Question about 1993 Buick LeSabre

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High speed idle

Engine idles at 1800 to 2000 rpms.

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  • namrocden Mar 06, 2009

    No vacum leaks,checked, then blocked all of them, checked intake,nothing, Yes service engine soon light is on. A/C doesn't work now even though it just had a new pump installed.

  • Anonymous Mar 17, 2009

    When I removed the IAC it came apart, so i replaced with new one, followed instructions, no change. However i found if i apply my power probe to the center connection on the TSP the car will return to a IDLE until you restart the car.

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Throttle control sensor- located just above the thermostat housing; It has a three pronged sevo clip going to it.

Posted on Mar 15, 2009

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You have either a vacuum leak or your IAC (idle air control) motor is stuck.
No service engine light on I assume.
Let me know.
Regards,

Posted on Mar 06, 2009

  • Bruce Bracey
    Bruce Bracey Mar 06, 2009

    You will want to remove the IAC at the throttle body and clean the pintal, bore and seat. You can use some carburetor cleaner, spray the IAC pintal stem and spring liberally until clean, reinstall motor, disconnect car battery for 5 minutes, start engine and drive 5 to 10 miles above 45 mph. The IAC and ECM should reset.

    Give it a try and let me know.



    PS you can move the pintal gently in and out while you have it remove, be careful not to pull it out.



    Good luck, let me know.

    Regards

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SOURCE: rendezvous 04, the rpms stay idling high without pressing gas.

BUICK RENDEZVOUS IDLES UP REALLY HIGH...WITHOUT PRESSING GAS. WHAT IS THIS?

Posted on Jan 03, 2010

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Posted on Jan 02, 2017

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