2004 (w211), E220 idles but does not rev or accelorate (PLEASE HELP)

[C a r s e]

Hi everyone thanks for your time:

My 2004 E220 (W211) CDI can idle perfect for hours on end but when I rev it up over 4000rpm and let off the accelerator the car starts choking itself and cuts out. Then after leaving the car for 10mins it starts first time and can idle for hours again????

I have taken the car to a Mercedes specialist who had the car for 3mths trying to fix the issue, but couldnt fix it.

What he tried:
1) Four injectors got refurbed
2) Removed EGR Valve + inspected operation but all ok
3) Fitted a secondhand turbo (from a working car)
4) Remover exhaust and started but still the same
5) Removed EGR valve and started found a lot of black soot returning back from exhaust!?
6) Also swapped high pressure fuel pump + fuel rail + Injectors off another car (From a working car)
7) When you go into actuations with STAR machine and open EGR valve the car cuts out i.e chocking itself on its own exhaust gases

I hope someone can help me.......

 

[evdok]

Sounds like an air problem, I'm sure some spark will help you shortly.

 

[joe prosser]

I too think it is an 'air' problem. At idle the EGR stays closed. Correctly your engine cut out when the EGR was commanded to be open - the influx of exhaust not only alters the air mix in the inlet plenum but also compromises the inlet plenum vacuum which in turn denies any relief to the fuel pressure relief (FPR) valve on the fuel rail. A double whammy actually as A) the inlet air is now reduced in oxygen due to addition of exhaust gas and B) the idle mix is now too rich due to no vacuum acting on the FPR. The engines dies as it it is flooded with too rich a fuel mix. My thoughts now turn to pressure detection in the inlet plenum. At idle there is a vacuum and the turbo is not spooled up. Conversely when the engine is at high revs the turbo is spooled up and the inlet plenum experiences over-pressure. If that pressure increase is not sensed correctly the injection regime will be wrong resulting in incorrect fuel mix. Explore the inlet MAP sensor connector, wiring and function would be my next step.

 

[BlackC55]

Could there also be an issue with the inlet port shut off?

 

[C a r s e]

[FONT=&quot]Hi, thanks for your reply I appreciate any help to get my car back on the road after three months.

Re:Explore the inlet MAP sensor connector, wiring and function-[/FONT]
[FONT=&quot] Is this something I could check myself or will it be better to take to an auto electrician OR would I be cheaper buying a MAP sensor and putting it in myself?[/FONT]
[FONT=&quot]I’m not a mechanic but I can be fairly handy when it comes to DIY repairs,
[/FONT]
[FONT=&quot]Thanks again.
[/FONT]
[FONT=&quot]
[/FONT]

 

[C a r s e]

Could there also be an issue with the inlet port shut off?

I have now manage to locate the inlet MAP sensor, and even swapped it with one from dads car, but still the same issue

Where is the inlet port shutoff located?

 

[C a r s e]

Hi,

Im still having the same issue with my E-class.

One thing I never mentioned is that it seems to run a little better when warm.

Doe anyone have anymore ideas, or know someone I could take the car to?

 

[sspeed]

Hi,

Im still having the same issue with my E-class.

One thing I never mentioned is that it seems to run a little better when warm.

Doe anyone have anymore ideas, or know someone I could take the car to?

Fuel filter...

 

[C a r s e]

Ive tried replacing the fuel filter and even drained all the diesel tank but no joy

 

[E270 Owner]

As you have access to spares from a donor car .......... it might be a partially blocked intercooler restricting airflow at max rpm, might be worth swapping it over to test.

Failing that.........

Seems like you have done everything else with the exception of an ECU re-flash.

Personally I would start at the air box and swap sensors following the airflow to the inlet manifold, not ideal method but
sometimes even Star wont help you as much as you think it might in diagnosis and can send you on a fools errand, experience often stops this though
before the bank balance does.












.

 

[C a r s e]

Hi,

I am still having the issues with my Mercedes, its lying depreciating in the driveway.

Im not brave enough to remove parts from my w209 which is rinning.

Does anyone know someone in the Edinburgh area who would be able to have a look at it for me, without costing me too much

 

[C a r s e]

Since my Mercedes has been lying depreciating in the driveway I have decided to sell it, if you are interested in buying it please see link below:

2003 MERCEDES E220 CDI ELEGANCE AUTO, Needs Attention, diesel, outstanding cond | eBay