Rough start - 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 01-14-2014, 10:29 AM   #1
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Default Rough start

I have a 99 pont Bonn, 3800 II, no supercharge with 230k.

Having ruff starts, sparatic idle, then would run fine.

so I replaced plugs, wires, coil paks,fuel injectors, fuel regulator, fuel filter.
This got rid of engine code, misfire cyl 5

still ruff starts, if i held gas down a little, it would start right up, but wouldnt start if I just turned key, had to give it gas.
Engine light came on, took to autozone, gave 1404, which means their scanner couldnt diagnose the problem.

After reading your posts changed the Idler Air Contrl Valve, in process broke off both screw heads holding it on, I even bought the correct star tip to get it off. be careful. Had to pull the whole intake out, drill out holes.
But it worked, starts right up, and idles fine,
Thanks for great advice!!
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Old 01-14-2014, 11:39 AM   #2
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well if it fine then all good. but if in the future it gives the 1404, thats faulty egr closed performance, dont know who told you different. could be egr needs cleaned or sometimes that corrugated pipe cracks on 3800'*
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