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egr driving me crazy


midcon1351

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i have a 95 lumina the trouble code tell me that it is not plugged in i replaced the egr the plug in to it chacked all the fusses and un pluged the battery to reset the codes but it still comes up what do i do now:think:

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If you don't use a scan tool to clear the code, won't it take a few miles of driving for it to reset?

 

More than likely, especially it being the EGR. I would just go to autozone and have them scan the code, and have them clear it. It will more than likely come back if there is a wire broke, pinched, or whatever until its actually checked out and fixed.

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the OBD1.5 PCMs have 2 sets of DTCs, current codes and history codes. current codes go away at key-off and get stored as history codes. if they get triggered again, they are set as both history and current. it takes quite a few drive cycles to clear the history codes, somewhere around 50 IIRC.

 

i can't remember if history codes will trigger the SES light though.

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if it's not plugged in, and the PCM commands it on in a high vacuum situation, like coasting down from 70MPH, the PCM will most definitely set a code for it, since it wants to see a significant vacuum drop during a test of all 3 solenoids.

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