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Old 01-18-2003, 11:08 PM
Registered User
Join Date: Jun 1999
Location: Surrey, Beautiful British Columbia, Canada
Posts: 750
Idle Control Valve Question

Does anyone knows if the "door" of the valve
should be completely shut-closed when closed,
of slightly opened ?

Prayers bring forth enlightenment.
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Old 01-19-2003, 09:53 AM
Registered User
Join Date: Jul 2001
Location: SoCal
Posts: 1,303
After I cleaned ours (1991 190E 2.3), I noted its movement was free all the way to the stop, where it remained open a slight amount. I was satisfied it was stopped mechanically at this point, and the opening was still sufficient that any slight wear would not have made any difference.

I tested it with a bench power supply, so I could adjust the voltage/current supplied it, and it appeared to react smoothly, consistently, to the applied voltage on its terminals. Testing prior to cleaning revealed a certain gumminess to its action, and repeatability was not so good. Since this device is inside loop control for the idle speed, I suspect the engine controls can recover from most ills of this device other than jamming, failed electromagnet, or air leakage.

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Old 01-19-2003, 01:09 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Different answers for different cars.

Basically the idle valve goes to a limp home position when unpowered. Again this varies by system. The system used on 4 and 6 cylinder KE aquires an opening size that gives an amount of air equal to a slightly higher than normal idle speed with the A/C off and out of gear. That same amount is not very good when the A/C is engaged and the car placed in gear.

The early K-jet w/Lambda v8s had valves that went all the way open when unpowered.

The LH, HFM, and ME systems use throttle aactuators that are spring loaded to a position similar in concept to the KE cars (slightly higher when unpowered).
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 01-19-2003, 01:23 PM
Registered User
Join Date: Jun 1999
Location: Surrey, Beautiful British Columbia, Canada
Posts: 750
the reason for this question is due to some maintenance
(cleaning) suggested by some listers, which include
bench-testing the unit with 12v power.

thanks, steve b. for clarifying this.

Prayers bring forth enlightenment.
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