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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 12-23-2008, 11:48 PM   #1
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ok, so nichole finally let me drive the car on the highway where I could really open it up and i was expecting the acceleration to be as spirited as it is in city driving, but no. i was cruising at 70 mph and stomped on the gas and the engine rpms jumped but barely felt an increase..then the car finally got some power then lost it and it felt like i was possibly running on less than 6 cylinders! i still need to do the sparkplugs (bought them already, just need to install) because i'm sure they're in dire need of replacement but i was also wondering if the coil packs ever go bad or get weak? i don't understand how the car would be better at low speeds than high speeds.
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Old 12-23-2008, 11:52 PM   #2
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What is the year and trim level of this car? Changing the plugs is a good place to start. Also check the air filter and fuel pressure.
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Old 12-24-2008, 12:37 AM   #3
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1995 ssei
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Old 12-24-2008, 10:20 PM   #4
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I'd look at fuel pressure and fuel flow. I have had a pump strainer nearly clog, causing hesitation and very poor performance below 1/2 tank.
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Old 12-24-2008, 10:47 PM   #5
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And being a 95, the baffles could broken and laying in the bottom of the tank. I'd check the fuel pressure as well. Does it do this when turning corners tightly as well?
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Old 12-24-2008, 11:01 PM   #6
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i don't know if it does or not. that just reminded me of the fact that the car set from 2000 to 2007 in a driveway with the same gas in it...maybe the fuel filter is clogged? how hard is it to change it? also, how do I go about checking fuel pressure on an L67 series 1?
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Old 12-25-2008, 07:05 PM   #7
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I'd get the old gas out first and change the fuel filter. I'm surprised it would even run.
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