12 mpg 1993 ssei ???!!! - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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 02-27-2009, 10:54 AM   #21
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If you could, repost what all has been done.
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Old 02-27-2009, 12:19 PM   #22
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I replaced the o2 Sensor.(made sure it didn't touch the plug wire)Checked the plugs. Checked the PCV valve.Replaced the fuel filter. Air Cleaner is good. MAF was cleaned. Coils,alternator and throttle position sensor were replaced within a few years. My friend is bringing the car to his shop to check the air intake temperature sensor fuel pressure and regulator today.
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Old 02-27-2009, 12:42 PM   #23
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I was just going to point out the fuel pressure. Changing the fuel filter can help as well.
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Old 02-28-2009, 03:11 PM   #24
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Well actually I had replaced the filter as well. I think I found the problem though. There was a dry rotten vaccuum line that was cracked. I think that should fix it. I'll post my new MPG numers after I drive ot a bit more.
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Old 02-28-2009, 03:57 PM   #25
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Didn't we mention check for a vac leak? If not we should have.
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Old 03-01-2009, 12:19 PM   #26
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Right HA thanks. Well it works now anyways. Thanks for your help guys appreciate it.
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Old 03-04-2009, 11:54 PM   #27
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Ok so I have driven the car quite a bit more and in fact have noticed no change in fuel economy it is becoming quite a headache as it is still sucking fuel. I did notice that when it is cold out a very obvious smell of gasoline is exhausted. Please if anybody knows what this could be?
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Old 03-05-2009, 12:00 AM   #28
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A gas smell could be caused by incomplete burn, weak spark, bad spark plug, grounding can cause this. Forgive me if I suggested this already, but have you tried taking a spray bottle with water and misting the plug wires and coils. Do this at night with the lights out. If you have a grounding problem, you will see blue arch.
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Old 03-05-2009, 12:09 AM   #29
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No you hadn't that is possible though as my friend say he noticed my lights flicker and dim a little even though the alternator is fairly new.
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