Re: 89 tbi running & starting problem
IAC passages can get plugged up with carbon or muck. Did you clean them?
The IAC (idle air control) is what gives the fast idle speed when started cold.
The engine should start well without the gas pedal being pushed down at all.
My guess is the truck runs so poorly you can not tell if the IAC is working or not.
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For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.
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