I have looked through the '95 truck pcm calibration for the EGR related error conditions. The '87 C3's used MAP change for EGR detection but the later P4's appear to use different test criteria. ...

Thank you, but that was not my post. It contained pictures and some information for anyone who was curious.


My home unit started and operated. Without the phone I could not access electronic...

With the perspective of time it would seem the EGR "silly test" is not the best method. Code 32 in stock vehicles was always frustrating. EG richens mixture. Why not blip valve and watch for O2...