W202 c250 td

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Dieselturbo1

New Member
Joined
Oct 13, 2018
Messages
4
Location
Pretoria
Car
Mercedes benz c250 turbodiesel
Hi guys im new here got a strange problem with c250td it doesnt boost like it should it boosts when first started only starts boosting at 3,300 for the first 3 gears then nothing after that nor does it change gear if i gas it, any ideas please
 
Have you plugged it in and read the codes?

Worth checking the pipes to the MAP sensor on the bulkhead, intercooler pipes all ok?

Does it black smoke heavily?
 
Yeah best thing to do would be to get it out on MB Star diagnostics. You’ll need someone with the HHT (Hand Held Tester) software or another reputable diagnostic tool which can connect with the 38 pin interface.

That way you can check it for fault codes to prevent the guess work. And all the parameters can be checked/tested to make sure they are working accordingly. It would be the easiest and quickest way to find the fault.

Sounds like the engine or your transmission is going into limp mode and many things can cause that.
 
Black smoke heavy on boost got no codes im thinking vacuum or air blockage
 
At what rpm should these mercs start boosting?
 
Have you checked the basics, air going into the turbo clear and exhaust clear, wastegate vacuum pipe?

Have a look underneath at the two intercooler pipes and check if they get 'fat' when revved?

Will be on boost around 2000rpm, way before 3300.
 
They do not puff up when revved turbo and exhaust seems clean, i think ill get the exhaust replaced at a stage .
 
Check the integrity of all the rubber hoses in the air system. Even a small leak will detrimentally affect the performance.
 

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