95 S 420 gets hot and runs rough
Thread Starter
Newbie
Joined: Jan 2011
Posts: 11
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1995 S 420
95 S 420 gets hot and runs rough
maybe some one can help me out here, when i start the car she will run fine and then once she warms up she will run rough and cut off and you have to wait 20 min to restart and then it will run fine for a couple of days but if i let it sit for about a week it will do it all over again, it will stumble and backfire, and loose rpms, i have put a new wiring harness on new coils new crank shaft postion sensor, but this problem is driving me 
i need help here
i need help here
Newbie
Joined: Aug 2011
Posts: 9
Likes: 0
From: North of France
w140 - 500 SEL
perhaps the wiring harness (if my traduction is good) who is very bad on this generation of cars.
so, the plastic of wire break and there is short-circuit or/and the heads of distribution with the fingers.
I had this type of problem on the v8
so, the plastic of wire break and there is short-circuit or/and the heads of distribution with the fingers.
I had this type of problem on the v8
Thread Starter
Newbie
Joined: Jan 2011
Posts: 11
Likes: 0
1995 S 420
i have cleaned the maf sensor put on new coils and i have put on a new wiring harness this is driving me nuts, it will start up and run great then once she get hot she will stumble and run rough and cut off if i try and start it back up it will back fire miss and will not start if i wait about 30 min it will start up and run fine for a couple of days and then it will act up again and i also put a new crank postion sensor in also
MBWorld Fanatic!
Joined: Jun 2010
Posts: 1,246
Likes: 52
From: tennessee
s320
Some maf sensor are not good the cheap ones.Plug wires?Or plugs?Oxygen sensor first one.
Or oh know Gets Hot and Runs Rough Head Gasket.
Or oh know Gets Hot and Runs Rough Head Gasket.
Last edited by oldsinner111; Aug 22, 2011 at 06:27 PM.
