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Old 01-18-2007, 09:45 AM
mmansilla's Avatar
Registered User
Join Date: May 2006
Location: Santago, Chile
Posts: 12
Low Idle, 230E

Suddenly my reliable euro 230E (W124, M102) began idleing low when starting. It used to idle at 1100 rpm in cold starts, and soon it fell to 750 rpm. That was what I considered normal.

But now it idles at a weak 500 - 550 rpm when it starts, and hesitates. After a moment however, idles at a normal 700 - 750 rpm. This happens specially when cold, and after the initial weakness the car runs and idles fine.

I suspected that the ICV was not providing the additional air the engine requires when starting cold, so I cleaned the ICV and applied directly 12v to it. It made a loud click, which I assume is indicating that it opens as it must be, and it leaves me without theory.

Can someone please suggest me what else to do to diagnose this problem?

Thanks for any advice.

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Old 01-18-2007, 11:41 AM
david s poole
Join Date: Mar 2005
Location: dallas
Posts: 1,822
what year is the car? poss voltage protection relay problem. car could be in limp mode [when idle valve not getting any voltage]
David S Poole
European Performance
Dallas, TX

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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Old 01-19-2007, 10:00 AM
mmansilla's Avatar
Registered User
Join Date: May 2006
Location: Santago, Chile
Posts: 12
It's 1992, and the OVP realy is original. After I saw your post I thought that whatever the idle problem is, the relay needed to be replaced, as maintenance. So I bought a new one and installed it today. The problem disappeared.
Many thanks for your help.

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