due to false readings resulting from incorrect sensor placement, cylinder misfires, exhaust leaks, overly rich tunes. Granted, car was not on but still seemed like a lot of fuel to be returning. (Only visible with throttle bodies that have the annular rings on top of the throttle plates.). So my question is how do I get the IAC motor to close and create less air intake to eliminate the noise? This is normally completely adequate. Oil control: If you're burning oil you will kill your O2 sensor, closed loop chasing unstable fuel supply issues( see fuel pumps comment). 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?" If you turn the ignition off and back on, & crank it, it will start & die again. Latest Articles. Hi Chris,Thank you so much for your quick response to my query. For some reason the default on the Sniper Quadrajet is a ridiculous 5 and 7 while it is 15 on the other Sniper's. 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. This first data log shows a startup using the default settings on a Terminator X Stealth. Can I use this for the return.Thanks for the help, 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. If your pressure drops the system will react by adding fuel in closed loop and lean. Any suggestions ? Capability Range: Moderate If you're tuning a Sniper increase your multiplier and see how that affects you. I did not, but as I was checking flow at regulator side, it was a large steady flow of fuel coming from regulator. Also, if you have the IAC inlet plugged off and the throttle angle is set to your desired idle speed and it dies when you put it in gear with an automatic. I checked fuel lines to make sure I didn't reverse them. But I have never heard of anyone else who has had success doing this. You have that where you want it. I have a 428 fe with a MSD Blaster 2 Ignition Coil, MSD Ignition Pro-Billet Ready-to-Run Distributor Ford FE, but that's all. 4-hole spacers seem to work better than open spacers. The problem isn't the 55 PSI. Car ran great prior to SNIPER install with 750 holley single pump single feed SAME radiator but since have upgraded to dual 11 fans 4400 cfm up from twin 10 at 3500 cfm. 1964 Chevy Nova, 383 Stroker, AFR 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide Transmission. This is most easily done using the blue fuel pump wire. No timing control. Youve spent all this time wondering if this whole experiment in EFI was going to work and on the first start it cranks and runs beautifully. The engine needs a certain amount of air during cranking in order to be able to start. One thing I miss is the instant drop in rpms that my 650DP had. Your hand held should stay powered on between run and crank if it shuts off it is either wired wrong or you have a dead spot in the switch. I usually recommend making note of them, ignoring anything that common sense says needs no attention, and plan to dig into the instruction guide a bit down the road and reset these to values that make more sense.Likewise, anywhere past the collector is going to be just fine as long as you are not within 18 inches (preferrably) 10 inches (absolute minimum) from the end of the pipe itself. 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.) Awesome Article. Where do I start looking for the solution? Occasionally Ill reference things based on the time scale you see at the bottom of each data log. Activate Advanced Tables2. Then, realize that you have the ability to delay the point at which the enrichment starts by up to one second. Good point. It is also coming through the idle air port. Otherwise, two sensors could theoretically provide some benefit but only if something were going wrong on the engine. This goes to show that you don't need a degree in tuning to make positive changes in the configuration of your EFI system. Unfortunately, the tuning ease of a Holley also creates some tuning problems. Super helpful. Resistance results in heat and heat results in more resistance. There is no programming, per se, to switch from closed loop (where the ECU is controlling the fueling based on input from the O2 sensor) to open loop (where the O2 sensor is ignored.) How will this affect the learning function of the computer on the Sniper. Do you have fuel pressure? ), I have the sniper efi system with the holley retro-fit in tank electric fuel pump. Fix that.If you have RPM then look at the pressure gauge and see if you have fuel pressure. There should be no relay added to this wire. Need to add fuel pump for required pressure. A low air to fuel ratio means the mixture is rich. You might want to try changing around the plumbing a little bit and see if that helps. Why? My situation, although related to start up, is somewhat different. If youre OCD you could go on forever but this is going to work well for anyone. 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. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. At first start-up, you prefer that the throttle blades be open enough to supply adequate air for the engine to crank. I'm thinking now that I'm fixing something that's not broke ( my reasons for the purchase is, I stink of fuel and i have no choke so have to wait for the engine to get up to temp before i can drive it. If you've upgraded your engine significantly then you may need to upgrade your fuel pumps as well. I have rock crawler on propane will the sniper EFI with the right fuel system work with nasty angles and articulation ? Sounds like it is "only" burning through the initial priming shot. Holley Sniper EFI--Look, No ECU or Wiring Harness! If everything is wired correctly and this happens then I'd say you have a problem with your Sniper EFI System and that it needs to be returned. Goat Rope Garage 76.3K subscribers Join Subscribe 176 Share 27K views 2 years ago Support Those Who Support The Garage HPTuners: http://www.hptuners.com Show. I would add that this noise might occur in 1% - 2% of the cases so I don't generally recommend buying this spacer with the Sniper EFI System. 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. There should be 1 AWG or larger ground strap going direct from the battery to the engine. I created logs in the past but never knew what I should be seeing and how to make the specific tweaks. My fuel pump keeps running when the ignition is on but the motor is not. Unfortunately, the only way to do this is with the Sniper Software. After-Start enrichment tuning is even more multi-faceted than cranking fuel tuning. Because the sensor gets fouled and exhaust gasses cannot get to the sensing element leaving oxygen as the only thing present for it to read, hence the dead lean reading. Sure enough the pink wire DID NOT have voltage when cranking. Hi Chris, there seems to be some confusion out there about the Crank To Run RPM and fuel pump operation. Is one barrel not spraying at all? To be 100% honest I was having an issue prior and flooded it. This happens with some carburetors on dual planes as well. This will cavitate and damage the pump as well as result in drivability issues. Set the table type to Air/Fuel Ratio Offset4. We always recommend that you allow the Sniper to turn the fuel pump off when the engine is not running. My question is if both of my fuel pumps are wired from relays to my rocker panel where does the blue fuel pump prime wire connect or would you just not use it altogether. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. Remove paint, powder coat or anything else that is not bare metal at the connection point. 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. O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector. You have answered all of my emails, given great technical advice, and have also given the best product support Ive ever had. I have been looking at all efi units and I keep coming back to the Sniper. Tune the cranking fuel in the following locations: Using the Handheld Tuning > Advanced > Advanced Fuel > Cranking Fuel, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Cranking Fuel. ), Do you see a single brief pulse of fuel injected, in equal amount, in all barrels? Quick to respond and very knowledgeable. Do I still need the holley 12-753 30 amp relay. This Mr. Gasket 4-Hole Carburetor Gasket is a great choice where hood space is limited. If the fuel pressure is a little low don't worry about that. Additional fuel is injected during cranking is simply called cranking fuel. But I strongly suspect that is not the case. Thanks, Steve! But I suspect that's not the case here. I have two questions at this time: 1. They are the only ones got me a holley usb to can cable fast. 6-8" would require me to install in my headers. Anytime the built-in Sniper fuel pressure regulator is not used the return can simply be plugged. Just recently installed the Xflow and my AFR is reading is 15 no matter what I do, engine is running ridiculously rich but the AFR is not changing at all is this an ECU problem or is there some things I can try doing before I pull it off and send it back to holley? Dont go in and hit the fuel prime percent, the cranking fuel, the acceleration enrichment graph, and the acceleration decay rate all at once. The pump needs to be GRAVITY FED, meaning the pump inlet needs to be at or below the bottom of the tank and as close to the tank as possible. Nor can I really recommend that you split it as I have. The resulting O2 sensor failure is damaged not defective. 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. My car is going on the dyno for final tuning next week. Cheers Darren. features . I strongly recommend EFI System Pro. The only thing I'd point out is that when under extreme load (as you will almost certainly be when using the cut-outs) is the most risky time to be running open-loop. If you're getting in the 10's your asking for issues. Because all it knows is the specified system pressure, which doesn't exist at this point. Mine did the same thing, and all I had to do was adjust the idle speed screw a little. Is that correct? 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! Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Pin 30: To Battery The "Service AFTER the Sale" is why I came to EFI SYSTEM PRO, getting a system working with great support makes for a better installation and happy customers! This is the crank-to-run RPM. By going with an aftermarket manifold you avoid that issue entirely.Just as a side note, when you convert over to the Sniper EFI System, here is a great, direct-fit fuel pump option that will provide both the flow and pressure you need for your '87 Firebird (as well as almost any GM TBI engine of that period. 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. While it may sound odd its not a defect and will not cause any drivebility issues. Have a look at those. Power glide with 1.80 first gear, 6,200 converter. Capability Range: Moderate Had issues so Im now going with the Holley in tank pump. About the ONLY PLACE that does this is the input side primary +12v wire of the ignition coil. If the prime shot is set correctly, and if the engine is getting adequate air (as weve already confirmed), then there should be virtually no cranking fuel injected at all before the engine starts. I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. Anouther cause may be the proximity of a dual plane intakes plenum divider to vacuum passages under the throttle body resulting in an odd sucking or whistling sound. sniper Installation If you're installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! EMI is what wipes out all the electronics. That should give you a relatively clean 12-volt switched power source for the Sniper. If it cranks better then you know you're getting too much fuel. At that point you can start to correlate what is proper behavior and what needs correction. Do as I Holley says? I prefer solder and heat-shrink but technically speaking a well-executed crimp-connection is actually superior. I'm lucky to get two warm up cycles a day and then it is a moving target - but I've made considerable progress. You just have to go one direction and see if things improve or not. Not perfect but not bad. FSM Manuals Jeep Manuals. 4.) Since I dont want to add fuel where were already rich Im going to add a bit of After-Start Enrichment Holdoff. Regardless, this screw will eventually need to be adjusted.
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