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hissing noise


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Anonymous Poster

Jan 19, 2007, 11:05 PM

Post #1 of 5 (767 views)
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I have a 1986 cutless supreme V6 and there is a hissing noise when idle and driving what could be the problem?


Tom Greenleaf
Ultimate Carjunky / Moderator


Jan 20, 2007, 12:37 AM

Post #2 of 5 (764 views)
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Probably a vacuum leak or perhaps an exhaust leak, T
_________________________________________
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Anonymous Poster

Jan 20, 2007, 12:44 AM

Post #3 of 5 (763 views)
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how to check for etheir one


Tom Greenleaf
Ultimate Carjunky / Moderator


Jan 20, 2007, 12:46 AM

Post #4 of 5 (762 views)
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It's apparent that you shouldn't be working on you own cars, T
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Long retired now


steve01832
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Jan 20, 2007, 6:12 AM

Post #5 of 5 (757 views)
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If the hissing noise gets louder as you accelerate, have a backpressure test performed to see if you have a restricted exhaust / clogged converter. As for the white smoke coming from the oil filler and dipstick tube you mentioned in a previous thread, it may be related or you can be looking at excessive engine wear resulting in blow-by, or a possible head problem. Start with the backpressure test and go from there. Seeing that you also have an acceleration problem, my guess is you have a clogged converter.

Note: If you would have made 1 post with all of the symptoms instead of 3 individual posts, the diagnosis would have been easier.

Steve


(This post was edited by steve01832 on Jan 20, 2007, 6:16 AM)




hissing noise


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