I have an E200, petrol, automatic, W124, built in 1994. Recently I encountered a problem with the revs of the car. The revs are not stable. The car might start and switch off or start at low revs and when the engine is loaded with e.g. with the ac or power steering and the gear the car will switch off. When started again it might do the same or start at high revs of 1500. When at 1500 it will not adjust and is pretty dangerous to stop as it will behave like the petrol is pressed at the same time that the brakes are applied. When switched off and on sometimes it resets to normal revs but still does not behave normally. My mechanic suggested a throttle replacement. Is there anything else that might cause that? like a wiring problem or vacuum tubes? Can the throttle be repaired ?  Thanks for spending time reading about my problem.

Comments

I would start with replacing the throttle body. It can be cleaned, but you it will never be the same. Unless you know an expert who respres them.

If the problem remain, check the fule pressure. The fuel pump may be acting up. Not creating engough pressure. Check fuel filter as well.

 

Let us know how it goes.

I am going to my mechanic today to replace the throttle body (found a used one eventually). He already replaced the fuel pump ( was making some loud noise after working for some time). Lets hope he solves the problem. Thanks again for your interest.

Finally the problem was solved but I waited for some time before posting just to make sure that all is ok and running.

The problem was at the connection plug of the throttle. One of the pins of the plug was broken (earthing wire) and we had to make some modification in order to bypass the plug and reconnect the wire. All is good and running now, even the AC (climate control) is operating much better now. Before, with the problem of the throttle, the AC was coming on and off at will, but now with that earthing wire reconnected it runs smoothly.

Thank you for your support

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