TPITuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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"With the IAC pintle fully extended (closed) all idle air will be controlled by the position of the throttle plates. Some manuals indicate that the EST bypass connector should be disconnected for this procedure, while some make no mention of it. While timing is a factor in idle speed, the EST should only operate as a function of engine RPM, temperature, and detonation sensor inputs. To remove all doubt, disconnect the EST bypass connector is your car is so equipped. Some TBI and V-6 engines do not have this bypass connector, and therefore must be set with no regard to the EST system. The EST can be bypassed on some cars by grounding the diagnostic terminal at the ALDL and continuing with the procedure, but the fuel mixture will be skewed to the rich side, affecting idle speed as well. In any event, the minimum air position idle speed range is wide enough to allow for some variations. As always, it is best to consult your service manual for the exact procedure for your system. " -Vader
How many of you guys set up your min air with the est connector disconnected? is that the proper way? i am going to try it this way instead of the way i usually do it, with the est connected.
i've searched and no body seems to mention if they did or not? hmmm....
How many of you guys set up your min air with the est connector disconnected? is that the proper way? i am going to try it this way instead of the way i usually do it, with the est connected.
i've searched and no body seems to mention if they did or not? hmmm.... [/b]
I've always left the EST connected, none of the 4 manuals I have says anything about disconnecting it to set minimum air. Vader's post was the first time I ever heard of it.
