Mercedes C250 - Loss of power

[gngspr]

Checked a 202 Mercedes C250 TD (1998) for loss of power - fault code P1470 - Turbo Intake / Boost.
The actual problem is that vehicle loses power 70 m/ph +
I have replaced turbo (seals found to be leaking) and also the wastegate solenoid (Mercedes call it a pressure controller). Vehicle is better but still loses power at higher speeds.
Can anyone help/suggest any common problems?

 

[Parvez]

Hi I have had a similar problem today. I have a 1998 C250TD and have lost power on acceleration from start, however once I gain speed on the motoway, I am OK but do not have the "umph" !!
Anyone any thoughts please? It could be the turbo however not sure how easy it is to replace and what spares cost...
thanks
Parv

 

[sss100uk]

C250 TD 1998 Loss Of Power

ive bought a C250 TD 1998 just a month ago and im having loss of power from the start. i wont pick as fast as it should and after going about 60+ it starts to slow down in picking up speed and the max ive hit is 85 mph which is crap for a 2.5 TD. ive had the turbo checked and works fine. any ideas as i was reading you have experienced the same problem long time ago. thought u might have a solution. cheers

 

[230K]

Hi

Taking air at the plastic fuel lines?? Just a thought or dirty filters.

230K

 

[sss100uk]

Thanks for the reply. i have had a full service when i bought the car a month ago. i changed the fuel, oil and air filter so the filters isnt the problem. will have a look at the fuel lines. but shouldnt the engine jerk or cut out at some points if not enough diesel is going through. correct me if im wrong. i dont know much about cars to be honest.i just know the basics.

 

[mstar]

with all things i have given up on my C250 td, i been told by my benz service garage nothing is reported in loss of power etc, and i have looked at all obvious things so i am just fed-up now and just put up with lack of acceleration, but then again i ever driven another c250 td to compare

 

[Parrot of Doom]

Whats the 0-60 time, compared to the book time?

 

[Rob973]

Sluggish

My 1998 C250 has started to be a little sluggish too. I had a major fuel air leak problem which required most of the fuel pipes replacing and the fitting of a one way valve. However it is still not as it used to be and a little noisy over 80mph.

 

[Rob973]

Test Drive

M-Star if you live anywhere near Southampton then maybe we could compare the two cars for speed

 

[Sprint'n'Go]

Read every thread you can find on this forum relating to MAF/MAS sensor. It seems it can cause a myriad of symptoms and the common thing is no fault codes but erratic power delivery. This problem could apply to all of your cars and if you read Parrot of dooms excellent piece about cleaning it you may be able to solve your problems cheaply and simply.

Good luck.

 

[230K]

Read every thread you can find on this forum relating to MAF/MAS sensor. It seems it can cause a myriad of symptoms and the common thing is no fault codes but erratic power delivery. This problem could apply to all of your cars and if you read Parrot of dooms excellent piece about cleaning it you may be able to solve your problems cheaply and simply.

Good luck.

Hi

The C250TD your chatting about doesnt have a MAF me thinks... but then again i was wrong before (once).

230K

 

[c250 turbo diesel]

suggestion

Had the same problem with mine when first got it, The oil seals on the manifold were replaced, all of the plastic fuel pipes on the fuel system replaced, all done in the merc agents, still would not pull the skin of a rice pudding !

So decided to check all myself, and to be honest I found the problem by pure fluke ! I took all the plastic air ducts off from the top that I could, all ok o rings in tact, then droped a long extension bar down the side of the engine.

Oh well I thought the only way to get it was take off the plastic noise gaurd underneath, so up on the ramps and off with it, found the bar ok, and to my amazement the bottom air duct was not connected on the up position, the jubilee clamp at half mast.

Put this back on tight, and tried the car, of course you gueesed went like S..t off a shovel, and has to this day.

Incidently I took it back to the Merc agents that did the other work, and said "what mechcanic did the work", our best man he said !, and dont forget they have all the testing equipment.

He then told me I should not have put the pipe on myself, only brought it down like it was for them to see, or excess pressure may have blown it off,

Yeah so likely, as they had just tested it, these b..st..ds will tell you anything, as long as the take there high hourly rate, and if you have an older merc have very little interest in you at all, best find a good independant.

I gave him and the service manager the biggest ear bender they had heard, and was told "dont come back" I said dont worry I never will !

I suggest anyone who has these cars, dont give up, because all of the above things I have mentioned are not big jobs, and when you have got them all right they go really great,

Ie the manifold o rings, makes oily engine and clogs up ducts, the plastic fuel line bad starting etc....................C250 turbodiesel "great car"

 

[mstar]

thanks for that insight great write up, to be honest, we never really know if someone working on our cars has done a good job, as normal joe public like us are not technical enough. Finding a honest MB dealer/independant is almost impossible as u got to remember they are a profit organisation at the end of the day.

 

[David Massey]

with all things i have given up on my C250 td, i been told by my benz service garage nothing is reported in loss of power etc, and i have looked at all obvious things so i am just fed-up now and just put up with lack of acceleration, but then again i ever driven another c250 td to compare

Try replacing the brake switch on peddle before lokking at the gas flow monitor...once i had the gas flow monitor changed it was sorted!

 

[sss100uk]

Loss of Power

it took me a while to figure out my problem but it was a sensor that is sitting by the inlet manifold that was faulty, error code P1470. there is a vacuum pipe going from the inlet to this sensor and also has a power wire connecting to it. drives perfect now.

 

[BlackC55]

vacuum transducer.

 

[television]

Thanks for posting back on this one, it will help someone else

 

[sss100uk]

Loss Of Power

it wasnt the vacuum transducer valve, its a inlet manifold pressure sensor

 

[poisas]

hi, i have some kind of issue also, got P1470 in diagnostics, so what could i check to to see whats wrong here ?

MB W210 E250 turbodiesel 1998

 

[Richardtoo]

I had a problem such as this with a 1999 C220 CDI that I had for a while. Finally after much fiddling I went to the main agent and he just plugged back in a 6mm dia plastic tube that had become detached. If you look under the bonnet front right there is a large hose, air hose I think, something to do with the induction. Just near this there is the 6mm plastic tube. It had detached at one end. This tube gives a signal to the turbo to let it know all is well, with I know not what, but it certainly went back to full performance after reconnection.
Be careful how you route it as the movement of the engine will detach it again.
Hope this helps. If not good luck.
Happy New Year.