Question about 1998 Mercedes-Benz C-Class

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1998 C180 Sport Automatic choke faulty

Recently had vehicle in to be tuned, but now it seems to take forever to warm up and i dont think the automatic choke is working, I live in an out of the way area and need some advice on the choke circuit or a diagram so that i can get it fixed locally.

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If it's fuel injection I don't think it will have a choke. It will have what they call an Idle Air Bypass valve or something of that nature. If you can find it take it off and spay Carb cleaner through it. Be carefull not to get it in your eyes. I'll do some research and see if I can find a photo for you. A lot of the time they get dirty and just need a good cleaning.

Posted on Aug 13, 2008

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I have an intermittent high idle problem with a fully warm engine. I had it put on a scanner and no problems except for a faulty fuel sending unit. Do you have any advice?


Hi Danny;
You don't say what vehicle it is which might helpavoid irrelevant answers. If the vehicle has a standard carb with automatic choke, try buying a can of carb cleaner. Instructions will be on the can. In particular, check the choke to ensure free movement, Could be that it is just gummed up a bit.
Here's a gret link that will help if the problem is a throttle position sensor.
http://www.buzzle.com/articles/symptoms-of-a-bad-throttle-position-sensor.html
Hope this helps.

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Carburated vehicles ether have an automatic choke, or the very old ones, a hand choke. Yours has an automatic choke. The starting problem likely is a problem with the choke. The problem is almost certainly not the fuel pump.To set the automatic choke, push the accelerator to the floor, and RELEASE. Then start the engine just like you would a fuel injected vehicle. If this doesn't solve the problem, then the automatic choke needs to be repaired.

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The problem may also be the automatic choke. It could be stuck in fast idle. check all choke settings and linkages clean if nessesary. There is a separate fast idle adjustment screw on the choke linkage that controls engine speed while the engine is warming up. The tip of the screw rests against a cam that slowly rotates as the choke opens during engine warm up. Turn this screw counterclockwise to decrease the fast idle speed.

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