rough idle, no acceleration

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, Olds 98 91-96, Buick Lesabres and Park Avenue 91-96. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.
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egg
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Year and Trim: 1992 buick park avenue

rough idle, no acceleration

Post by egg »

92 park avenue has very rough idle, no acceleration. Replaced plugs/wires, Idler Control, and checked cat. converter. Any idea?
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Bonnefied_GM
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Year and Trim: 1998 SE (w/ SLE package)
Location: Lincoln, NE

Re: rough idle, no acceleration

Post by Bonnefied_GM »

Vacuum leak?
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1989 Buick Reatta:SOLD (sold at 105k)
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RJolly87
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Year and Trim: 1993 Buick Park Avenue
1994 Buick Regal Custom
Location: Las Cruces, NM

Re: rough idle, no acceleration

Post by RJolly87 »

Is the Service Engine Soon light currently on?
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1993 Buick Park Avenue - 197k - Some odds and ends done - Simply won't die
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renchjeep
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Re: rough idle, no acceleration

Post by renchjeep »

MAP sensor? First place I would look...
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sonoma_zr2
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1997 SSEi-Resting-353K
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Re: rough idle, no acceleration

Post by sonoma_zr2 »

I would suggest pulling the connector on the MAF sensor and see if the idle changes. This will trip a "service" light if it is not already on. My thought is a vacuum leak or MAF sensor.
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1oldman
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Re: rough idle, no acceleration

Post by 1oldman »

Also, get a code scanner and see if you have any errors that amount to anything in the PCM.
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2017 Hyundai Santa Fe Sport ..... 1992 Bonneville SSE 1SB 170 HP L27 4T60E retired/sold to MattStrike ..... 2005 Bonneville SE 1SC 205 HP L36 4T65E - retired/salvage yard ..... PBCF user 2321
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egg
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Joined: Fri May 13, 2011 9:01 pm
Year and Trim: 1992 buick park avenue

Re: rough idle, no acceleration

Post by egg »

Thanks everyone. It ended up that the ICM was shot. It's running nicely now.
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