Quote:
Originally Posted by ChevyTech
Does it have hydra-boost or vacuum assist power brakes?
A torn diaphragm in the vacuum brake booster can move and leak at varying amounts each time the brake pedal is pushed so when you apply the brakes to put it in gear the leak is affected.
Did you take note of the IAC count at hot idle in Park? If so what was it.
Did you ever see the IAC count go to zero?
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Hydra boost. IAC a little high at 750rpms the counts are 35. Starts at 0 and works its way up. Noticed today on the scanner that when in gear the idle settles at 750 and the iac is at 145 counts. Back to park and the counts go down to around 128 counts and its idling at 1700rpms. Cycle the ignition and idle is back to 750 and 35 counts on iac.
What do you think I should set the base idle to? I've been getting many different answers. Some say 450 others say 125 below target others say 550. (can't find any info probably cause the don't want ya messing with it). not sure what the best base is to achieve a 30 iac count.(this is based off of gm specs for the 454) any suggestions?