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Re: Service Engine Soon Light Ghost!
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ChevyTech, The scanner I have is fairly generic. It recognizes the system as a GM OBD 1, asks for year, 8th digit, truck or car, and trans. Then it gives "memory retrieval successful..." Then "There are no stored codes in the computer"
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Don't trust what the tool tells you.
Read the codes manually.
Checking OBD1 computer codes without a scan tool.
http://67-72chevytrucks.com/vboard/s...5&postcount=11
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I unplugged the Computer controlled advance wire and it set the SES light, I unplugged the EGR solenoid and it set the light... is this what you are looking for, or does it specifically have to be the TPS?
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Those are good enough tests. No need to try unplugging the TPS. The computer is seeing what is happening and my guess is that there are trouble codes set, but the tool you are using can read the codes.
Lets us know what codes you find.
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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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