So if you are trying to achieve a stoichiometric mixture in ethanol (which is achieved at an AFR of 9.0:1) then you should continue to target 14.7:1 since that is what will be displayed. You can re-enable this after you have completed this idle speed adjustment process. I have driven car about 200 miles. A good example of why it's so important to run a good pre filter in the fuel line. I know its not flooded because I can pour a little gas in the throttle body and play with the accelerator and it will start and run fine. If you have a bellcrank in your throttle linkage, ensure that the linkage is not engaging the bellcrank at an angle greater than 45 degrees at either end of the throw. Sniper EFI offers superior throttle response and wide-open throttle power. Its rare that you find someone that genuinely wants to help and see something work good, the information I have received from this page and Chris himself is top notch.1969 Dart GT 340 with a Holley Sniper, I purchased the Holley sniper from jegs wish I knew you sold them put on my truck got the IAC set haven't checked the -40 idle setting yet my problem is my headers are glowing red called Holley I think I got the worst person seemed to care less Afr is set at 12.8 for idle only thing I have changed I don't smell any fumes at idle someone said I could change the coolant temp enrichment but I don't know if it is rich or lean I figured since no smell it is lean any ideas would be appreciated thanks i have a fuel psi gauge reads 60 psi don't wanna melt my motor did not glow with a carburetor. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. While this video is not meant for the Sniper EFI user it does provide a great overview of how your ethanol tuning adjustments must be made not only to the base fuel map but to the other configuration settings. New install, when in setup wizard TPS says 90 percent and I checked the linkage and butterflies. On EFI systems such as Holley's Sniper, all of the EFI sensors (except for the O2 and coolant temperature sender) are mounted snuggly in the throttle body. Now it's at 5% on a big cam 440 Mopar. I'll bet you find that you can get it working great without any manual tuning. While adjusting the screw if the TPS position reads begins to read higher than 0% cycling the ignition switch will recalibrate the TPS back to zero. Usually it wont stay on 0% very long and soon changes to another number like 1 or 2%. The next time it happens is the perfect opportunity to find the problem. other things that might cause the idle to faulter, but this is a good start. I think that your Sniper system is working fine but would definitely check ouf the fuel pump. But I still get the iac at 0 and the rpm at 1200. If you did not rotate the distributor to set the actual timing to 15 that might be the only issue. You might have a bad O2 sensor, really bad exhaust leak or a problem with the ECU. The fix? Try it! Capability Range: Advanced Sniper EFI Problems - Holley Performance Products Forums Only show this user . Cracked casing from a side cover screw being installed crossed threaded. The "Gauge Text" is what would be shown on a 2-1/16 gauge or the Avenger handheld display. Installed sniper on 65 galaxie. Did your process to adjust idle to 860. My IAC was constantly at 100% at idle. And thanks again for taking your time to answer these questions. So, if pressing the throttle is making it start, it's because you're flooded.Which is consistent with your rich idle condition comment, right? Enjoy your Sniper! Duration @.050 is 240 intake 246 exhaust with .574/.578 lift. I keep doing that with the same result. IAC Calibration / Hanging rpms | Team Chevelle Yes, let me know how that setup process works. Ensure that the secondary linkage is completely closed (both visually and manually.). Comp. Should I just disable idle timing control? IAC Testing Procedure for EFI Systems I have a Holley Sniper EFI with HyperSpark ignition. Thanks for your very detailed question! Repeat until that stumble goes away, and then try a bit more throttle. I hope everyone enjoys this v. Once it commands that high idle I haven't found anything to return it to normal, other than shutting it down and restarting. It is a common one. It could be, but that seems unlikely.Instead, you need to look at the basics. I installed the Sniper on my 1978 Ford F-100 with a small block The only other thing I changed was accel enrich but whatever way I go doesn't seem to change anything unless I change it drastically. RPM = 1200My slow gear I leave with 650 RPM, the IAC Position I leave between 5 and 6%, the :-DStill, I hate to leave someone hanging so I'll try to help. Note too that the larger the throttle stab, the more brief the time in that cell and the more gradual the change.Here's what I recommend: Get somewhere where you can repeatedly stop and go. The problem I experience is that after driving for about 10-15 minutes, the car starts idle to high. As soon as I got the new one installed and wiredit fired right up and did everything it was suppose to do with no issues. The IAC going to 30 is normal. If you see that the ECU is commanding the IAC to 0 but there is air entering the IAC port then it's time to refer to my article on IAC Testing Procedures, Hello,I installed my sniper system on a 65 mustang, with a 302. I will let you know what the results are. I can adjust at 160deg, but my fans turn on at 180deg. Do I need to try taping up the IAC port and setting the idle off the idle screw? A question I cannot get a 100% answer on is can you piggy back off the Sniper EFI TPS for an electronic transmission? Confirm the placement of all wiring, ensure that the WBO2 sensor is positioned properly, etc. Engine warms up to 195 degrees and stays. Once you confirm the operation of your IAC then it's time to read my article on Solving RFI Problems. 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. nothing stays steady. Tried that and it didn't work? You advise would be greatly appreciated. However, I did have another fellow who contacted me that claims he went through three units before he could get one that would talk between the ECU and the Monitor. Holley - 543-105 EFI Idle Air Control Motor , Black - amazon.com I think you'll be all set! Copyright 2022 Holley Performance Products, Inc. All right reserved. At 0% it shouldn't be sucking any air through that port, correct? Glad to hear that you have timing control enabled, Gary. In this short video you learn to replace the IAC. The 10 step set up on your page set my idle perfect and iac perfect a very consitant 700. You just need to go back through the IAC adjustment procedure now that idle timing control is enabled. Not to bandstand here but this is the point when where you bought your system is so important. I have it set at 650 and it idles anywhere from 590 to 700. started up the engine. That's a nice change of pace--a low idle issue! When I shut it off then start it Does that make sense to you? If Now that you've installed at least four Snipers it is going to be imperative that you learn to create and read datalogs. Simply go to those cells, tweak them up or down as required, and the ECU should now be able to learn its way around the bog. This is extremely unreliable afrer warm. 680-700.I can't find any reason other than it looses where it is in the firmware with Shutoff engine wait 30 seconds, turn key wait for display to come up, start engine. I am extremely suspect of what you were told about the Sniper ECU monitoring fuel pressure, for several reasons. Solution #1 Put car in gear take off and the engine runs GREAT, no issues drive for 10minutes take car out of gear and engine idles correctly IAC between 2 and 5 Solution #2 Shutoff engine wait 30 seconds, turn key wait for display to come up, start engine. Any idea's? Holley will take a look and tell you you have RFI and wish you good luck in finding it. Engine has never stalled with Sniper system, once placed in Drive it just goes!!! Simply use your handheld controller and go to the Tuning > Advanced > Advanced Idle > Idle Speed screen and click on the Idle Speed Curve function. What can I do? Cheers Darren. 400 engine, C6 3 speed automatic, with standard canister coil for ignition, and 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. Advanced throttle body injection systems capable of transmission control and more. Initial thought is timing but Im running a cd box and the ecu is not controlling and I did not physically change it during the install. This will let you know at a glance if something is going awry with the fuel pump. Going in the direction you did (higher) is going to reduce the acceleration fueling that the engine sees. What I would recommend is getting somewhere that you can spend a significant amount of time doing starts. I believe because the TPS is not registering. I looking for your expert opinion. is jumping all over the place when you experience this condition, it does not When this occurs, I sometimes can shut it down and it will return to the correct settiings. The engine runs beautifully, with perfect idle at 650 RPM, but every now and then I hear the IAC give a sort of "snap" and the idle is at 1200 RPM. Get On The List for Emails Straight From Our Pro? Get that thing installed and you're going to know a whole lot more about what's going on. However, I can't think of a single one that was because of low vacuum. All times are GMT-6. So what--you're never going to drive in minus 40 degrees, right? Without it you are working in the dark. )Take a look at your AFR during the starting process. We will definitely be sticking with Holley from here on out for future retro-fits. May God's grace bless you in the Lord Jesus Christ. I have installed my Sniper and the car runs great. The fuel pressure regulator in the Sniper is fairly simple and not prone to failure, as far as I know. Strangely, what I've seen is that it idles too lean as the injectors are effectively shut off.Thanks again for the follow-up and glad to hear that everything is working well now. Using a Snap-on variable timing light so this is why I say timing is perfect. And, while that is happening, make a note of the temperature before you engage the starter, and then the rpm when it starts.The Idle Parked Position is set on a temperature-based graph like the Idle Speed Curve. and when I close the IAC's hole with his finger, the engine is normal.The data on the touch screen I see are:AFR, A / F = 35.6 The engine has 14: 1 compression ratio, we can not use gasoline. Holley Sniper EFI Problems: Best Fixes According to Manufacturer But if you can datalog the bog you can know much more precisely what is happening. Ive played with the timing on this thing multiple times.Car was fullly restored last year. Chris, A problem since day 1 - YouTube Leave a comment if you've had this issue and how you resolved. We are using Target AFR of 9.0: 1, Fuel Base approximately 40% higher. This page was generated at 12:25 AM. https://www.gmperformancemotor.com/parts/19210007.html, http://forums.holley.com/showthread.3128#post83128, If this is your first visit, be sure to When I am coming to a stop, the rpms will hang at 1200-1500 rpms. Intermittent stalling usually points to radio frequency or electro-magnetic intereference (RFI/EMI). Copyright 2022 Holley Performance Products, Inc. All right reserved. While it is not mandatory, I recommend the Sniper EFI CAN-to-USB Adapter to move the data between your Sniper EFI and your PC rather than trying to do this via the SD card. check out the. If no air is passing (and the idle doesn't drop) then your IAC is working. I would not expect that an electric fan would create a noticeable load on the engine but if it did then you'd want to set the idle screw when the fan was not running. I would suggest at that point you need to contact whoever is providing your tech support and find out why the default values are not working for you. Ensure all your sensors are displaying proper values. Of the two options, I generally recommend the self-learn. Chris, I recently installed my Sniper and have an intermittent idle problem. Holley Sniper IAC Problem 04-26-2018, 11:30 AM Hello. your IAC is at zero. Be sure to re-enable it once you get your idle tuned. Purists will sniff that these are not accurate to the tenth of a PSI. technical rep said "You ahve high fuel pressure". Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. When you first posted this I had no idea how to respond. The noise changes sound with the throttle position. I have a 406SBC that does most everything right with this sniper setup. you have it set. My primary reason for going EFI was drive-ability, (Startup and take off without waiting for the engine to warm up) and not have the occasional hesitation a carburetor has especially just barely opening the secondaries. I'll have to check again tomorrow. I also noted that after some time, I could change those values as I saw fit. Free ground shipping regardless of order size! As I would slow down for a stop sign or stop light, the car would run really rough and the idle did not want to come down. Idle quality is great, RPM is good, sometimes IAC is now between 2 and 5 exactly where it should be. Do you have a PCV on the engine? When I first told him to check for leaks he looked back there and said "all good". I was looking at a data log from my truck earlier this week and noted that at idle my IAC was zero. Relatively new Sniper EFI install on a '69 Mustang 302. I'm also having a high idle problem but its different. I have probably 200 - 300 miles on this engine and it has always done this. Should i adjust idle screw with the fans already on? And yes, monitoring the fuel pressure is the right answer. is train the system or there is actually something wrong.I do love the system at Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Target AFR at idle is 13.8%. I have a Holley Sniper for almost 11 month now and it was running fine with no problems until now. Tuning Your Sniper EFI System for Progressive Secondary Link Use $107.95. I have seen a couple of videos on you tube of the same issue but they don't seem to have found the cure.I hope it is not a computer problem as I have already replaced the entire system because of another problem. That is what I really respect about Holley. Have you confirmed your fuel pressure at idle is 60 PSI? Hello Chris. any ideas? I installed a Holley Sniper on my Ford Maverick 302 V8. no timing control. One of the most common symptoms of a Holley Sniper EFI problem is an air/fuel mixture that's too rich or too lean. Definitely not 90. It's called tuning. Does this seem reasonable and how hard will it be to get the idle and off-idle performance correct? The headache is the Acceleration Enrichment. I have never seen issue when CTS is below 120 degrees. *Possible delays due to Covid-19 click for more information. I would recommend that you call first thing in the morning, as they tend to get quite busy during the day and wait times can get long. Then follow all of the instructions above, including confirming the idle speed curve setting at -40 degress as well as following my 10-step process for setting the idle. All EFI systems need a large fuel filter to trap dirt and yet not reduce volume. The answer will divide the possible sources of additional air into two, greatly simplifying the problem.If the IAC number has not increased, then review the article above regarding high idle from a vacuum leak or high idle from sticking linkage. NOTE: Do not attempt to set the target idle speed and IAC position until the engine is above 160F! If you go the other way then you might find that the IAC zero's out when the fans are off. This item: Holley - 543-105 EFI Idle Air Control Motor , Black $71.72 Holley Sniper EFI 870001 Throttle Position Sensor $34.60 Holley 860004-1 92MM Sniper Throttle BDY $223.93 Customers who viewed this item also viewed Page 1 of 1 Start over Holley EFI Idle Air Control (Iac) Valve Motor 30 13 offers from $79.56 Since the load is more of a wave that increases the most initially and then decreases again, the ECU is doing really well to get the idle under control in only two or three over/under shots as you describe.You don't mention if you have your Sniper ECU controlling timing. If you find that the IAC is more than 8 percent, repeat this process and instead of shooting for 50 RPM below your target make it only 40 RPM below the target idle speed. I watched the butterflies start to open at about 35 on TPS. After 50 on the throttle position I'm not sure if the whistle goes away or you just can't here it anymore. You can adjust this number up or down but there is really no need to change it unless the car is stalling.The sucking sound is just what happens when the Sniper EFI System is paired with certain intake manifolds. idles good, runs amazing. I put it in neutral and the idle RPM had increased to 2100-2200. Thanks in advance for any advice. 2. Idle Tuning is a very important part of tuning any EFI system, especially our self-learning units like Sniper or Terminator X EFI. I will turn it up some. If you're having issues with your Holley Sniper IAC getting stuck at 20, there are a few things you can try to fix the problem. have the system learn the higher speeds? Have you checked your fuel filter and made sure it's not plugged?If both of these are okay you're going to have to find a way to monitor your fuel pressure while under load. The only way to do this is by installing a mechanical fuel pressure gauge. Holley Idle Air Control Motor Idle Air Control Motor Fits the Following Applications: Sniper EFI 90 mm, 92 mm, 102 mm Throttle Bodies Digital Pro-Jection Systems Avenger 4-bbl TBI Commander 950 Terminator TBI One additional wrap on the secondary coiled shaft spring is all that's necessary. So the issue Im having is low idle. Im thinking a faulty TPS. You'll be amazed at how much of this just "goes away" when you drive it enough. Consider adding fuel in the AE vs TPS and/or AE vs MAP ROC tables in the area where the stumble is occuring.Since this is happening at such low TPS levels it is possible that your engine would prefer a lower (richer) target AFR number at idle. When I turn the key on I can hear it prime, but I don't think im getting enough fuel. This is a mighty big subject for a blog post reply, I should probably start doing some videos on this. The person I bought it from said he never could get it to run for more than a few seconds. After much diagnosis, I ended up replacing the intake manifold gaskets. That, on top of your air leak, is allowing the engine to idle at 2400 RPM. I have one customer who is having some similar issues and his AFR is down at 9.6:1 when it won't start. Put a strong piece of tape over the IAC breather hole--duct tape or something that couldn't possibly be sucked into the throttle body. You've got it running and warmed up but now you need to set. Could be a bad IAC motor, replace it and see if that solves the problem. If the connection is loose it will cause the system to shut fuel off because the signal telling the EFI the motor is turning stops (to prevent excess fuel from being dumped in the motor). It reads 0 at idle and when I accelerate it goes up to 30 and makes a loud sucking sound that seems to be holding the car back. Doesn't want to start, runs like crap. Now I have most of the bugs worked out it runs fine on the highway and around town it's just the idle. During cruising at 30 miles and release the gas pedal the engine revs at aproximaly 1500 RPM and it won't drop. When I start the motor I have to push on the accelerator pedal for the motor to start. Initial Baseline Idle Speed Screw Setting, http://forums.holley.com/showthread.neral-IAC-Info, http://documents.holley.com/199r11031r.pdf, https://forums.holley.com/showthread-Idle-Solution, If this is your first visit, be sure to As I said above, you could have a bad IAC, but then again, the IAC might be fine and there's a deeper problem such as RFI noise causing the issue or a vacuum leak that is confusing things. Just thought I'd ask as there isn't a lot of info out there. If you complete the process and find that the IAC is less than 2% at idle, repeat the process and use the set screw to make the RPM about 60 RPM below the target. 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. Thanks for sharing that, Jason--great info! Tuning > Advanced > Adv Idle > IAC Startup He is able to get it to start by quickly depressing the accelerator to at least 60% and releasing. Plus, you can email that file to me and I can be of more help. Both answers you've received greatly oversimplify the truth in favor of the answerer. I appreciate everything you are saying. The team at EFI pro are some of the best I have ever dealt with when coming to ordering parts or having the knowledge to answer any question you may have. Sniper EFI Tuning & Tech. Your second problem should be a bit more concerning. Realize that when you drop the throttle, the engine enters a condition it will only see for a fraction of a second at a time. If i set the idle to 750, the only way i can get it there is to turn the idle screw all the way out but then its at 0 iac. Sniper EFI Initial Startup and Troubleshooting - Holley Drop the IAC parked position a bit at each temperature point and sort of back into the solution. TPS 0. The car cruises fine, and if I was to keep idle at 2000rpm the issue wont happen, its only when the car tries to ramp down to idle position.Thank you for your help, any advice would be appreciated.Thank you,Eric, Whenever we see the AFR go to "Heating" that is an indication that the ECU has been reset. I went on the good ole interweb and found your website which was VERY helpful! That will at least tell you something. Then a little faster--until bogs at that level work themselves out. These aren't generic newsletters either but instead personalized emails. It's all part of the pleasure of EFI. Im in Australia, so stuck the sniper on a 355 Holden engine with CD box. I started with right after I first adjusted for 2% IAC and took pics about every 30 seconds over about 2 minutes. That 60% (which is configurable) is known as the Clear Flood TPS. Data logs show no EMI/RFI. Hi Chris I didn't get any traction on Holley.com I've made all the adjustments, all the settings, and the IAC issue is driving me crazy. :-). I've read that a spacer with 4 individual holes will solve this, but after I installed the progressive linkage the noise went away!! Your closed loop compensation is adding a full 50% fuel. No problems with either cold or hot starts. Software: Idle > IAC Settings > Idle Spark, Handheld: Tuning > Advanced > Advanced Idle > Idle Spark, After completing this 10-step process, if the temperature displayed on the handheld is still above 160 degrees the engine should go right to it's target. Others might require 60 RPM. The car would idle, I could hit the gas rev the car up and it ran great I also noticed two nice black spots on my garage floor from the exhaust. Your suggestion to remove the PCV valve is just for diagnosis purposes, right? AGAIN This is Intermittent meaning on a recent trip I stopped 3 times and issued occurred once. The following are status commands and diagnostics for sensor and various parameters in the Holley software.

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