Lack of power, 95 LeSabre - 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 10-29-2007, 12:17 PM   #1
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Default Lack of power, 95 LeSabre

My boss has a 1995 Buick LeSabre limited with the L27. He just bought it and asked me to drive it. This car was beyond all DOGGY. The thing can barely get out of its own way, full throttle is just about needed to pull out into intersections. I asked him about it, and he told me that it'* peppy and feels great, up until the engine reaches operating temperature, then it gets doggy like that. To me, it feels like the car is starting off in third gear. When I drove it, I didn't even feel it shift a gear until 40 MPH. He mentioned that it drops in/out of OD at highway speeds too for no reason. To add to this, he is only getting around 15 MPG out of it and it has a rough idle. The check engine light is NOT on. (and there aren't any stored codes.)
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Old 10-29-2007, 01:22 PM   #2
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Clean the MAF, check for vac leaks to start.
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Old 10-29-2007, 02:11 PM   #3
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I did check for vacuum leaks, there aren't any. I've also swapped out MAF sensors already. :(
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Old 10-29-2007, 02:12 PM   #4
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Check the fuel pressure?
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Old 10-29-2007, 02:16 PM   #5
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Not yet.
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Old 10-29-2007, 02:52 PM   #6
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Check the fuel pressure when cold, then again after it dogs down.
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Old 10-29-2007, 04:19 PM   #7
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Could also be a bad cat. Suggest the usual run it around at night and look to see if it'* glowing or the kick the cat while listening for a rattle.
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