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'83 380sec'87 420sel
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8 Posts
Discussion Starter · #1 ·
Idle control valve on '87 420sel. Is it suppose to hum when you have juice to it or is it suppose to click? I have extremely low idling rpm (500)and pulls a lot of vacuum (half the gauge). I disconnected the wires and from a cold (30degrees F) the engine started right up and idled about 1000rpm and not pulling any registered vacuum. After about a minute, and at which time I pushed on the gas pedal and reved the engine the idle dropped off to 500rpm and pulls the vacuum. I checked the voltage at pins 9 & 11 (12volts)which is ok. If I check continuity across the the two leads on the ICV it shows a short. I don't know if this is all right? Can someone enlighten me, please.
By the way I have virtually read all the 30 pages of this forum and like how people respond. Too bad other makes don't have the samething going. All of you are great. Problems and all. Thanks[:)]
 

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87 420SEL, 91 560SEC, 78 280SE 4SPD, 01 CLK55, 07 CLK63
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212 Posts
Same issue on mine. The mechanic tried to clean up the idle control valve but that made the issue worse than before. Did you figure this out?
 

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SuperModerator
1986/1990 W126
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17,172 Posts
Nice to see people searching though.
 

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Registered
87 420SEL, 91 560SEC, 78 280SE 4SPD, 01 CLK55, 07 CLK63
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212 Posts
I created my own post about the issue which has zero replies :(
 

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1989 300SE 239k miles
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2,558 Posts
Mmmmmmm… Feel ya. If you’re talking about your post about the O2 sensor and trouble starting, I read that. To me, the O2 light being on makes it a very different beast. And I have no experience with them.
 
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