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1994 C280 CODE P0505 Help...

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Old Aug 27, 2011 | 07:56 PM
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marcinh78
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2005 C55 AMG
Exclamation 1994 C280 CODE P0505 Help...
Hi...
I have problems with engine start when engine cold or hot same results every time! Plus RPM is all over the place. When I start engine goes up to 1200RPM and then goes down to 600RPM and stays there. As soon as I start driving and stop RPM is at 1200RPM. I can only lower it by turning AC on.
After all that I pulled code P0505 which is IDLE CONTROL SYSTEM MLF!
How do you fix that problem...? Do I need to take idle actuator out and clean it or replace that part, which is super expensive!!! Any ideas where should I start...???
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