Help with cls

[gliggsy]

Hi guys, I'm going to ask the question even though it's been done to death but here goes.
The car's a 2007 Cls320 diesel, it started going into limp about 2 years ago with p2044, generic turbo fail code I believe. I carried on using it because it wasn't too inconvenient to just recycle the ignition until 6 months ago when it got progressively worse to the point of having to have it repaired by MB specialist indy. The turbo actuator was diagnosed and a refurbished one fitted, car was fine and performed perfectly well for a month, took it back to have it diagnosed again and another unit fitted(warranty). This 2nd unit has done exactly the same, a months work and failing already, garage has been informed and have requested to delve deeper. Egr has been out and was spotless, new air filter fitted and exhaust pressure switch fitted. I will be taking it in for repair but was curious if anyone could shed some light on to why it's failing and why it should run perfectly for a month? The problem is worse when the car is cold but won't limp again once re-set..... Baffling

 

[Larkone]

P2044 is coming up as the exhaust pressure sensor. You say you have had it replaced so is the wiring to OK, are there any leaks related to the turbo or its pipe work? On this age I would replace the seals from the turbo to the intercooler as they will have degraded over time. Is there a blockage in the port to the sensor?

 

[Dean Fletcher]

Did the garage preform a software update?

 

[LostKiwi]

Often when a turbo actuator fails after replacement its because the turbo canes themselves are jamming. In that case full replacement of the turbo and actuator is the fix.

 

[gliggsy]

Thanks for the response guys, I don't know about any software updates, don't know much about any other items without further examination, the thing that's got me baffled is the fact that it runs fine once the ignition has been recycled

 

[Wighty]

Thanks for the response guys, I don't know about any software updates, don't know much about any other items without further examination, the thing that's got me baffled is the fact that it runs fine once the ignition has been recycled

You say you used an MB Indy , I take it they are using MB Star diagnostics , what do they think is happening with the car .

 

[gliggsy]

Not 100% sure that it's STAR but the system seems to impart a lot of info ie number of triggers etc, I will ask them next time they have it in, they have indicated that they will need the car overnight to investigate further, the reason for my posting is to gain as much info as I can find

 

[Wighty]

Not 100% sure that it's STAR but the system seems to impart a lot of info ie number of triggers etc, I will ask them next time they have it in, they have indicated that they will need the car overnight to investigate further, the reason for my posting is to gain as much info as I can find

If it’s not Star , then are they a Mercedes Only Specialist ?

 

[gliggsy]

They specialise in MB only and they come recommended, they seem knowledgeable and on the ball, it's MB services near Mansfield Notts

 

[Wighty]

They specialise in MB only and they come recommended, they seem knowledgeable and on the ball, it's MB services near Mansfield Notts

They will have all the kit buddy , good luck

 

[mioba]

Well they have had a few times and still not fixed it, I would be questioning thier competency.

Mercserve Nottingham Radford Road for an alternative, have served me well for 15 years! Roger and Nate there are top blokes!

 

[malcolm E53 AMG]

There has been comment on here lately about replacing the turbo actuator only not solving the problem, I think the general consensus was to replace the turbo and actuator for a reliable result

For a second opinion talk to Jay Manek at Mercland in Nuneaton

 

[gliggsy]

A bit of an update, haven't taken car in as of yet but the problem happens every day and I'm positive that it's the first cycle of the gear up - shift that is causing it to limp. Any thoughts at all??

 

[Uncle Benz]

Any history of the swirl flap motor being replaced? Just a hunch, but I reckon something is just glitching the turbo actuator on that early part of the day. A low supply voltage could do it. The supply line to the turbo actuator is shared with the egr, exhaust back pressure sensor and the swirl flap motor. If the swirl motor has oil in it (common problem) and is sticky when cold it could be dipping the voltage low enough that the turbo actuator is malfunctioning. A resistor mod to the swirl flap plug would prove the point for twenty five pence.

 

[LostKiwi]

When you say 'unit replaced' do you mean actuator or complete turbo?
If it is just actuator then it's entirely possible there is carbon build up on the turbo variable vanes (which is what the actuator operates) which is causing it's operation to be marginal. The first gearshift will cause the actuator to operate as it goes from boost to reduced boost at the change point.
Often if a replacement actuator doesn't cure a problem a refurbished turbo is the cure.

 

[gliggsy]

No swirl flap history but I have got a resistor earmarked on ebay. Not too sure about your hunch though as I can sit and rev car freely once started and everything is fine but as soon as the car has to upshift then it limps

 

[gliggsy]

Hi, only the actuator was changed, and again the limp only happens usually once a day or if the car has been unused for 4 or 5 hrs, then after recycling the ignition the car drives fine and will do for miles with perfect boost and performance

 

[Uncle Benz]

Don’t think the swirl flaps move if you just sit and rev it.

 

[LostKiwi]

Neither swirl flap nor turbo do anything if just revved with no load (as far as I'm aware).

 

[gliggsy]

Oh then I am even more baffled now as the car will reach max revs from cold until moved