1995 SSE Burns A Lot of Fuel!!! - 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 06-01-2009, 01:33 PM   #1
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Default 1995 SSE Burns A Lot of Fuel!!!

My dad owns a 1995 Bonneville SSE and he has been complaining about very poor fuel economy. The car does not have a CEL or any obvious signs that something is wrong.
My little brother that also drives the car says there is a strong gas smell when you drive the car...kind of fills the cabin...but there is no physical leak...

I thought maybe the cats might be clogged, but the car accelerates fine...not as if the exhaust was blocked.

I have no clue whats wrong with it. I thought maybe O2 sensors, MAF/MAP sensor, or fuel pressure regulator...any other suggestions?

I'd like to figure this out for my dad; thanks for the help.
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Old 06-01-2009, 01:46 PM   #2
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have the same problem, changed the MAF,changed the fuel pressure regulator. Im thinking either the crank sensor or most likely the O2 sensor.
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Old 06-01-2009, 01:50 PM   #3
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I would start with changing the O2 sensor. Clean the MAF and change the plugs and air filter. It sounds like your running rich and over loading the cat.
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Old 06-01-2009, 02:33 PM   #4
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Thanks for the suggestions guys... I will sure try those and report back.

In the meantime, keep the suggestions coming!!
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Old 06-03-2009, 02:02 PM   #5
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Quote:
Originally Posted by Danthurs View Post
I would start with changing the O2 sensor. Clean the MAF and change the plugs and air filter. It sounds like your running rich and over loading the cat.
Dan, I haven't looked under the hood in detail yet. But how many primary O2 sensors do these cars have? I figure since its a V-6 it would have 2... Should I stick to GM parts or would generic autoparts do (wagner, bosch, etc)?

Also, for cleaning the MAF, just use a generic autoparts MAF spray cleaner?
Any recommended plugs or do Bosch platinums work fine?

Thanks for the help!!
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Old 06-03-2009, 02:03 PM   #6
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There'* only one O2 to be concerned with. It'* the one in the rear exhaust manifold.
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Old 06-03-2009, 02:09 PM   #7
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Wow, thats strange, I wonder why didn't they use two...one on each bank?

Thanks a lot, I can let my dad what to buy... Any preferences on brand?

I forgot to add that the car only has like 70K miles...it barely gets driven.
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Old 06-05-2009, 10:17 AM   #8
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...bump...
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Old 06-05-2009, 10:38 AM   #9
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Any O2 sensor should be fine. Just not a Bosh, those seem to not work well in these cars.
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Old 06-05-2009, 10:51 AM   #10
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Not Bosch... Thanks!!
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