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I have a problem where my 300C is spluttering / pulling back / juddering under hard acceleration. I had the turbo actuator replaced a week ago as had the "lightning bolt" come on and when it was tested the motor had failed in the actuator. I was having problems under hard acceleration before this failed and assumed this was the cause. I have had the actuator off again and re-tested by a turbo specialist and it's confirmed all good (seen it on the bench off the car re-tested fully).

So my question is what could be causing this - there is no lightning bolt, no ECU lights nothing ...... but trying to accelerate on the motorway causes it so pull back like I am hitting a rev limiter. The car revs hard fine in park and if i accelerate slowly (like a sunday driver) it's fine.

Just looking for advice of what to check as someone hopefully has had the same
 

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Yep, get a fault code reader - you will see that the car is overboosting. This is usually caused by the vanes in the turbo sticking due to carbon buildup so you either get low boost and slow acceleration, or if they're stuck open overboost and juddering.

A number of solutions, the one I went for was putting two bottles of Forte turbo cleaner into 3/4 tank of fuel, drive around for about 200 miles as per normal then rag the @rse off it (once warm) for 20 miles or so, doing lots of hard acceleration. Might also be an idea to do the resistor trick on the EGR to help reduce the volume of gunk that gets forced in.

Mine is running so much better since the Forte treatment, pulls quickly without hesitation and no kangarooing on hard acceleration. You may find the actuator failed due to the vanes sticking, it's weird they didn't check that when replacing the actuator...

Oh, one other thing to try - when accelerating hard, don't use the kick down - manually drop it down to 2nd or 3rd to get the revs up and then try - 9 times out of 10 it won't overboost and will accelerate fine, if that's the case it's definitely the turbo vanes...

JD
 
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