Code 18, Rough Idle - 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 10-23-2005, 11:58 PM   #1
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Default Code 18, Rough Idle

okay i've been having this problem ever sense i got the car. when i start the car it idles at abou 400RPM and the SES light is on. CODE 18. if i rev it at all, even for just a second the SES light goes away and it idles much better, but it is still a bit rough.i just changed the plugs, wires and air filter. i read in techinfo code 18 is cam/crank error

Any Idea'*?
Devon
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Old 10-24-2005, 01:54 PM   #2
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There may be a problem with your crank sensor, and I can't comment on that, but I can say that there was once a time when my '93 SSEi used to idle at low RPMs after starting, and it was due to a dirty throttle body.
On my '93, sometimes (usually only when the engine was warm) the engine would try to idle at 400 or 500 RPMs after initial starting. If I did nothing and let it continue, the engine would typically stall shortly after that, but if I pressed the accelerator a little and held it for just a second or two and then gently let go, the idle would remain in the correct range at approximately 700 RPMs. In my case, the problem was due to a dirty throttle body.

These engines aren't designed to idle at such low RPMs.
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Old 10-24-2005, 01:55 PM   #3
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Hm i'll clean out the throttle body then. hopefully that will help. as i dont want any expensive or time consuming repairs
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