Originally Posted by
EagleMark
Never heard pulling EST pigtail? You mean timing disconnect wire? That would be a bad idea to try and set min air at 0 timing, then add 15 degrees? I don't think so...
Just give the bin a shot, when totally warmed up and driven then let it idle and see where the IAC counts are. 20 to 40 your done. 0 and you got to close the throttle plates, over 40 got to open them. There's the GM set procedure of crossing A and B of ALDL to drive IAC closed, discconnect IAC, start engine and set to 100 RPM below desired CL idle, reconnect IAC then the problem is you have to claer codes and you loose your BLM learn, so you don't know if you got it right till you drive a half hour?. I've found it easier to close or open 1/4 turn, turn engine off for 30 seconds, start let idle, rev engine to like 1500 for 30 seconds and check IAC counts for next minute. Way quicker.
Have you checked and or replaced the vacuum line from back of TBI to MAP? Thick vacuum line, or the stock hard line that will not collapse!
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