New converter, bad idle
02-10-2009, 11:24 AM
#1
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New converter, bad idle I've searched for longer than it took me to swap converters.
Everyones generous to give up solutions to just about anything related, like the missfire/lock up problems.
I cannot find any info on how to correct the idle with HP Tuners.
I've raised it, but when I back out of a parking spot and put it in drive it tries to stall, sometimes does.
The car is an '02 Z28 with mainly exhaust, built trans, and I tuned for all that.
Can anyone point me in the direction?
Everyones generous to give up solutions to just about anything related, like the missfire/lock up problems.
I cannot find any info on how to correct the idle with HP Tuners.
I've raised it, but when I back out of a parking spot and put it in drive it tries to stall, sometimes does.
The car is an '02 Z28 with mainly exhaust, built trans, and I tuned for all that.
Can anyone point me in the direction?
02-10-2009, 03:28 PM
#3
Yes, you are on the right track. The smaller weight of the converter is "confusing" the adaptive idle routines, which the ECM will over compensate for and possibly stall the engine on low speeds. You need to tune the idle as if you had installed a small cam. Log the idle trims and adjust the RAF table until you are at -.10lb/min on the STITs. Raising the idle rpm is a band-aid temp fix.
