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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 03-15-2009, 08:51 PM   #1
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Question Gas problems

Have a 1995 Pontiac Bonneville SE 3.8 The car runs great with it'* newly rebuilt engine. Recently I noticed it has been using a lot of gas. Upon inspection - I see smoke being emitted from the tail pipe with a heavy odor of gas. I cleaned my MAP sensor. Car still smokes at tailpipe. Tried raping the gas regulator to see if anything was stuck (who knows)..and also fixed a leaking vacuum line at the gas regulator.

Does anyone have any ideas as to what could be causing this to happen. I also thought of a oxygen sensor. I am thinking the gas regulator is bad or the oxygen sensor is bad. Has anyone ever had this happen to there car. I had checked the forum and saw no mention of this kind of problem - specifically. Thank you for your help.
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Old 03-15-2009, 08:55 PM   #2
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Check/change/test your intake air temp sensor, MAF, O2 sensor. These all effect your AFR. If you have a strong gas spell at the tail pipe your cat may be shot.
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Old 03-15-2009, 11:57 PM   #3
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How bad are you doing on gas?
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Old 03-17-2009, 11:09 AM   #4
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I have been having the same problem with my 93 ssei and have had not luck getting it any better.
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Old 03-17-2009, 11:39 AM   #5
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do either of you have an codes? ses light? or is it just going thru gas?
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Old 03-23-2009, 11:26 PM   #6
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No codes at all.
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Old 03-23-2009, 11:32 PM   #7
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So you said you cleaned the MAF sensor and it'* still smoking and smelling of gas? I would change the upper O2 sensor next. Go with a DENSO and stay away from the BOSCH. After you change the sensor, then let'* see what happens from that point forward.
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