- Verify Wiring - ECU must be powered and grounded directly at the battery and the battery is fully charged. The purple vertical line shows the current coolant temperature reading. The IAC parked position at 88 degrees is approximately 80% (plunger is pulled 80% of the way out of the IAC passage. I wished I had known about EFI pro when I started my project 3 yrs ago Chris you put out good information/visuals....will definitely be making my purchases with you from here out......You are very helpful I can only imagine if had purchased my sniper unit from you in the beginning. Capability Range: Professional The purpose of this instruction is not to provide a complete guide to troubleshooting idle conditions. Bolt-on carburetor style EFI for your classic car or truck. Advanced throttle body injection systems capable of transmission control and more. Very knowledgeable about the products they sell, always happy to talk you through your options and point you in the right direction. Found out that it was due to rfi/emi. EFI Systems based on Holley's world-class Dominator and HP ECU's. Super helpful and knowledgeable. If you get into the practice of hearing all three of these sounds you will know if you have a problem even before you turn the key to crank. In his infrequent missives Chris will let you know things like:. Sniper Progressive Secondary Link--A Great Solution for Abrupt Throttle!When folks install their new Sniper 4150, Super Sniper 4150, or Sniper XFlow on their high-horsepower engine, usually there are two reactions. Then do the same thing for the handle immediately to the right of the current CTS reading. It is virtually simultaneous with the fuel pump prime. With the engine off, remove the air cleaner. When he publishes a new article here in EFI Pro Hangout, When especially relevant new products are announced, When special offers or coupon codes are available. car is a third gen 1990 Chevy Camaro with flowmaster mufflers. Great Company! By controlling the airflow through the IAC passage this allows the ECU to control the RPM of the engine at idle. One coil (energized by one pair of wires) moves the shaft in. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Wish I had discovered this site before I purchased my unit. This may not solve your problem, but you can greatly simplify your Base Timing Table. Put an end to cold start issues, hesitations, vapor lock, and flooding. Sniper EFI Throttle Body 1 N/A Autolite 1100 Flange Sniper EFI Throttle Body Includes ECU, fuel injectors, Manifold Air Pressure (MAP) sensor, Throttle Position Sensor (TPS), and an Idle Air Control Valve (IAC) 7 Flange Gasket 1 Gasket for mounting throttle body to intake manifold. Let's start by giving a simple introduction to how the IAC works. On the end of this shaft is an angled plunger. Yes, it will talk to you--but not with words. Subscribe to the Chris's EFI System Pro Mailing List! In our example, above, the coolant temperature sensor finds the engine at 88 degrees. Replacement Idle Air Control (IAC) Motor for Sniper EFI 85/90/92/102mm Throttle Bodies and 90/95/105mm Holley EFI Throttle Bodies. What could go wrong with an IAC? I can't recommend EFI System Pro enough. The learn function will offset the base fuel table until the closed-loop compensation only requires minimal changes. This video shows you how to set the initial startup idle or if you want to reset your Holley Sniper EFI and reset the idle as well. I bought a new holley sniper , dual sync dist., coil, and holley in tank fuel pump, When engine got hot it would go crazy. Ignition parts - with EFI you need to run resistor plugs and resistor, non-solid core wires. This instruction is aimed primarily at the Sniper EFI System but you might find that you can adapt these concepts to any aftermarket EFI System. The broad consensus has been that the Sniper is an amazingly straight-forward install and starts and tunes as expected. Three things come to mind. Across the board, all of our customers say how impressed they were that it started and ran right out of the box just by following the simple installation instructions.… In our example, since the CTS says the engine is 88 degrees, the IAC Parked settings for the 80-degrees and 100-degree should be pulled down to zero. I am also planning to get the Holley distributor and Sniper fuel tank. carb and a mild performance camshaft. On the end of this shaft is an angled plunger. Another coil (energized by a second pair of wires) moves the shaft out. The ECU extends the IAC plunger to its limit, and assumes it is fully seated in the IAC passage and then takes it back out to the park position (normally around 50-80%, depending on the temperature of the engine.) One of the signs of a vehicle with a rough idle is a faulty Idle Air Control (IAC) Motor. If you hear the sound I describe then you should also confirm that the shaft is actually moving. Copyright © 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. Idle Tuning is a very important part of tuning any EFI system, especially our self-learning units like Sniper or Terminator X EFI. Those are the pulses that send the shaft out to the zero position and then back to the parked position for that temperature. The ECU initiating the IAC is the first sound you hear when  you key the system on. Fast shipping, great tech support. This is a great time to visually inspect the overall Sniper EFI install. The end of the plunger is flush with opening into the IAC passge when the IAC is somewhere around 75% on the unit I used for this article, but that's not to say that your IAC is going to be exactly the same. Getting the throttle blades and IAC to work together will keep your fuel injected hot rod running smooth and predictable. Is the stock GM Powerglide transmission compatible with … There is another instruction that is dedicated to Troubleshooting High Idle Conditions in the Sniper EFI System. HyperSpark Ignition for Sniper EFI; ... An idle air control valve or IAC is easily described as an electrically controlled vacuum leak. Don't forget to reset your IAC park position back to where they were before you started the test. Capability Range: Advanced When you key on, you will hear three distinct sounds:  The ECU initializing the IAC, the fuel pump priming, and the injectors firing their prime shot. Very Quick Shipping & Help Guides Have Been Invaluable For Setting Up My Holley Sniper. Holley Technical Training Manager Tom Kise recently published a list of ten "suggestions" for Sniper EFI System installation and I offer them here essentially unedited. It does not provide any feedback to the ECU on its position. I'm mostly kidding, but if you try this make sure nobody standing nearby has a camera and a social media account. One coil (energized by one pair of wires) moves the shaft in. Full product line and accessories at excellent pricing. Finally, if electromagnetic interference (EMI) is able to induce enough voltage on the control wires it could actually move the IAC shaft without the ECU being involved, which would cause the IAC to become "lost". First, In high-mileage vehicles the shaft can become jammed up due to a build-up of oil and debris. It is difficult to describe the sound but it sort of sounds like a plastic hair comb and pulled it across a hard edge. I don't quite see why it is pulling -50% at idle before you rev it. Perfect for street rods, muscle cars, off road trucks or nearly any carbureted vehicle. You should see the plunger come into view (as it closes the IAC airway) and then back partially or entirely out of view again. You can move the IAC setting for the bordering temperatures up and down and watch the IAC plunger respond each time you hit "Save". It is not a sensor, instead, it’s defined as an actuator since the ECU controls it. Qty: Add To Cart. That work continues today through Holley’s market-leading EFI products as well as through Holley’s family of best-in-industry brands. Easy and stress-free purchase from giving adv. Free ground shipping regardless of order size! As the plunger is withdrawn, it moves further and further away from this passage and allows more and more air through. If you happen to know the pin-out for your IAC then you can confirm this by testing the continuity across the two coils. See my instruction on How to Troubleshoot RFI/EMI in Sniper EFI Systems. In the original article, I mentioned I was not an EFI expert, but after some simple research – and with the help of the Holley tech line – I was able to inflict some simple adjustments to make the Sniper even better for my application.I started by adjusting the fuel prime – which squirts a small amount of fuel into the intake to aid in start-up. 9 3.5” Touch Screen Controller Holley markets the Sniper and Super Sniper as a simple carb replacement fuel-injection system, but the Sniper contains some very complex, sophisticated EFI software. *Possible delays due to Covid-19 click for more information. First, “Wow, does this deliver some amazing power!” Then, about the time they get Your IAC is sitting at 20% at idle, so I'd adjust the idle screw to achieve the 5-10% IAC Position at idle. It is reliant on the data acquired by the included wideband oxygen sensor. My sniper EFI 2300 (2F engine 1976 FJ55) is having a lot of problems on cold engine stalling out, self tuning has seemed to make it worse (than the default config) I was wondering if anyone could be so kind to share their config file for their 2F engine, (or something similar so I can have take a look at how others have approached this) WOW! The Sniper EFI system looks at the closed-loop fuel compensation required to reach your target AFR. Find a lower price anywhere and we'll beat it by 5%! Therefore, for the ECU to know exactly where the plunger is located relative to the IAC passage it must issue a series of pulses to completely close the IAC (the "zero" IAC position) before it can then use that as a reference from which it positions the plunger as desired. (The Sniper in the image is a bit older and Holley is prone to change components from time to time.). I have a 69 Camaro with a 350 V8 which has an Edelbrock 4 bbl. All Rights Reserved, This error message is only visible to WordPress admins, Dual Sync Distributor, Chevrolet Big Block Tall Deck 565-204BK. your exhaust system is sound; if leaking it will suck in air which will cause the O2 sensor to think the system is running lean which will then tell the injection computer to richen up the mixture and that is a BIG problem. It is just as important to know what the IAC does not do. Capability Range: Advanced Capability Range: Moderate Its very common for the Holley Sniper to have coolant temperature sensor problems from the very beginning straight from the Holley factory. Navigate to Home > Tuning > Advanced > Advanced Idle > IAC Startup and click on "IAC Parked". Troubleshooting High Idle Conditions in the Sniper EFI System, How to Troubleshoot RFI/EMI in Sniper EFI Systems. Price Point: $$$. It is not uncommon to question whether your Idle Air Control Motor (or IAC) on your EFI System is fully operational. Trust Holley to offer replacement electronic sensors that meet and/or exceed OEM specifications for performance! Emissions. Here you will see a graph of IAC park positions for various coolant temperatures. If you see that happening then the IAC is probably working. It does not reset itself to a known position when the Sniper EFI System is powered down. Ok, we have enough Sniper systems out there that I thought it would be a good idea to create a posting on challenges that might arise during installation. How to Set IAC Correctly Holley Sniper EFI The whole trick here is to put a strong piece of tape over the IAC hole so no air can be sucked in by the IAC, or idle air control valve. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Another coil (energized by a second pair of wires) moves the shaft out. You can do that by looking down into the IAC opening with a flashlight while having someone key the system on. Replacement Idle Air Control (IAC) Motor for Sniper EFI TBI Systems, Sniper 90/92/102mm Throttle Bodies, Terminator TBI, Avenger 4bbl TBI, HP 4bbl TBI, Commander 950 & Digital Pro-Jection Systems. Second, In addition to wiring or other external connectivity issues, the coils themselves can fail. When fully extended, it completely blocks air from passing through the I… The purpose of this instruction is to help you confirm that your IAC is working correctly. 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. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. great information. ), This image shows the IAC passage (triangular opening between throttle barrels) with plunger fully inserted (set at zero.). That would require that the IAC be replaced. Removed all the unused wires from harness and wrapped all the remaining wires and harness with rfi shielding tape. I bet you if you bump the idle range to 20°-25° then that will help your CL Comp. $67.37. It is essentially a very simple linear actuator that moves a shaft in and out based on a series of pulses to a pair of coils. Go to the handle (little square box) for the temperature immediately to the left of the current CTS reading and move it all the way down to zero. It felt like it was flooding out at low speed, low RPM. At this point it would not work correctly again until the IAC was re-zero'd by the ECU. You should make a note of the position before you change it so you can return it to the current configuration or, alternatively, save a copy of your configuration so that you can upload it back after you complete the test. Power on the system but do not start the engine. Watch below as Jeremy talks you through getting your idle absolutely dialed in on your Sniper EFI equipped vehicle. At this point, If you click "Save" you should hear the IAC respond, and when you look down into the IAC opening you should see the end of the plunger protruding about 3/8-inch into the IAC opening, fully blocking the air flow. The idle air control valve is a valve that adjusts air to create idle stability. These aren't generic newsletters either but instead personalized emails. It is not very loud and may, in fact, be masked by the fuel pump noise. Holley just brought EFI within range - introducing Sniper EFI! If you are so inclined, you can perform mouth-to-IAC resuscitation and no air should be able to pass. At times you might find that your idle is not behaving as you expect--too high, too low, or erratic. When fully extended, it completely blocks air from passing through the IAC passage and into the intake manifold. However, most of the information is directly applicable to Terminator X so we invite those owners to use this as well. RPM going up and down , miss firing and backfiring. Jump on board now! and bolts. This article was originally written to describe how to test the IAC functionality the Sniper EFI System. Taking some time to fine-tune the idle on your Holley EFI system is one of the best ways to ensure you have a consistent and predictable powerplant under the hood of your hot rod. It is essentially a very simple linear actuator that moves a shaft in and out based on a series of pulses to a pair of coils. You can unlock the sophisticated features inside the Sniper by merely popping the SD card out of the hand-held and plugging it into a laptop or desktop computer. This can often be cleared with a blast of aerosol carb cleaner. Considering buying a Holley Sniper EFI system and Holley distributor. Please keep up the information. It’s economically priced so you can have all the benefits of EFI and still have money to finish or upgrade the rest of your ride! The fuel injected throttle body is hunting at idle uncontrollably. My Bronco with Holley Sniper EFI was running poorly. Let's start by giving a simple introduction to how the IAC works. Tested my o2 sensors and determined the ECU on my Holley Sniper Efi is bad. Then let us give you one more hot tip: Subscribe to the Chris's EFI System Pro Mailing List! 8. Note that you are REALLY going to wish you had that stylus that came with your Sniper to adjust these handles--they are almost impossible to do accurately with your finger. Part# 543-34. ... and noticed the O2 sensor reading, AFR, was steady climbing, and actually topped out … I reprogramed the Sniper several times. Be sure you … Pink Wire must be attached to a 12V+ switched source that has voltage during cranking and run positions of … Don’t buy your EFI anywhere else. The best customer service I've ever had, not one of these companies that are not interested once they've got your money. But on the Sniper EFI System you can actually test this a little bit more precisely using the handheld touchscreen controller and these steps: Note:  This process will involve you changing the IAC parked position for testing purposes. It is a good idea to get in the habit of listening to your Sniper EFI System. Bolt-on carburetor style EFI for your classic car or truck. Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's.
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