Spasmodic power loss

[Johnmccormack]

W211, 2003 E270CDI. Normal driving the car frequently seems to lose power eg today, flat road power went, floored throttle at just under 1200rpm and 40 mpg, it took 25 seconds to reach 1550 rpm and 52 mph. Ten minutes later it suddenly worked perfectly, floored throttle and it leapt forward.
(Flooring throttle is not normal practice, only when this problem occurs).
Has anyone any experience of this, or can make an educated guess?
Many thanks.

 

[Taffy7hfa]

Boost leak ?

 

[Johnmccormack]

Boost leak ?

Que?
Sorry Taffy, Being completely non tech or mech I'm afraid I don't understand ( I do get the concept of a leak but the where / how / why of "boost" in the context of the problem eludes me.......a bit more context / detail might help if you'd be kind enough? hanks

 

[bembo449]

no EML ? could easily be a partially blocked EGR or MAP sensor or the MAF playing up

 

[Taffy7hfa]

Hi John, compressed air, (also known as boost or charge pressure) being produced by the turbocharger can sometimes leak out through splits or breaks in the pipework between the turbo and the inlet manifold, it is a fairly common problem and can produce symptoms similar to yours although... as above there are various other possibilities.

 

[Johnmccormack]

Hi John, compressed air, (also known as boost or charge pressure) being produced by the turbocharger can sometimes leak out through splits or breaks in the pipework between the turbo and the inlet manifold, it is a fairly common problem and can produce symptoms similar to yours although... as above there are various other possibilities.

 

[Johnmccormack]

Hi Taffy and Bembo, many thanks for your comments, sorry it's taken so long to reply but i'm waiting to see one of my son's mates to decipher the acronyms !! EML, EGR, MAP, MAF....unfortunately that could be Klingon for all I know. I'll bounce them off him and when I understand (?) i'll try coming back......hope you have the patience! Thanks again