e320 cdi power loss

[ColeS210]

Hi,
I'm having problems with my S210 e320 cdi (200k miles), it's seriously lacking power. The car will accelerate quite normally up to about 30-40 miles per hour but then just seems to really struggle to gain speed. The car doesn't want to rev up and has no power top end, it struggles to rev up over 2.5k rpm. Even when driven in manual mode the car struggles to rev up which makes me think that it isn't a transmission based problem. The kick down also isn't working and causes a warning and malfunction to be displayed.
The car produces black smoke under heavy load also.
When checking error codes, nothing comes up apart from the direct sunlight sensor which is unrelated. The car was recently serviced and the MAF sensor was changed a couple years ago.
I took it into a garage and they said to run a fuel system cleaner through it and give it a good run but this hasn't solved the problem at all.

Hoping someone has had a similar problem and can help me out in finding what the problem may be.

Thanks,

 

[Craiglxviii]

Sorry, cannot help but will watch this with interest as I'm looking to buy one myself.

 

[bob 6600]

MAF could have gone again - was it a genuine MB or OEM Pierburg? If neiither then I would bin it and replace it with a genuine one.

 

[ColeS210]

Yeah it was a cheaper OEM sensor. That could be the problem. Although when I needed the sensor changing before I got error codes, now nothing.

 

[V6Matty]

sounds like a boost problem rather than MAF, have a check for splits and even the actuator for the turbo is working.

 

[om613]

I had similar faults with mine.
Kick down resulted in the EPC error message (caused by the TPS)

Limp mode was caused by the inlet flap motor being shot. Fixed successfully with the resistor bridging mod!
My EGR valve was also seized shut, which will also cause limp mode.

 

[Naraic]

EGR is dirty I suspect.

 

[om613]

Don't throw parts at it like I did. Get a Star diagnosis done. There's too much of an interplay with limp-inducing faults on these cars.

(BTW, I had all the parts anyway. The car was also off the road as a project)

At 200K, if the EGR hasn't been done... it'll be very crusty.
The EGR delete mod is good, unless you've a B***** D6 box fitted.