Question about 1991 Mercedes-Benz 420

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1990 420 sel hard to start only after driving and letting it sit for about a half hour

I am completely frustrated!!! I have to return to my mechanic 6 times to try to fix my hard start problem, it only does this when it has been running and driving for a while and then when it sits for about 20min to an hour I have to crank it at least twice and then when it final starts it vibrates very bad and finally start but runs rough for a few seconds then starts to run smooth again. My mechanic has replaced the fuel pump, fuel distributor, check valve, idle control valve, 02 sensor, fuel regulator valve, and all new vaccum hoses, coolant temp sensor...I'm now $1,300.00 into this and I'm not very happy with my mechanic!!! Someone please help!!

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  • scott huffman Apr 20, 2013

    Sorry, I forgot to mention it starts perfect when cold, so i guess the cold start valve would not be the problem...my mechanic installed a used fuel regulator, I have a good feeling that's the problem, not to mention my mechanic is not as great as he says he is far as knowledge of the older Mercedes.

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Posted on Apr 01, 2009

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SOURCE: engine shut down after 15miles then won't start for half hour

just went thru the same think wit a s 430 it was the crank position sensor . 60 bucks at auto zone and it took me 5min. 2 install if u need help feel free to call me 918 808 9706 chris

Posted on May 15, 2009

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Posted on Jun 01, 2009

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