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Old 12-08-2001, 03:59 PM
lin
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Smile Idle speed questions

Hi!

When the engine is cold, the idle speed of my 85 380SE is normal. It's roughly around 900 rpm when gear is on "P" and 500 rpm when gear is on "D". When the engine temperature reaches above 80 C, the idle speed suddenly increases to 800 rpm when gear is on "D" and 1600 rpm when gear is on "P".

The idle speed is very stable and the engine runs very smooth. I am thinking about replacing the idle speed control unit (part # 002 545 3332).

I know the high idle speed can be caused by many area.
Where should I start to check in order to identify the problem? I hate to spend the money and the problem is still there.

I appreciate your help.


Regards,
Lin

1985 380SE
Austin, TX
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