93 ssei idles rough - 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 07-14-2004, 10:24 PM   #1
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Default 93 ssei idles rough

my 93 ssei idles rough the needles jumps between 500 and 1000. if i get on the gas it runs great. i just put in new wires and plugs, it also seems to idle more smoothly when the a/c is on. does anyone have any suggestions on what to check
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Old 07-14-2004, 10:54 PM   #2
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Check the throttle position sensor.
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Old 07-14-2004, 11:39 PM   #3
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Vacuum line disconnected?
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Old 07-15-2004, 10:37 AM   #4
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I would remove and clean the IAC (idle air control) and the bore that it rides in. It is held in place with two small screws, and you can get at them but they are a little difficult to reach. The IAC is mounted on the throttle body, near where the big rubber air hose connects. Clean off all the black crap on the end of the "pintle" of the valve, and using a small rag sprayed with carb cleaner, clean out the bore where it mounts. Take the o-ring off the IAC and clean it with soap and water and re-install.

On my '92 you need to disconnect the electrical connection to the throttle sensor to make room for removing the IAC.

The IAC is what controls your idle speed. The computer directs the pintle to move in or out, allowing different amounts of air into the throttle body. They usually get all black with carbon after a while. Sometimes they need to be replaced.

When you have the A/C on, the computer tries to set a higher idle speed, and this is why it runs better with the A/C on.
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Old 07-15-2004, 11:15 AM   #5
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Quote:
Originally Posted by TelePlayer
The IAC is what controls your idle speed.
D'OH!!!

I agree!!!
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