Idle : IAC Rampdown : IAC hold positionChange this by maybe 2% in either direction. Im in Australia, so stuck the sniper on a 355 Holden engine with CD box. On a cold start it will idle at 750 everytime, But if its hot start it will jump upto 1600rpm for 2 seconds then come back to 750. 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. Common killers: No filter in front of the pump, reverse wiring, driving with PWM voltage, running at dead-head pressure.Since it sounds like your pressure is right, and since the Holley system doesn't provide a PWM voltage, that pretty much rules out everything but the lack of a filter. 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. You're going to have to get this fixed or it's going to cause even more problems than the high idle. Good afternoon Chris, thanks for taking the time to help all of these folks that didn't purchase from you- myself included!The issue I seem to be having is at idle in both park/neutral and drive. Due to when the pump i'm using now makes a loud howling noise when it gets ran for awhile and it gets at a 1/4 tank of fuel or less. Give them a call and if they are unable to provide customer support the contact the Holley tech support line at 1-866-464-6553. I have a Holley Sniper for almost 11 month now and it was running fine with no problems until now. Find a lower price anywhere and we'll beat it by 5%! But if you will just advance the timing at idle and see if it makes a difference then that will tell you what you need to know. When I put it in park the idle RPM was 2100-2200 each time. Also ensure the TPS Position returns to zero at idle, & the IAC Hold Position isn't setup too high. Can the return line be an issue?I have had 2 faulty gpa-4 255 walbro pumps go bad. check, I guess after reading everyone saying how great the system is after The link above includes the option to buy a -6 AN Holley have given a new unit. Yes, you are correct. At 0% it shouldn't be sucking any air through that port, correct? The Fuel Base map is perfect, the car works well, runs well, running through the streets, the car is great. Turning it off and back on would reset it, and then it would work as advertised for a while. Stupid question, but where do I see if it's entering Learn mode? Sniper EFI Initial Startup and Troubleshooting - Holley That could be a problem with the TPS or it could be some sort of throttle linkage issue. If the IAC is zero, and if putting your finger over the IAC port doesn't lower it, then it's not the IAC circuit. Holley Motor Life First, recognize that the IAC and the TPS are not inter-related in any way. Thanks for all your help Chris! That's what you're seeing. 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. 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. other things that might cause the idle to faulter, but this is a good start. NOTE: Do not attempt to set the target idle speed and IAC position until the engine is above 160F! Are these compatible enough? (Grease can sometimes do the same thing as a more permanent gasket sealer without making the removal of the air cleaner such a pain.). 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! Should the iac% fluctuate? By the way your site and your accessory products are nice. If the vendor from whom you bought the system is coming up blank on ideas then don't hesitate to contact Holley's outstanding tech support department directly at 866-464-6553. If there is an issue with using the Sniper EFI TPS signal, is there a remote TPS or an adaptor for the Sniper EFI that allows the TPS signal to be accessed for the transmission. Resistance results in heat and heat results in more resistance. We're having trouble with a Ford Maverick 302 V8, using ethanol. If you are using your Sniper EFI System to control timing, navigate to Tuning > Advanced > Advanced Idle > Idle Spark and ensure that the Idle Spark Enabled is set to Disabled. Did you find this enlightening? What I would recommend is getting somewhere that you can spend a significant amount of time doing starts. When the system is up and running the fuel pressure regulator inside the Sniper is making a rattling sound like a shaking a paint can. If your fuel pressure regulator has failed (and they often fail by blocking return fuel and maxing your fuel pressure) then it could lead to rich idle, particularly until your engine gets up to temp. Well, it turns out that with the current firmware this throws the IAC control into a bit of confusion. Okay, try my method. 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. I tried adjusting my IAC up to 10deg in both directions with no change. It could be that you've left a vacuum port unplugged, it could be that the throttle plates are misaligned (unlikely), it could be that your IAC is not closing properly. I'm Having trouble with the Sniper on high Idle. Both Sniper and trans controller grounds were direct to the battery ground, as they should be. Then, when you experience the high idle, note if the IAC number has increased. No air should be able to pass. This is extremely unreliable afrer warm. Purists will sniff that these are not accurate to the tenth of a PSI. when things aren't working and this provides just that. Cycled the ignition off. And since they really had an insanely-tight monetary and real estate budget in the Sniper EFI System, it is unlikely that the added something that wasn't absolutely necessary--and then forgot to use it..And you are spot on about the little Earl's gauge with optional -6 AN port. Thanks for the information you have provided on this site. Holly offers a very nice Analog-Style Fuel Pressure Gauge that is another option. As you see above, the Sniper is going to dump in a maximum amount of fuel at zero TPS, begins to remove acceleration enrichment at 60 percent TPS, and then removes all acceleration enrichment correction at 100% TPS. While confirming, in the handheld ensure that the Reference Angle is set to 57.5 and that the Inductive Delay is set to 100. Commanding the engine to automatically increase speed when switching into drive is a little scary to me though. I can adjust at 160deg, but my fans turn on at 180deg. I installed my Sniper and the engine fired up great. My IAC was constantly at 100% at idle. That is certainly not normal! Be aware that there is a spring behind there and a diaphragm that you don't want to tear. I've not heard of any others with this exact issue so I don't think it is a common problem. When this occurs, I sometimes can shut it down and it will return to the correct settiings. Note that Brazilian gasoline has 27% ethyl alcohol. I have been able to get it pretty Sniper EFI Tuning & Tech. I'm so glad you found this helpful--that makes my day!Don't get too concerned about the specific learn percentage. Since that has long been corrected we have moved that information to the bottom of the article.). After 50 on the throttle position I'm not sure if the whistle goes away or you just can't here it anymore. EFI Systems based on Holley's world-class Dominator and HP ECU's. Holley Sniper IAC Problem - Holley Performance Products Forums Glad to hear that you have timing control enabled, Gary. The engine has 14: 1 compression ratio, we can not use gasoline. You've got it running and warmed up but now you need to set. Installed sniper on 65 galaxie. By going into the IAC settings and turning off the Idle Spark control and setting Target Idle to 750 RPM my idle issues are gone, and it now returns to desired idle after cruise. Fought a high idle issue until I changed your idle speed curve fix along with dropping the IAC hold to 10%. Enjoy! So check that timing and I think that you're going to find you need a good bit of advance. You will find a startup IAC percentage, an amount of time it holds at that percentage, and an amount of time it takes to idle down to the normal idle speed.By default, that number is 50% at normal operating temperature. To do this, open up the Initial Startup gauge screen that was used in section 17.0. Thanks, That is an strange situation. I would suspect something is coming loose causing a stop to the EFI system/Fuel flow. Once engine is warmed up been driving for awhile. And, hopefully, within those degrees you will find a place where you don't get the whistle. Take a drive and stop somewhere for 30 minutes, CTS is 170 when engine was shutoff. That is likely just confusing the issue.Instead, choose whichever setup most resembles your camshaft and stick with that. It is reliant on the data acquired by the included wideband oxygen sensor. If the issue persists, you may need to replace the IAC. But I wanted to go ahead and answer this so that it would make sense to someone who might not go that route.I think the first thing I'd do is try another pressure gauge. It's a Chevy 350 bored .030" over it has a cam in it what I was told is the cam has the firing order swapped. If I were there in person I would test the function of the IAC (see this article.) Member List; Calendar; Forum; Holley EFI; Sniper EFI; If this is your first visit, be sure to check out the FAQ by clicking the link above. such high fuel pressure. If your fuel pressure is at or about 60 PSI then visually inspect the barrels of the throttle body while having someone key on the Sniper. As I said I didn't buy from you so you don't owe me anything. It's hard to know what the previous owner did right versus wrong. That's not the IAC Hold Position, it's a percentage value. It didnt do this with the carb on it. you have it set. A few, however, get tangled up getting the idle control working just the way they want. Second--even in the HP and Dominator systems where a fuel pressure sensor can be dalogged and displayed, the fuel pressure is not fed back into the algorithm. A problem since day 1 - YouTube Leave a comment if you've had this issue and how you resolved. If you go the other way then you might find that the IAC zero's out when the fans are off. Plus, you can email that file to me and I can be of more help. Last night I tried setting the IAC and had the same problems after it's warmed up. The idle will not return to the set value.The second issue is the same as the first but the motor will stall out. Going lower with the blanking might pay dividends, but there is so little room below 7/8 that you will quickly be in a range where every tiny variation in the TPS or MAP is throwing extra fuel into the engine. The on board fuel pressure regulator in the Sniper throttle body has a small filter clipped over one end . At idle my IAC is 3-4, AFR around 13-14, TPS is 0, timing 15-17. Can the return line be an issue?So far this sounds like an ideal setup.>I have had 2 faulty gpa-4 255 walbro pumps go bad. But after sitting static idling for a little bit, the IAC goes to 100% & stays there. )If you rule out a fuel supply issue then we're going to have to gather a few more clues. Just add 5 or 10 degrees of advance and see if it doesn't idle better. Target AFR, A / F = 13.5 normal city driving, I no longer have other problems I had with the original Jun 12, 2021. Generally, one of two things: a stuck throttle or noise on the TPS signal. The learn percentage should gradually decrease to virtually nothing as the map plus learn table begin to get more and more accurate to your specific setup. May God's grace bless you in the Lord Jesus Christ. When I removed the tape and started it again, it was idling at 1400-1500 RPM and sucking a bunch of air through the IAC, even though it showed 0% on the sensors screen (pic attached). This value is itself enough to raise the idle a bit. Holley - 543-105 EFI Idle Air Control Motor , Black - amazon.com Thank you in advance for your help and providing us rookies with your carburetor setup, but it does blow when I can't jump on the highway like I use https://www.gmperformancemotor.com/parts/19210007.html, http://forums.holley.com/showthread.3128#post83128, If this is your first visit, be sure to Holley Sniper EFI 543-122 Sniper EFI Remote IAC Kit At some point you come upon problems that evade the easy answers and this is a good example. When you have the issue you should disconnect all hoses and plug the ports on the Sniper. Hey Chris! Take it a step at a time. When the lambda is 1.0, the displayed AFR is 14.7;1 REGARDLESS OF THE FUEL. The headache is the Acceleration Enrichment. If I go any more it will ping. Sometimes it sounds like it wants to crank at the start but runs out of gas. Keep in mind that at 60 miles the Give that a go and see if you don't make some progress! There are two ways to address this--you can let the system learn or you can manually adjust the acceleration enrichment. There is no real mystery here. What must remain foremost in your mind is that the only thing that can cause the idle to increase is additional air getting into the engine. Thank you so much for your follow-up. When I finished the install on my C10, I set it as follows: 13.1 at idle, 14.2 at cruise, and 12.9 at WOT. 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. The learn function will offset the base fuel table until the closed-loop compensation only requires minimal changes. Only show this user . Sniper EFI Idle Tuning. But, whether your vendor provides you with tech support or sends you to Holley, I'd start by getting them a data log and asking for some insight. :-). The Sniper will be controlling the timing so it will be based on a multitude of factors. Seems to behave more better now. If they are closed, check the primaries. I will turn it up some. mean that the IAC is causing it. The distributor was loose. Don't make any changes more than about 10% and keep the same basic shape as the original (High/flat below 20 degrees, sloped downward up to 180 degress, and then flat again above that.) I followed the instructions and set the IAC to 2-9% when warm with idle at 850 RPM. One of the signs of a vehicle with a rough idle is a faulty Idle Air Control (IAC) Motor. You are looking in the right area but I would probably not change the ROC blanking. Observing the temperature on the 3.5-inch handheld (only), wait for the temperature to achieve 160 degrees F. Once above 160 degrees, turn the idle speed screw so that the idle is about 50 RPM below your target idle speed set in step 1, above. Then you can take a close look at the IAC and see if it is opening. That is the only way to fly. Then do it just a bit faster--just enough for it to bog a bit. :-) Just don't let the parts go flying. I believe that you have this problem solved now with your new inline filter/regulator. THANK YOU for the "First--Check Your Idle Speed Curve Setting!" Going back to what you said. It will need to see it again and again. So the issue Im having is low idle. 90% of problems, (INCLUDING MYSELF) could be answered/fixed by just reading the instructions. I' m going to put the 3rd new pump this coming friday. Do you have any clue? Supports up to 650hp with Four 100 Lb/Hr Injectors! The Tech Tips and discussions are also great! After the start process, If the idle speed is higher than the target idle then the IAC should begin closing as long as the TPS is below 2%. idle counts from 0. It is simply for the benefit of the user. While you have over 200 miles on the system, you must realize that in the part of the map where the ECU finds itself during lanches you might only have a total of 5-10 seconds in any given cell. So I had my Idle set up perfect, with idle timing control off and engine hot the IAC was right at 2-4%. I have changed my roc/tps to 7 from 15 but that only took me out of learn mode. 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. Any help would b great. I have been reading these posts and have learned a lot. I installed the Holley gauge you suggested in another thread at the fuel input to the TBI, and the fuel pressure is constant around 64 according to the gauge. Has a good size camshaft cant find any vacuum leaks. close to idle with the IAC between 2% & 12%. Worst case you'll have a spare on hand, and if the TPS is faulty you will have solved the mystery. What I can't explain is why your TPS is acting so randomly. I think you will find that it will learn its way through this. Hello. Cracked casing from a side cover screw being installed crossed threaded. 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. I can get it to fire up on the 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. Ilike a few othersam having idle issues. The data that you provide shows that you have at least two problems. They also worked with me on a sale I missed and price matched those parts. If you go too high then the motor will not return to your target idle when you come off the throttle. If the ECU has not spent some significant time learning yet, I'd recommend going back through the setup wizard and getting everything back to default. I got it home, checked it all over, everything is hooked up correctly. Idle IAC problems? - Holley Performance Products Forums The Sniper resets the TPS to 0% each time that you key the system on. We offer some tips to help with that. If it is already adding fuel, it may be worth expanding this into the area where the tip-in is occuring (and where there is no learning occuring. Holley will take a look and tell you you have RFI and wish you good luck in finding it. Thanks for any info./insight you can provide, Mark. Holley EFI Electronic Fuel Pressure Gauge, article on choosing between Sniper and Terminator X throttle body solutions. A common issue we see is a result of poor fuel pump grounding running a eyelet from the pump ground to a rusty or painted surface. And your understanding of how the throttle position affects idle is exactly correct. Based on your situation above as well as some of other experiences, I recognized that I needed to improve my tuning procedures above to better explain what steps to take if that 10-step process doesn't completely solve the problem. The first thing I'd do is check your fuel pressure with a gauge like this. Switch power to the Sniper on and crank the engine. This question is really outside both the scope of what we try to discuss in the comments section as well as the overall subject of this article. If the regulator is working correctly and there is no restriction in the return line that should make no difference however.Sorry I didn't see this on the Holley forum. The only way to confirm RFI problems is by doing a data log. That disappears as soon as the throttle is pressed and then you immediately revert to your timing table.You can certainly use the compressor to initate the IAC Kick, but remember that this is just a temporary idle boost to ensure that the engine doesn't die when the AC is first turned on. Though it started and ran good, it was dumping fuel and would not lean out to AFR set points. 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 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. Hello Chris. Save Share. When I cover it with my hands, it gets quieter. Both answers you've received greatly oversimplify the truth in favor of the answerer. If the minus 40 degree setting is lower than the setting to the right, simply move it up so that it looks something like this: The folks who have tried this have found that their idle speed control behaves much more as they expect. Thanks again Chris, your help has been invaluable.If anyone is considering going EFI, Chris is the man to chat with. Getting the throttle blades and IAC to work together will keep your fuel injected hot rod running smooth and predictable. 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. Drives just fine but won't stay running unless I keep my foot on the gas. 680-700.I can't find any reason other than it looses where it is in the firmware with Contact whomever sold you your system or Holley directly. I would gladly engage with you to solve this but ultimately you are going to need to go through whomever you purchased the system if a warranty return is in order. This software is going to allow you to open both the configuration file and the datalogs that you create, overlay them and you can get a much better idea of what is happening.

Midheaven In Aries Celebrities, Jobs With Visa Sponsorship In Europe, Articles H