SL-Class (R129) 1990-2002: SL 280, SL 300, SL 320, SL 500, SL 600, SL 60 AMG

SL/R129: 1999 sl 500 idle speed adjustment

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Old 09-25-2009, 07:58 PM
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2003 SL500
1999 sl 500 idle speed adjustment

How do I adjust the idle speed on my 1999 sl 500 and what is the correct speed?
RRV
Old 09-29-2009, 08:54 AM
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'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55
The idle speed is computer-controlled, and there is no provision for adjustment. I don't remember the spec for idle speed, but with the engine warmed-up I'll guess it is around 650 RPM.
Old 10-07-2009, 11:58 PM
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2003 SL500
Idle speed

Bob,
Thanks,
The problem I am having is that the car is hard to keep still at redlights, it wants to move forward. Keep in mind I just had the tranny replaced with a guaranteed remanufactured unit. Is there a solution that I can try other than sending the car to the stealer?
RRV
Old 10-31-2009, 08:01 PM
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2003 SL500
idle speed

Just to close out the story, I finally got a check engine light. Code said I needed stage 2 oxy sensor. Replaced it and all is fine now.
Thanks

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