John House

I have recently purchased a 2000 C240 auto sedan with 81,000kls on the clock,I have been experiancing serious (dangerous) acceleration issues in the morning,it simply will not accelerate until it reaches 20-30ks or about 1500-1800 rpm,this problem only occurs in the morning and will continue even after the car has warmed up,if I go out at lunch time it is fine or if I go out at night it is fine.I have pulled over on my way to work,turned the car of and re started it and the problem still persists,to prove a theory the other day I did not take it to work and when I got home that evening I took it for a drive and it was fine,please help!!

W203E35

Have you ever changed the fuel filter? Sounds to me it's the fuel filter.
How about the transmission? Have you ever changed the filter and transmission fluid?

John House

Why would it only do it in the morning ??

W203E35

Bottom line is it seems fuel related. It might be fuel filter or it might be dirty injectors. If you never changed the fuel filter I say now would be the time. The 45.00 US dollar fuel filter will save you from more trouble and even worse maybe even an accident.

W203E35

The cold and hot might play a role in expanded gases. Maybe the gases in the fuel are expanded during warmer climate and feed fuel better. Or it might not even be due to climate, it might be in the morning lack of fuel being delivered and when you drive, stop, park then start car the fuel is still there.

John House

As I said I have only recently purchased the car,so I have no idea how long ago the filters were changed,but I am still at a loss as to why it does not do it in the afternoon or after not having been driven all day.I am going to the dealer next week so I will pass this on,thanks Karo

W203E35

Well one way to test it is, put the car in Park and press the gas. If you get the same result then it's for sure the fuel filter. Good Luck

Again the easiest way is to hookup Mercedes Diagnostics System (SDS) and see if you have any fault. The dealer should be able to figure it out. Keep us updated on how it goes.

samaritrey

Ok was it built in 2000 MY 2001? there is no 2000 c240 W203.
BTW where do you live?

John House

I live in Australia,this afternoon on my way home from work the car showed the fault,this was the first time it has done it other than in the morning,on this occasion I stopped and re started the car and it rectifyed the issue,another first

Glyn M Ruck

Welcome

You need to systematically check all these issues:

The following all need to be completely as new.

-Clean air cleaners
-Spotless & operating to spec MAF
-Spotless & operating to spec Throttle Body
-Clean inlet system & no valve tulip deposits - 112s can get awfully fouled in inlet manifold & flaps
-Decent, clean, low mileage plugs
-Good plug wires
-Coil packs at required voltage with no earth flash overs.
-Perfect CPS
-Clean fuel filter (proper fuel delivery)
-Fuel pump & sensors up to spec so that that injectors see correct rail pressure. Fuel tank & systems in good order including EECS
-Clean and undamaged injectors
-Vacuum systems in good order with no leaks & no leaks on MAF or TB rubbers
-02 sensors cycling fast enough
-engine temperature sensor properly earthed & reading correctly for correct starting/running mixture

Of course engine in good nick with adequate and even compression. No leaking valves or stuck or damaged rings.

I am suspicious of your 02 sensors. They can cause this sort of stumble but so can many other things.

Are you sure that the car is not going into limp mode?? Could be why the problem rectifies itself on a reboot.

You need to get hold of an OBDII/CAN scanner & check for stored codes.

Good luck

Trey - SA & Aus saw W203's from 2000. This car could have been built in South Africa.

samaritrey

were they 2000 model year or 2001 Model Year.

Glyn M Ruck

MY 2000 - US got W203 later than ROW. Will post pdf. when system allows. Having router/DSL line problems.

bdgdl08

WOW! That's really interesting. I knew that alot of things were different, but I never knew we were a whole year off.

Glyn M Ruck

https://mbworld.org/forums/attachmen...class-w203.pdf

W203E35

Trey don't look at the document

samaritrey

wait i don't care what the review says i love my car
and i would have a cdi if they would bring them to the usa

W203E35

Ohh by the way Happy Birthday Trey

samaritrey

Thank You

Glyn M Ruck

Happy Birthday! - don't do anything I would not do - that should give you plenty of scope - enjoy your 320 - who cares what some Euroscribes think.