HI can anyone help ,1988 e 230 runs for 10 kilometres and soon as a set of traffic lights appears, it idles and starts to run rough, then cuts out,unless you hit the gas with foot on brake and out of gear, car has only run 50.000 km , when you restart it , it runs fine until next traffic light.

 

There is another guy with this same problem at present on a SLK 230.
Not sure how similar your vehicle is to his however since it is much earlier.
Generically speaking,
Ist suspect is fuel pump relay situated in the engine electrics box.
2nd suspect is Crank Position Sensor located on bell housing.
Stuart

 

thanks for your reply, what is a Crank position sensor and what does it do. where does the fuel filter fit ? is it near the fuel pump, thanks again for you help

 

I know very little abouit such an early car. My knowledge is of a more generic nature.
The fuel filter is usually situated adjacent to the tank and beomes visible with the vehicle on a ramp or possibly with a wheel off. However it could be elsewhere on your car . I just don't know.
A CPS is a sensor that determines the angular position of the crankshaft. i.e. vs Top Dead Centre. This is required in order to tell the engine management system......not sure what level of electronic wizardry your vehicle has......when to fire the spark. UIsually situated on the bell housing or sometimes near the crank pulley. Are known to give problems once warm or subject to vibration, although the problem can actually be due to particle build up on the tip sensor which can be wiped off.