C220 CDI cuts out under acceleration

[dieselman]

P1187-032 Rail pressure monitoring Control variation.

This won't be the MAF or injectors as the engine has started.

If not the pressure control valve it might be a blocked filter or leaking air in under load. Check the tank strainer and all filters/pipes.
Try running the engine from a can connected straight to the lift pump so bypassing all filters, strainer and pipes.

 

[Alex Crow]

it is possible it is the high pressure pump, this is thought to be less likely than leakoff - but they have ruled leakoff out? and the o-rings on the pressure regulator too as above need checking.

 

[mbyrnes]

Hi again,

I've been assured by the people working on the car at the moment that all mentioned is this post has been tried. They were in the process of taking off the high pressure pump to check it although the pump had already been off and swapped with a pump from a similar car and this did not solve the problem. Now I have just got off the phone to another mechanic who reckons this is being caused by the turbo and probably a turbo sensor! Does this make any sense to you guys?

Thanks,

Michael.

 

[dieselman]

Now I have just got off the phone to another mechanic who reckons this is being caused by the turbo and probably a turbo sensor! Does this make any sense to you guys?

Thanks,

Michael.

It might for power loss and limp home mode, but not for a complete cut out.

 

[Alex Crow]

rail pressure control faults (as in your recurring fault code) cannot be turbo related, although some do mistake rail and boost pressure they are two completely different things!

 

[mbyrnes]

Hi,

Spoke with garage again this evening and they had taken the pump off for inspection. Guy said he had never seen a pump so worn or showing signs of age and wear. They are now in the process of reconditioning and rebuilding the pump and are confident this will resolve the problem. Fingers crossed and hopefully this will be the final leg of the saga..
Thanks again for all the advice and help. Will update as soon as I know more.

Michael.

 

[mbyrnes]

Hi,

Car fixed and running like a dream. Bought this car from a (cowboy) dealer in South London in Jan and drove it properly for the first time today. Turned out to be the pump but the condition of two of the injectors made finding the problem more troublesome. Anyway thanks to all who posted and replied to this post. Great forum with great people.

Michael.

 

[mymelt8]

I had this exact problem on my 2002 270 cdi. It was a faulty injector seal causing low fuel pressure. New injector fitted 40k ago and no problems since.