ML 270 Rough running

Page may contain affiliate links. Please see terms for details.

sappers

Member
Joined
May 23, 2016
Messages
31
Location
Bracknell Berkshire
Car
ML270 CDI
Hi, quick question from new owner. I have an ML270 2002 CDI and it runs great when cold. When warmed up it will run to 2000rpm then sounds like the timing is off (as if it was a petrol model) and huge clouds of black smoke. A bit gutless until it gets up a bit of speed, say 70mph and then it's off like a train. Any thoughts? Recently had fitted new inlet manifold and swirl flap motor, gearbox fluid, filter and contact plate and a new battery.
 
No, nothing at all. Had it plugged in a couple of weeks ago and flagged up all the above problems but no lights or anything this time. I have plugged a generic wifi adapt or in and used an iPhone app but still no codes stored or pending. Does anyone know when the turbo starts to spool up and boost; wondering if this was related to 2000rpm.
 
Should have boost at roughly 1600rpm and from 2000rpm really pulling well.

I had a similar issue, no power or boost when warm and lots of black smoke which was caused by a bad MAF.
 
Thanks for that. I will try and find the specifications for the MAF and go from there. The only thing I know for sure is that it's not a genuine part.
 
The MAF I removed wasn't a Mercedes part but I replaced it with one which has made the difference. Even with the bad MAF, mine still sounded the same. Maybe a video of the sound would help?
 

Users who are viewing this thread

Back
Top Bottom