'94 Bonny - Runs rough, shuts off and very noisy - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-11-2009, 01:53 PM   #1
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Question '94 Bonny - Runs rough, shuts off and very noisy

I have a 94 Bonneville that is having several issues. They may be related to each other though.

When I first start my car in the morning the engine will run rough (lopping) and shut off. It also makes a loud sucking noise of air thru the MAF. After about 10 mins of warming up it goes back to semi normal. There is also an exhaust leak some where I think either in the exhaust manifold or one of the pipes. Would the exhaust leak cause incorrect readings from a sensor that would cause the first problem? What should I check first?

I did change the air filter, spark plugs, cleaned the MAF sensor, swaped out the EGR valve.

Any suggestions?
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