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Originally Posted by Dibsing
I recently got a oil change and a fuel flush done on my 1986 GMC S-15 4x4 V6 2.8 with a RV cam. As soon as i got it back, the check engine light was on. I did the paperclip diagnosis and it came back that it was a bad Map sensor and bad O2 sensor. I have changed these sensors both before the oil change. Does the computer need to be reset? It never was on 24/7 like it is now.( codes were 3 pause 4 and 4 pause 5)
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You should check to make sure the sensors are seated correctly, then, yes, pull the fuses for the ecm, or pull the neg. battery cable. After letting it sit for a couple minutes, ( i always go have a smoke), reconnect, start engine, and let the engine re-learn the idle. (don't use the accelerator) Hopefully this will help. If you still get codes, try an old computer trick: pull the old sensors, use electric contact cleaner to clean the connections, let dry, re-seat the sensors, clear the computer memory again, and see if that fixes it.
