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Old 04-24-2002, 08:35 PM
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Rotary idle actuator

I am having idling problems with my 1990 300E-24. I read that cleaning the rotary idle actuator can sometimes fix the problem. When I pulled it the rotor did seem to be siezed so I cleaned it and eventually got it freed up. After refitting it, on starting it shot up to 2000 rpm for about 10 seconds then stopped, this was repeated several times. I have disconnected the actuator (electrically that is) to get it running again and the car is now back where it started, idling at 1100rpm. I have two questions:

1 Does this tend to confirm that the idle actuator is u/s.

2 Does running the car with the actuator disconnected for a while cause any problems, it seems to be running ok otherwise.

Any input appreciated


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Old 08-01-2002, 07:11 AM
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Join Date: Jul 2002
Location: Sydney, Australia
Posts: 1
Slow Cold Idle / Rotary Idle Actuator Seems OK

I'm having rpoblems with my '87 230e. Cold idle is low as if there is no high speed idle system. I did some research and played around without much success. What I did find was:The rotary actuator is driven by the ECU. At cold start the ECU sends 12 volts to it and it opens an internal passage for air to bypass the throttle body and hence raise the RPM. When the engine has warmed up, the actuator (on mine) was only getting 2 volts and was nearly closed as I expected. It's supposed to control fast idle during warm up, and idle speed under load, e.g. with air con or power steering actuated. I pulled the top hose off and put 12 volts to it and you could see the actuator work. Even so, mine won't idle properly when cold and when you put the air con on the idle drops. Out of curiosity, with the engine running I carefully moved the air hose to the actuator around to make it leak. Sure enough, the revs went up. So I don't know what's going on. The rotary actuator seems to work but it's not controlling the idle properly.
Any ideas.
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