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gas guzzling and no leaks
Hello
My 1991 Cutlass goes through gas like crazy lately with no smell of gas or apparent leaks. I recently replaced the exhaust manifold and the spring bolts do not form a perfect seal. Could this be tricking the computer into running a super rich mixture. I have noticed this problem a lot more since it has gotten cold in central PA. Thanks for any help Bob |
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Hi Daniel,
It was getting about 10 mpg on a 4cyl. The spring bolts hold the exhaust pipe to the mainifold and this seal is downstream from the O2 sensor. There is a flaw in the exhaust pipe where it does not seal all the way; it will if I stud bolt this pipe to the manifold, but this stress causes the mainfold to crack over time (3rd manifold in 3 years. There is a slight leak that is most noticeably when I start the car, then it goes away when it warms up. Hope this helps. Bob Daniel J. Stern wrote: > On Tue, 1 Feb 2005 wrote: > > > My 1991 Cutlass goes through gas like crazy lately with no smell of gas > > or apparent leaks. I recently replaced the exhaust manifold and the > > spring bolts do not form a perfect seal. Could this be tricking the > > computer into running a super rich mixture. I have noticed this problem > > a lot more since it has gotten cold in central PA. > > What does "goes through gas like crazy" mean to you? > > What do you mean by the spring bolts "do not form a perfect seal"? Can you > detect an exhaust leak? A leak upstream of the O2 sensor will drive the > O2S lean and cause an overly-rich mixture. |
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gas guzzling and no leaks | [email protected] | General | 1 | February 2nd 05 10:54 AM |