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Old 10-03-2003, 08:16 PM
suginami suginami is offline
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Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,508
Your engine does not have an idle control valve. M103 and M102 engines have idle control valves.

M104 engines have a throttle actuator, which electronically controls three functions: Idle speed control, electronic accelerator, and cruise control. I don't believe it can be cleaned to fix the problem.

I don't know if the problem is your throttle actuator or not, but if replacing the Mass Air Meter didn't fix the problem, and if you don't have a vacum leak, then I would point the blame at the throttle actuator.

They usually fail for two reasons:

1. they have potentiometers that wear out over time.
2. they have a wire harness that has bad insualtion which flakes off, which cause the actuator itself to malfunction.
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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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