Spark advance negative at idle, And the first mod most folks do to those is throttle remapping to allow them to do this. A little more insight to this problem. 5 degrees at idle and then drops to exactly 20 degrees at all engine rpm above idle. What I found was that at idle he is getting between negative 17 and 21 spark advance. The mixture doesn’t have enough time to fully burn, and some of the unburned fuel is expelled through the exhaust valve. Which is retard but the question Apr 20, 2019 · No power loss or rough just some very small hesitasion sometime. Typically if you see negative values the PCM is trying to get rid of torque. Nov 22, 2015 · In addition, the WSM says spark advance should be between 6 to 18 degrees BTDC at idle. It can cause problems like stalling, rough idling, and reduced engine power. Apr 30, 2009 · Well regarding negative advance, I suppose that since the ECU has not made the switch to go OL, it is still trying to run a CL stratified charge with ignition events occurring super late? But I don't really want momentary 15psi + 14:7@ 3k rpm with -5deg advance! Sounds like a recipe for det (well how could it det if its ATDC???) and busted pistons? Bot Verification Verifying that you are not a robot Jan 21, 2003 · I monitored several sensors and happened to notice that my spark advance runs 22. Ideally, spark advance should be set to balance power and fuel efficiency while maintaining acceptable emissions levels. 50 degree a couple of seconde, i can hear the exaust popping a little after a moment everything is perfect. You can accelerate the engine quickly; it takes a long time to come back to idle. With any throttle input it is pulling a ton of timing. I've cleaned the throttle body , tried disconnecting maf and lambda but no effect on the advance . This is usually a sign that you have a torque request vs actual problem. What I'm seeing is that at idle my spark advance seems to be bouncing around a lot, and even going negative sometimes. IF i go with the car right after start, something i have some hesitations my modifications: cobb sf intake Turbo inlet corksport hpfp autotech fmic corksport turboback catted. the problem is that at idle it shows -7 degress negative spark advance ; for some reason it's running rich and the ecu wants to "slow" the engine . In this article, we’ll explore the reasons behind the issue and offer some solutions to fix it. May 8, 2023 · If you’re experiencing Spark advance fluctuate at idle, it can be a sign of a more significant issue in your vehicle. Current idle rpm is 720. Jun 19, 2003 · I have the scan software from Alex Pepper and was checking out my friends 96 Camaro. I can't seem to figure out why all of a sudden it started doing this. Nov 27, 2025 · Too Little Spark Advance (Retarded Timing): Leads to reduced power, poor fuel economy, and increased exhaust temperatures. I happened to unplug the tps and the truck is drivable. Jun 11, 2023 · Adjusting spark advance at idle can be particularly challenging because of the low engine speed and cylinder pressures. I don't know much of your setup or what kind of vehicle but this is typically how that works. Aug 3, 2013 · My spark advance * fall in negative like 30sec, it is normal? -12. Looking for what should spark advance be at idle? Learn about distributor settings, factory recommendations, and performance tuning. This has happened on two separate occasions. I have attached a tune and log file. He had been getting very poor gas milage and I said I would check his O2's for him.
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