e320cdi power loss/gears

[r10crw]

Hi Guys, got a strange question for you. Ive got an e320 cdi thats lost lots of power. From start up I can nail the throttle then at 2k it changes up constantly until in top then accelerates as if its only got 100bhp. I replaced the MAF sensor last year after a very different loss in power, then later last year I had to change a big senor plate? in the side of the gearbox, but thats because it was locking down into third or fourth, again different symptons. Anyone got any ideas? Thanks Craig.

 

[Dieselman]

Check the MAF again. Was it a genuine Pierburg MAF or a copy from ECP?

If the MAF is ok check the boost pressure and that the wastegate is being held closed and the vane ring is moving Ok.

You might need the codes read to find what the fault is.

 

[r10crw]

Thanks for the reply, the maf sensor was not genuine. Is there away to tell if its working without getting a new one? also would this affect the gears? Looks likeill have to find someone with a code reader. Thanks again Craig.

 

[Dieselman]

No further diagnosis needed, it'll be the MAF.
Just buy the gen item from your local dealer for £50 and get your money back from ECP.

You could meter the output from pin5. It's a chopped sine wave but will register on a DMM. It should be about 4.5v at full chat.

That will affect the gears as the maf senses the load the engine is under.

 

[KLP 92]

ECP supply Pierburg MAS, its the same as the MB ones, same part numbers etc.

I bought a new mas sensor that was faulty, and it was a genuine one.