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Re: 1990 c3500 coolant temperature sensor wiring question
Yes that truck has an ESC (Electronic Spark Control) module that the knock sensor connects to. The ESC signal is sent to the ECM terminal B7
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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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