Mechanics

95 DOES IDLE RIGHT

1995 GMC Safari

I have a 95 GMC safari van 2wd 4.3 v6 auto with 145,000 miles. When I drove over 120 miles or so the van would not idle when I stopped it would even die. Gradually the van started running bad all the time. I have replaced the spark plugs, rotor, cap, air temp sensor, coolant temp sensor, oxygen sensor, removed the catalatyc converter then I replaced the EGR valve. The check engine light told me to replace the EGR valve. After replacing the valve the engine won't idle and runs bad. I removed the new valve and checked to see if it was plugged and it was not. The check engine light gave the code to replace the valve again. I check the voltage on the wires and that is correct. It acts like the valve stays open all the time. I searched for a blown fuse and could not find any but I might not have found all the fuses I need to check.
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Aminnick
July 19, 2007.



Couldn't have said it better myself. '95, 148k, meticulously maintained. The last 9 months have seen new fuel pump, 3 fuel filters, air filter, IAT valve, IAC valve, coolant temp. Sensor, vacuum lines, and Berryman's B-12 thru the fuel system. Finally gave up and took it in for a full diagnostic at the f@*$^ing dealershp -- they found nothing wrong at all. Still, the warmer it gets and/or the longer it runs, the worse the stumbling idle and lower the oil pressure gauge reads. Only thing I've heard that I haven't tried is a possible plugged oil pickup screen. Sounds like a lot of fun to fix and, running full synthetic changed every 3k with filter, I don't know how likely that sounds. Damn.
Am going to drop the $70 on O2 sensor today and am prepared to be underwhelmed. Will post if any miracles happen.

Tiny
Sidbaxter
Aug 16, 2007.
Cap, wires, plugs, rotor, gas cap all recently replaced, too.

Tiny
Sidbaxter
Aug 16, 2007.