320CDI Missfire WhenCold????

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RabFJR1300

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Joined
Aug 13, 2012
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2
Car
CLK 320CDi Sport
I've a lovely CLK 320 CDI that has developed an irritating fault. On start up if I use too much right foot I get a missfire the engine hunts it's like switching the ingnition on and off again and again. I can only use small throttle openings until the engine is fully warm. Once up to temp she runs fine. I know there are no fault codes.
Rab...
 
MAF is gone and needs replacing,I had that issue with my last merc
 
Glow plugs would give the fault light/code, glow plug relay not every time, but I don't believe it would affect like that. MAF is a good guess, also leaks in EGR system or jamming turbo actuator. No codes are always shown.

Then one more thing is rail pressure, if pump/injectors are leaking heavily, pressure may fluctuate, but warming will change tolerances so leak is decreased. Usually they cause also hard starting, how long cranking is needed?

You should get car plugged to the star when engine cold so all parameters could be checked when problem is on.
 

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