HHR SS low power / boost until gas pedal is flicked
#21
Also, shoulda mentioned trying some racing fuel. Although hot carbon might still preignite the fuel, detonation is less likely.
#22
I checked for codes and there are none.
I pulled all the spark plugs and all are AC Delco Iridium 41-108 and the condition of all 4 looks good.
However the ignition coils are not AC Delco. They are Autozone Duralast. They have been in the car for about 20k miles
I set the RPD to Spark Advance and noted the following when the issue arises. Spark advance will be at about +20 when lack of power issue is occurring. But after the pedal flick and full power is instantly restored, the spark advance will be at about +5. The only time I will see a negative (-) spark advance is during the warm up after a cold start.
Any ideas or suggestions what to do next?
Rich
#25
#27
IDK how it works. I was fishing for someone with more experience with that system than I have. You could look into the price of a new part. But I don’t even know if it could be the sensor at the pedal or at the throttle body. I just think if flicking the throttle changes the behavior, then a mechanically sticking sensor is at least plausible. If no codes, I would lean toward the pedal sensor, cuz how’s the ECM supposed to know what yer foot is really doing?
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