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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 09-29-2008, 05:27 AM   #1
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Default new here. few irritating questions.

Names Josh. 95 bonneville SE

193k on it. rebuilt trans.
The RPMs jump up and down between 1000 and almost 0 then it idles back up then finally dies.

I replaced the Idle Air CV and that did absolutely nothing.Checked all my vacuum lines for leaks briefly.

It starts well cold with the IAC valve plugged in but will jump RPMs until it dies.Starts very hard with it unplugged and occasionally will sputter when you gas it cold.
When its warmed up it runs fine if you unplug the IAC valve. Idles a little high but doesnt die or jump RPMs. As soon as you plug it back in, it jumps RPMs and dies.

Also on the freeway, the best i can describe it it a hard "miss" does it every 5 miles or so.
The car just feels like it doesnt fire on one or two cyls then runs great for a few more miles.
Any input would be greatly appreciated!!! Thanks!
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Old 09-29-2008, 07:49 AM   #2
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There are a couple of things I see as possible.

Have you checked and cleaned your MAF sensor?

The other is the ecm. The 94/95'* would sometimes go bad and cause oddities that were tough to follow or diagnose. When all else failed, a ecm swap would frequently fix it right up.
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Old 09-29-2008, 03:56 PM   #3
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the Ecm being the main computer correct?

ill try the MAF tomorrow. thanks!
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Old 09-29-2008, 04:17 PM   #4
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Yes, engine control.
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