Hi jacques here from south africa..

[Durecell]

Have a w204 cdi 220 646 engine.
Keeps telling glow plug module faulty.fitted new glows plugs etc..
Car battles to start wen hot or cold and goes into limp wen accelerated hard for about3km...anybody had similar problems

 

[Blobcat]

Hello and welcome

 

[SmartAmg]

Welcome.

 

[A.J.]

Hi and welcome to the forum

 

[Steve@Avantgarde]

Have a w204 cdi 220 646 engine.
Keeps telling glow plug module faulty.fitted new glows plugs etc..
Car battles to start wen hot or cold and goes into limp wen accelerated hard for about3km...anybody had similar problems

Have you checked whether there is power to the module?

A glow plug fault of any discription wont cause a poor starting (unless you are at -10'c air temperature) issue or limp mode situation. I would say you need to carry out a fault code check and post the results here.

 

[Srdl]

Hello and welcome

 

[dry run]

Welcome

 

[Botus]

a few common things

VGT actuator on the turbo (should wobble as you start and blip the throttle - linkage should be free to move - u can get gunge to clean out the gunk)
Boost pressure sensor - wrongly called exhaust back pressure sensor (tells above how to behave - £40 - live data should give funny data if dead)
EGR blocked / broken (stupid money - makes it run well in the cold and makes the heater effective)
Swirl flap motor seized (often shares the same fuse with the VGT actuator - this device is a waste of space and can be nobbled for 10p)
Boost hose pipe ruptured (should be able to hear the boost leak)