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6,102 Posts
Welcome to the forum first off. If it were me, I would investigate the wiring harness more rather than take it or sell it. The engine control harness itself is not that big compared to some of them out there, and all the wiring ends only fit one way, all the connectors are specific and can't be swapped accidently, or they are marked as far as the injectors go.
Now, the P0508 is the IAC, intake air control switch, located on the back side of the throttle body. Try pulling it off, cleaning the connections and reinstalling. There is a red tab that has to be released or pried up before it comes off. Check the wiring from it to the PCM or as far as you can follow it, look for breaks, cracks, oily conditions that may make it short. the idea is to determine if it is an IAC problem causing the shutdown or the IAC is faulty. What with the location of the wiring and stuff to it, it may have become damaged during the rebuild way back when, so a whole wiring harness should not be necessary.
Keep us informed of what you find, wiring problems tend to be intermittent, bad harnesses and PCMs tend to be constant, especially when a certain set of parameters are met, such as before the car is warmed, or when the car is warmed up, or let's say the harness is flexed in a corner, hard acceleration, a certain speed, something like that.
Now, the P0508 is the IAC, intake air control switch, located on the back side of the throttle body. Try pulling it off, cleaning the connections and reinstalling. There is a red tab that has to be released or pried up before it comes off. Check the wiring from it to the PCM or as far as you can follow it, look for breaks, cracks, oily conditions that may make it short. the idea is to determine if it is an IAC problem causing the shutdown or the IAC is faulty. What with the location of the wiring and stuff to it, it may have become damaged during the rebuild way back when, so a whole wiring harness should not be necessary.
Keep us informed of what you find, wiring problems tend to be intermittent, bad harnesses and PCMs tend to be constant, especially when a certain set of parameters are met, such as before the car is warmed, or when the car is warmed up, or let's say the harness is flexed in a corner, hard acceleration, a certain speed, something like that.