Question about 1991 Oldsmobile Cutlass Supreme
Replaced wires, plugs, ISC, and repaired vacuum leaks. Cleaned EGR valve and ports and still runs quite rough, lean, and continues to set high voltage for MAP and short in ISC motor (just replaced it also).
This is a long shot, but it happened to my 3.1 corsica. After all the friggin around and testing everything I discovered it was a loose wire on the back of the computer. It was a wire that went into the plug itself. I wiggled the wires and all of a sudden it kicked in good. I moved my hand away, and there it was again. . The computer is probably located under the dash on the passengers side. Easy to get at. It's worth a try. If not that, you may have a bad computer, but check loose wires first. Let me know how you make out please. If that isn't the problem I'll be glad to walk you through some more tests
Posted on Jan 12, 2013
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Posted on Jan 02, 2017
SOURCE: Oldsmobile Alero EGR valve bad
yes you can do it yourself the egr valve is located on the exaust manifold closest to the fire wall unfortunately it has to be replace. it has an electronic lead to it and is vaccum operated to replace it is not a difficult task. the part can be purchased at a Napa or Oreilly's for alot less than at a dealership. just make sure your gasket surfaces are clean for replacement of new gaskets. if you have a code reader than can reset the code that is a benefit however if you do not you have to have a scan tool to reset the code. please rate the solution....thanks
Posted on Sep 19, 2008
SOURCE: rough idle
I had this problem with a Mazda I had and I did everything I could think of. Check for vac leaks again and then check air cleaner hoses. I suggest this, because I found mine right smack dab in the crevasse of the air intake for the air cleaner.
Posted on Apr 01, 2010
If it sat for 3 years the fuel may be in pretty tough shape. If he gasoline smells like a can of old varnish or turpentine then it may have gummed up either the fuel pump, injectors or both. I would start by testing the fuel pressure with a gauge first to see if it is actually pumping enough fuel to run the engine. If the fuel smells bad or your pump isn't working you may need to have the fuel tank removed and cleaned and the fuel lines flushed to get all the old gunky fuel out of them. Also check to be sure you actually have spark at the plugs so you'll know if the ignition system is still working.
Posted on Jun 16, 2010
Testimonial: "was pulling the tank when i got the email all i been doing i completely over looked checking for spark at each plug because it starts it has three seperate coils so should have pulled the injectors earlier to poor to have them tested but the screens in the top look pretty fouled tho i truely have never messed with injectors before the fuel smelled good and had not but a few water beads but is a bit thin looking fuel tank pumps and has good pressure at the fuel rail but again no way to actually check pressure thank you for your help"
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