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#1
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Idle Control Valve Question
Does anyone knows if the "door" of the valve
should be completely shut-closed when closed, of slightly opened ?
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joel Prayers bring forth enlightenment. |
#2
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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. Steve |
#3
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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).
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Steve Brotherton Continental Imports Gainesville FL Bosch Master, ASE Master, L1 33 years MB technician |
#4
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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.
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joel Prayers bring forth enlightenment. |
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