nosleep09 no

Hello, hope im in the right place. 2003 C200 AUTO. 113k on the clock. I have had for about 6 months, car was fine apart from electrical gauges freezing momentarily now n then. Recently i have had choppy acceleration like if there was a hole in the exhaust, and engine shake, but it only does this after about 20mins of driving when the temperature warms up, if i turn engine off and wait till it cools down then i start up again the car is back to normal again... Until it warms up again then i have the same issue. There is no engine management light or malfunction listed. I recently used all off wynnes cleaning products as the car was shaking and cutting out when i pressed the breaks or accelerated from stand still, i should have mentioned this first but since i used wynnes it no longer does that but it has this problem instead. Please let me know if im in the wrong place. Thanks

5by5

Hmmm, wonder if you have a crankshaft position sensor (CPS) issue.

A failing cps often only acts up when the car is warm. Often no codes either. There are quite a few threads on the site about cps issues—run a search and see if the diagnosis matches your problem.

5

nosleep09 no

Thanks for the reply, i have looked at a few of those threads but am not sure whether thats the issue. The car was initially cutting out, but after i put wynnes through it the car no longer does that. What happens is the car starts up and drives fine for around 15-20mins, then the acceleration becomes hessitant and choppy almost like as if i had a hole in the exhaust and the engine shakes. From what ive read when the cps fails the engine cuts out and wont start, but i dont have that problem

5by5

While it’s true that CPS problem can cause a quit/crank no start, it can also cause drivability problems. See: http://www.mercedesmedic.com/crank-s...sition-sensor/. CPS problems are also frequently temperature sensitive.

I have no idea what the Wynn “snake oil” did to your car. Did you do an oil system clean/flush? Fuel system treatment? Intake cleaner? Who knows...I Seafoamed the intake on a 1992 190e 2.6 once. It quit and then ran badly until I removed and cleaned the idle air control valve. Stayed away from junk in a can since then...

Key thing for me is that your problem only occurs after driving 20 minutes.
Good luck,
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nosleep09 no

I used the wynns mainly because i failed my mot due to emissions and the initial problem i had with the car cutting out, to be fair after i used that the car passed its mot and the initial problem went away, but then a couple weeks later this problem started so dont know if the wynns caused this new probllem. but i will change the cps and see if that cures my problem, ill post an update when its done, thanks for your help

benz-w203

[QUOTE=nosleep09 no;7848446]Hello, hope im in the right place. 2003 C200 AUTO. 113k on the clock. I have had for about 6 months, car was fine apart from electrical gauges freezing momentarily now n then. Recently i have had choppy acceleration like if there was a hole in the exhaust, and engine shake, but it only does this after about 20mins of driving when the temperature warms up, if i turn engine off and wait till it cools down then i start up again the car is back to normal again... Until it warms up again then i have the same issue. There is no engine management light or malfunction listed.
Hello friend, I have the same problem. Would you tell me how you solve the problem???

MercBzC240

Best way to diagnose, bi directional scanner, otherwise guess away