Question about 1987 Mercedes-Benz 300-Class

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I have a 1987 mercedes 300E that stops running while driving or sitting at a light, all electrical still on, what could it be?

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I had this once, get the car running and turn the ignition key very slightly and very lightly from side to side while the engine is at idle, this may show up a faulty ignition switch if the engine cuts when you're turning it.
Also the ecu on the nearside inner wing may be at fault, see if you can find a friend with the same car to try swapping over to his first to test as they are expensive is this isn't the problem.
Finally, a common fault with these cars is the fuel pump relay, its the biggest black plastic covered relay in the fuse/relay box, at the rear of the front offside inner wing area.

Posted on May 23, 2009

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Posted on Jan 02, 2017

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