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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / February 2005gas 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 > 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. 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 > > 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 [quoted text clipped - 7 lines] > detect an exhaust leak? A leak upstream of the O2 sensor will drive the > O2S lean and cause an overly-rich mixture. > It was getting about 10 mpg on a 4cyl. That's definitely very low. > The spring bolts hold the exhaust > pipe to the mainifold and this seal is downstream from the O2 sensor. Then that's not driving your O2S lean, and your problem probably lies elsewhere. Time for some systematic diagnosis. |
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