Hello, I have been wondering if anyone else has had any issues with the P12 PCM just deciding to do whatever it wants and not go down to the rpm set in the tune?
I have been able to set it to 900 and it will idle there but it will always run 848 if I set it below. If I manually override in vcm scanner the car will go to whatever number I set down to 600 without issues.
My car is a 2004 ion redline.
My friends 2007 cobalt ss doesn't seem to have this issue.
Might be your Idle Airflow tables.
If you post up a log and tune file, might be able to get a bit more help.
Idle air flow tables are not available in the p12 ecm.Originally Posted by Mark@TuckerPerformance
Whats the timing doing at idle?
Mods?
The most hated, make the most power.
93 Ranger. 5.3 D1X. 1069hp.
Sorry, was not specific enough. I was just referring to the Tab called Idle>Airflow.
Idle Airflow Tab.png
Was looking to see if he had changed the ETC Area Scalar for any reasons. And to find out what mods he had.
manipulation of the throttle body is not needed at this time as it is most likely something simple.
The most hated, make the most power.
93 Ranger. 5.3 D1X. 1069hp.
Sorry for the late response
My timing at idle is interesting, the PCM sometimes likes to hold a high tps when coming to a stop and it will hover between 0 and -5 with the AC on, about 10-12% TPS, and rpms will hover around 895rpm. However if I give it the tiniest tap on the pedal it will settle to about 8-10% and idle around 5-12deg of timing.
With ac off the TPS after driving is around 6-7%, and timing is between 0 and 5. That same little throttle tap drops it to 4-6%TPS and timing of 8-15deg approx.
The "Idle desired RPM" pid displays 872 with AC on, and 848 with AC off.
Yes my etc scalar is 3350 because at 2950 it would idle bounce like crazy. My min and max settings are set to stock 0 and 150, as is my friends cobalt that isnt having the same issues. Both cars have the same injector data and the lower MAF cells are within 1% of each other.
My mods are 3in exhaust, K&N cold air intake, 60lbs injectors, 50% E85, 50% Gasoline, 2.7in pulley
Here is my latest tune attached
LATEST.hpt
In this version I have the idle set back to 850.
Last edited by eronq9; 07-20-2016 at 08:31 PM.
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