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94 GP air intake/idle problem (?)



Hello. I have a 1994 Grand Prix - 3.1L, v6 - that has recently started having engine trouble. Usually, when I try to start it (either hot or cold), it will turn over and then immediately die. I can do this over and over. Once in a while I can get it to keep running, but if I turn on the A/C, or give the engine any kind of load (like putting it in drive), it will die. If I just leave it running, it will eventually die after a few minutes. I've replaced the IAC valve, and cleaned out any carbon deposits I could see between the air hose and the intake manifold. (I replaced the fuel filter early on.)

I do get a service engine light, but I don't have easy access to the proper code reader. I've been thinking about the possibility of it being the EGR valve, but I don't know how to check it.

Any suggestions on what this might be, or a good route to help diagnose the problem?



New member
Feb 28, 2006
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Canton, MI
#1 - all you need to pull the codes on a '94 is a paper clip

#2 - pull the codes and report back with your findings

#3 - have you checked for vacuum leaks?