What would I need to adjust to correct the idle from going up to 1500rpm at low speed before coming to a stop. Once the car stops the idle returns to normal. I was able to get the car to idle fine at startup. I stuck to the instructions on idle in the stickies and I drilled the TB blade. The car is a m6 with ms4 cam. thanks
Last edited by TonyLSX; 11-03-2008 at 10:37 PM.
I had this problem in one of my cars a while back It had a 23x 23x cam and also had the tb blade drilled. the car was tuned by a reputable tuner so I don't feel too dumb asking this, and I'm hoping its a common problem and easy fix. Thanks again.
Post a copy of your tune, sounds like base running air flow needs to be scaled back.
Is it better or worse when the engine is at operating temp?
LS2 Alloy Block 402 - VORTECH V7 Gilmer driven 15 psi 937.3 rwhp street driven.
If it was the idle airflow, the LTIT should compensate for it or it would idle high all the time. I would put my money on the throttle cracker, but if the idle airflow is WAY off, that is also a likely culprit.
Sulski Performance Tuning
2000 WS6 M6 - LS6 (long block, refreshed top end), 10.8:1 CR, 90 mm ported FAST, Exo-Skel, 227/232 cam, QTP HVMC, EWP, GMMG, 9" w/4.11s
2018 Sierra SLT 5.3L A8 - Airaid intake tube, GM Borla catback, L86 Intake/Ported TB
My car does the same thing when I romp it and then come to a stop. The idle will just hang at 1500rpm like the blade is stuck open. If I kick the throttle it fixes itself. I tried shutting the throttle cracker off but my car would constantly die when decelerating from high speed(aka 40mph).
2012 Chevy Cruze A6 1LT RS
Formerly - 2004 GTO, 2002 Z28, 2007 Colorado, 2008 Silverado
then you just lower it
Sulski Performance Tuning
2000 WS6 M6 - LS6 (long block, refreshed top end), 10.8:1 CR, 90 mm ported FAST, Exo-Skel, 227/232 cam, QTP HVMC, EWP, GMMG, 9" w/4.11s
2018 Sierra SLT 5.3L A8 - Airaid intake tube, GM Borla catback, L86 Intake/Ported TB
If "kicking" the throttle helps, then you have a cable
that's too snug, a blade that's off-center or something
dumb like carpet interfering with the pedal. But if this
kind of thing is the problem then it won't trim in like
the original post describes. That is the sum of the
base airflow plus cracker plus any other stuff like the
accessory torque that pushes airflow adders (or in
the case of a modded motor, that the torque model
at low RPM has slid further into bogus).
Pardon my ignorance.
Was logging IAC this morning and noticed as I gave the car throttle, the IAC would open more and more. Is this the throttle cracker in action?
2012 Chevy Cruze A6 1LT RS
Formerly - 2004 GTO, 2002 Z28, 2007 Colorado, 2008 Silverado
mainly throttle follower as the depends on TPS%
Sulski Performance Tuning
2000 WS6 M6 - LS6 (long block, refreshed top end), 10.8:1 CR, 90 mm ported FAST, Exo-Skel, 227/232 cam, QTP HVMC, EWP, GMMG, 9" w/4.11s
2018 Sierra SLT 5.3L A8 - Airaid intake tube, GM Borla catback, L86 Intake/Ported TB
Sorry I havn't given an update on the fix yet. The owner of the car is sick and hasn't called me to have me look at it. My thought was also the throttle cracker, Hopefully I can adjust it and test soon. I'll keep you guys updated on the fix. Thanks again
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