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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 05-27-2009, 09:48 PM   #1
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Default Running rough

Whats up guys new to the forum. Ive had my bonnie for about 3 yearsnow with no prolems at all. But here lately its running really rough. Ive changed all 3 coil packs, new plugs, new wires and it hasnt helped at all. it runs worse as you're accelerating. also the boost gauge doesnt moe smoothly like it used to it moves very erratically even at idle. ive changed the supercharger oil recently also. i put it on a scantool and it says multiple misfires. any ideas??
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Old 05-27-2009, 10:00 PM   #2
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That sounds like a vacuum leak. Spray some carb cleaner on all the vacuum lines while the engine is running and if the RPM changes you found the leak.
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Old 05-27-2009, 10:09 PM   #3
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ok i will do that tomorow. i kno all of the little rubber boots on the end of the vacuum lines are dry rotted so you might be right. ill let you guys kno
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Old 05-27-2009, 10:10 PM   #4
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What I suggest is go to a place like autozone or advanced and get the generic vacuum lines. They come in a pack. Then just cut to length and start replacing. You can get red, blue, or black.
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Old 05-28-2009, 08:05 AM   #5
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I'm with Dan. Replace all the bad vacuum line fittings. But also check to make sure that none of the spark plug wires are touching the O2 sensor wires. This may cause a rough idle. But most likely not cause a multiple misfire.
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Old 05-30-2009, 12:45 PM   #6
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had similar problem. It was the control module under the coil packs. common problem in this series of bonneville. cost was 127 at autozone. fixed problem for me. hope it helps.
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