In the warm state IAC adjusted to a position of 2 to 10%. May God's grace bless you in the Lord Jesus Christ. Thanks for any help. I put it in neutral and the idle RPM had increased to 2100-2200. When this occurs, I sometimes can shut it down and it will return to the correct settiings. Bryan McTaggart 02/28/2023 news I followed the instructions and set the IAC to 2-9% when warm with idle at 850 RPM. I very pleased with the performance, it is a huge improvement from the 800CFM carb I had on this motor. Going back to what you said. Are these compatible enough? If the TPS is 1% or below then the ECU is in control--2% or greater and the ECU thinks you've got it under control. When I start the motor I have to push on the accelerator pedal for the motor to start. Some suggestions: i did have the same problem.try lengthening the lever of the throttle.meaning the length from the center of the throttle to the point where you attach your cable or your rod from the peddle. That is what I really respect about Holley. A couple of possibilities that come to mind in order of likelihood: Im having an issue with what I think is the Iac. Plus, you can email that file to me and I can be of more help. I have checked the pink wire and it is at .001 volts when key is off. So I have been doing the slow take offs and thinking that it would learn its way out. It will still change a bit with weather changes and when you get into infrequently-used sections of the map, but it's nothing to worry about.Regarding your idle speed immediately after start-up, that is determined by your Idle Parked Position. Hello Chris. Your task will be to find that. If your TPS is at zero and your IAC is at some random number above 8% (but not exactly 30%) then for some reason your engine has not met the conditions to ramp down to target idle. Did you find this enlightening? When I turn the key on I can hear it prime, but I don't think im getting enough fuel. Properly configured, the Sniper does a fantastic job of responding to the transition from Park to Drive. That's what you're seeing. that my Air/Fuel ration was 15:1 and I believe the target is 13.5:1. Let I figured out I was going the wrong direction when I was messing with the AFR programming. Laptop Access The problem I'm having is I cant get the IAC to drop down off 100%. It has a lightweight centrifugal spring kit installed so I reach total timing around 2500 rpm. Any suggestions would be appreciated. The biggest issue is these problems are intermittent meaning they do not occur all the time. 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. And your question is very perceptive: You must first know whether the bog is a lean or a rich condition before you can make the correct adjustments. SNIPER EFI TO HOLLEY DUAL SYNC HARNESS Part# 558-493 $34.44 Qty: Add To Cart Idle Air Control Motor 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 Part# 543-105 $71.72 Qty: Add To Cart Cracked casing from a side cover screw being installed crossed threaded. 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. idles good, runs amazing. I can get it to fire up on the Yes, let me know how that setup process works. Took it for a lap around the block and came back. I had this same exact issue. Your suggestion to remove the PCV valve is just for diagnosis purposes, right? Reply Quote. datsun sniper efi Holley RetroBright This 1974 Datsun 620 Bulletside Cruises With The Help Of Sniper EFI Bradley Iger 01/13/2023 features Latest News sweepstakes 2023 Hemi Engine Sweepstakes Gen III Hemi Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! A few, however, get tangled up getting the idle control working just the way they want. Earl's Mechanical Fuel Pressure GaugeI could use that for a quick troubleshooting for 1/3rd the cost of the Holley one. The Sniper EFI Manal says not to but many EFI installers have informed me that the transmission only reads the 5V TPS signal from the Sniper EFI & does not draw any power so will not affect the Sniper EFI TPS output. If there's any run time on your current setup the Sniper may have some bad learn data due to what appears to be timing issues. Thanks. I received from the controller manufacturer greatly understates (at best) the repeated failures of others I know personally who have tried and failed. first attempt but as it tries to idle down to the target RPMsit can never even If you did not rotate the distributor to set the actual timing to 15 that might be the only issue. I also noted that after some time, I could change those values as I saw fit. Thanks for the information you have provided on this site. It would be possible to set up a 1D or 2D table and do something like this, so if you've gotten into these advanced setups then that would be another thing to check.If neither of these work then I'd recommend that you do a data log of the engine idling as the temperature is reaching and then exceeding 200 degrees. I have verified that there are no vacuum leaks, not to mention the car runs to good to have a vacuum leak bad enough to make this noise. me know how it works for you. i would have been happy to answer there. What is it supppse to be at idle and while driving under heavy acceleration? Jun 12, 2021. I have tried your 10-step idle adjust and ive adjusted the idle curve. I would continue checking the electrical connections along the fuel supply. Eventually the IAC will drop back to zero, I'll readjust it to 850 RPM & 2-9%, and then watch it steadily climb again. Thank you chris for for getting back to me on this matter.I'm using russell hi pressure gas line to feed the gas up to the sniper and using the stock steel gas line that use to be the feed line for the carb to return the gas to the tank. During after-start idle, the idle will jump up to about 70% if the engine is cold, stay there about 4 seconds and then ramp down to the target idle speed for the current engine temperature. No air should be able to pass. In fact, it is those users who seem to end up most impressed with the system. My dad wanted to recheck the timing so I set the Static Timing at 15 and it runs perfect. What an amazing site you have here. With everything else being right and since you can make it start by adding fuel it seems like you must have some sort of fuel pressure issue. Super helpful and knowledgeable. When I see that your TPS is 1%, that tells me that you may have an RFI problem. shut truck off. But I am having troubles.When stepping on the accelerator slightly with idling, it will be 2000 RPM all the time. With select intake manifolds, the distributor housing and IAC valve on the back of the Sniper EFI throttle body are fighting for the same . Or is there something else I should Thanks. It runs perfectly fine other wise. I installed my Sniper and the engine fired up great. When this happens, it is impossible to convince the Sniper ECU to allow the RPM to drop below a set RPM--regardless of what the target idle speed setting is. Thanks for all your help Chris! It could be a problem with the power/ground for the Sniper but much more commonly this is a result of too much RFI. Just thought I'd ask as there isn't a lot of info out there. And the rather cavalier "Absolutely!" Full product line and accessories at excellent pricing. It felt like it was flooding out at low speed, low. Your issues are likely related to one of these two things. How can I adjust the startup speed down to about 1400 RPM? I called support line he said he would have to look into it and call back. Technically it is a warranty-voiding maneuver so proceed at your own risk. The Super Sniper will allow you to monifor fuel pressure if you add an electronic sender but this is not an option with the standard Sniper. First, recognize that the IAC and the TPS are not inter-related in any way. Thank you so much for your follow-up. Will restart but only for a minute or so a couple of times then shuts down fuel delivery and will not restart. Second, Holley just released over the weekend a video on how to implement a flex fuel sensor on their HP and Dominator ECU's. So as much as I can I have been taking off real slow and let it fall on itself to try to learn and its not learning its way out of it. That, I am afraid, is going to involve a little bit of luck if you don't want to create a 250 MB data log. It will need to see it again and again. itself out and hold idleeventually stalling. My sniper is doing two thingsFirst issue, the idle is set at 800 and will idle fine, then There is a glitch in the system. It drops about 200rpm when clutch engages. Wish I had bought my sniper from you, but unfortunately didnt. My guess is a faulty IAC since it is intermittent and I have not done any setup changes. Shut off the engine, ensure power to the Sniper is switched off. The Sniper even has a feature that allows it to use the idle timing to control the idle speed. But they are 100% committed to your satisfaction. If the TPS is even just 2%, the IAC will go to the hold position (normally 30%) and will not change until the TPS goes back below 2%.If you create a datalog you will be better able to confirm if something is not working correctly. Even at 0% it's sucking a bunch of air through the IAC port. Was perfect idle iac reading 3. Then you can take a close look at the IAC and see if it is opening. I'm compltely stumped and my wife is certainly upset I'm spending so much time between the garage and the computer for something that should basically run out of the box. That is not the way to go. Then it changes and will not idle down, the handheld will display 0% IAC but you can see and feel that the IAC valve is more like 100%. Clearly, something is changing. First, check to make sure that the IAC is properly mounted and connected. As far as the timing light, I don't know, because I was having problems getting it to work, and that's where I stopped. 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). Sometimes it sounds like it wants to crank at the start but runs out of gas. When you have the issue you should disconnect all hoses and plug the ports on the Sniper. We're never going to fill up your email box with nonsense. Closed Loop Compensation rises to 100%, Do I just keep pushing it the same way to I recommend you have a look:https://www.efisystempro.com/efi-pro-hangout/holley-sniper-efi-instruction/solving-sniper-rfi-problems, I recently purchased your fixed linkage to open primaries first and the throttle linkage extender to also get a smoother pedal. That changes almost instantly as the engine revs.Since the learning algorithm requires some time exposure to a certain condition to make larger changes, that half-second makes only the smallest impact. :-)Yes, learn impacts idle too, and remember the even when the basic learning is done there will continue to be some learning for changes in weather, altitude, etc.Go ahead and try a few idle settings and see how they impact the idle-speed searching. And, hopefully, within those degrees you will find a place where you don't get the whistle. The hold position is part of the response that keeps the car from dying when you come off the throttle. We do that but most places don't. Which means you either need to increase that number or increase the ramp decay time. Holley Sniper EFI Troubleshooting Mudford Garage 8.6K subscribers 38K views 3 years ago My Bronco with Holley Sniper EFI was running poorly. New install, when in setup wizard TPS says 90 percent and I checked the linkage and butterflies. You're going to have to clean up the wiring in your engine compartment, In particular, look for spark plug wires that might be running near your throttle position sensor. The TPS will go red with a -15 and the AFR reads heating for a split second, then the idle kicks up to 2000RPM. The fix? We have never had that problem with any of the units that we have shipped. !I called Holley today, and before I could even described the symptoms the 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. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. I have driven car about 200 miles. Could the IAC be broken/malfunctioning? Sniper EFI Problems - Holley Performance Products Forums Thanks Again for your help. Good I've made all the adjustments, all the settings, and the IAC issue is driving me crazy. Im not sure what its doing, have messed with after start fuel, fuel at cranking. 63 bomb Rpm with 4-8 iac but it still shows red and shuts off randomly at idle and it won't even drive 2 miles without shutting off. I straightened that out, got it running and that's where it goes downhill. Have you ever experienced a high idle once the engine reaches 200 degrees?Ive set my idle the way you said and it works great until the engine reaches 200 degrees. Take it a step at a time. The tps will not auto reset to zero. Worst case you'll have a spare on hand, and if the TPS is faulty you will have solved the mystery. 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. >I'm using russell hi pressure gas line to feed the gas up to the sniper and using the stock steel gas line that use to be the feed line for the carb to return the gas to the tank. Has a good size camshaft cant find any vacuum leaks. 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
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