1990 Buick Regal GS 3.1 multi-P running rough help:( - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-16-2015, 10:33 PM   #1
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Angry 1990 Buick Regal GS 3.1 multi-P running rough help:(

Hello all! I've replaces the Tps, Iac, crank sensor, map sensor, and cleaned the Egr valve. I was cruising and lost acceleration power completely but it didn't die! I can only go about 30mph and giving it gas it shakes and runs really rough. Won't rev past 2500 RPMs And cuts out really bad. Possible Igition control module? Also there is no check engine light. It works because I pulled the connector off the tps and it throws it right away. Any help would be GREATLY appreciated. I've been stumped forever and don't wanna pour anymore money into it without knowing what to do:/
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Old 05-16-2015, 11:27 PM   #2
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Have you checked back pressure? Create exhaust leak before cat(remove O2 sensor or loosen exhaust pipe at the ex manifold.....if car now accelerates ok, you need a cat...car will be noisy during this test.....
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Old 05-17-2015, 08:42 PM   #3
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I just pulled the O2 sensor and it was very loud but I revved it up and it'* only revs to bout 2000 and only gets worse the more gas it'* given... I'm thinking of checking the coolant temp sensor and the Icm. Any other suggestions would be helpful!
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Old 05-17-2015, 08:54 PM   #4
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I also want to add that pulling the EGR connector doesn't throw a check engine light not does it change anything. Still runs just as bad but not worse
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Old 05-18-2015, 10:36 PM   #5
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You drive it, don't rev it....if power returns, it'* the cat./...
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