Engine hunting at a steady 30mph

Bingy

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Joined
Oct 3, 2015
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60
Car
C220
My W203 facelift c220 cdi

when driving along at a steady 30mph the engine hunts and the revs go up and down slightly.
Tickover is fine , Acceleration is fine as well as kickdown, it is just at a steady 30 or 40 mph the revs go up and down and you can feel the car in sequence with it.
 
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Bingy

Active Member
Joined
Oct 3, 2015
Messages
60
Car
C220
Does anyone have any info that might help?

Also meant to say it is a 2004 (54) plate
 

paul73mt

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Jul 18, 2012
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679
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Essex
Car
2010 C350 CDI Sport sold , 2015 E250 CDI AMG Line Sold
I have this I think, some have said the valve body in the gearbox could be faulty but an Indy has said to be its the actuator / Variable veins on the turbo sticking. Mine seems to do it when you gently push the go pedal when your going up an incline. Been in to Mercedes twice now and still say nothing wrong, once under warranty and again with my extended warranty.
 

paul73mt

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Jul 18, 2012
Messages
679
Location
Essex
Car
2010 C350 CDI Sport sold , 2015 E250 CDI AMG Line Sold
Well just an update had a MB tech come out with me and 'felt' the problem waiting to have no4 injector changed so hopefully that was the problem
 

whitenemesis

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Lexus RC300h F-Sport 2019
Did he use STAR and read the codes?
 

paul73mt

Active Member
Joined
Jul 18, 2012
Messages
679
Location
Essex
Car
2010 C350 CDI Sport sold , 2015 E250 CDI AMG Line Sold
Did he use STAR and read the codes?

no codes and the other 3 times it had gone in there were no codes so they didn't do nothing else. This time as the tech felt the problem expected an injector and side that there are 3 engine running tests within star
 

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