1994 Olds Cutlass: rough running engine


Old 09-08-16, 06:27 AM
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1994 Olds Cutlass: rough running engine

I have a 1994 Olds Cutless Ciera S, 84000 miles, 3.1 engine. Over the last 6 months it has been running rough when cold, and recently it has started stalling after it has set a while with a warm engine. Recently changed the plugs. The old ones weren't that bad, ( none were fouled ). It didn't help so I changed the plug wires, and the coil packs had some corrosion on the even bank of plugs
(2,4,and 6) The odd bank were all clean. Anyone have any ideas Thanks
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Old 09-08-16, 07:29 PM
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That year GM vehicle is on the borderline of OBD and OBD-II diagnostics. You definitely should have it checked for any trouble codes. Is there a lit check engine light ?

The crank sensor was a particular problem on the 1994 Cutlass with the 3.1l engine.
Another common problem on older vehicles is a carboned up EGR valve to the point where the valve won't fully close when it should.
Old 09-09-16, 07:52 PM
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my best guess would be a vacuum leak at the intake.
Old 09-10-16, 05:07 PM
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oh that's old enough, how is it now?
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