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Old 06-27-2003, 04:48 PM
Registered User
Join Date: Jun 2003
Posts: 6
Engine Choke Stuck. Idle high

Hello, I just posted a thread about my situation on my 1987 420EL. Im not sure if it was clear what the problem was so I've decided to reword my post. When I go to start my engine, the car starts up and automatically starts idling at around 1500rpm. When I put it in drive it slows down a little but its still abnormally high. It can go up to 40mph without me having to put my foot on the gas. I looked in the engine compartment and I saw that the choke was stuck. Is the problem Im having could I be able to fix it myself? Im afraid to go to the MB service center because I dont like the fact of them repairing your car and charging you ridiculous prices for a small broken item. If you have any tech tips and suggestions please respond. Im not up to date with all these abbriviations so please could you explain to me. Thank you.
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Old 06-27-2003, 05:39 PM
Registered User
Join Date: Mar 2003
Location: Southern California
Posts: 2,011
Choke??? KE systems don't have a choke in the conventional sense like a carburetor. The idle speed and mixture, cold or hot, is controlled by the electonics via the idle speed control valve and electo-hydraulic actuator.

The first thing I would check is the throttle position switch and linkage microswitch, and the linkage, too. After this the idle control valve and then the air flow valve potentiometer.

There have been many recent threads on these issues, so a search should provide a wealth of information. The KE system on the all late eighties engines - four, six, or eight cylinder are the same technology, have the same components, and the same problems, many of which are simple to correct.

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Old 06-27-2003, 08:34 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Temp sensor is bad or the idle control valve or ciruit is shot.

What you thought was the choke is the air flow sensor, don't mess about with it, you'll break something.

Make sure the idle control valve is plugged in (small cylinder about half the size of a soda can, two wire plug, two rubber hoses about 1/2 ID). Make sure the hoses are attached, too! Idle speed goes high and stays there in "limp" mode.

If not that simple, you will need a shop, probably, to help you find the problem and fix it.

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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