I suspect the engine has a leaking exhaust manifold
1995 BUICK RIVIERA
160,503 MILES
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When the engine is first started I suspect the noise I hear is a leak from the exhaust manifold. However after a short while the noise is silent.
May 2, 2012 at 9:42 PM
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SATURNTECH9
AUTOMOTIVE REPAIR CONTRIBUTOR
30,869 POSTS
See if you have any loose or broken bolts holding the manifold on also look for black carbon showing signs off exhaust going around the manifold. Thats where i would start.
May 2, 2012 at 9:49 PM
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Thanks >> Is there a spray one can spray the area to check for leaks?
May 2, 2012 at 10:12 PM
ASEMASTER6371
AUTOMOTIVE REPAIR CONTRIBUTOR
52,796 POSTS
no spray but look for smoke when you start it to narrow down the leak.
you can get someone to close off the exhaust out the back with a rag for a minute to force the leak as well.
Roy
May 2, 2012 at 11:46 PM
SATURNTECH9
AUTOMOTIVE REPAIR CONTRIBUTOR
30,869 POSTS
With the spray your thinking of looking for a vaccuum leqk not exhaust leak.