bodrumlu

Hi,

i am from Turkey and own an S Coupe m278 engine. I think it has the highest miles on the world with first engine and turbo and gearbox. It has 330.000 miles (530000 km) and still drives like a dream. I have now the following problem. When i start the car it runs fine and boost pressure is ok. But after 3 to 5 minutes it looses all the boost pressure. When i restart the car boost pressure again there for 3 to 5 mintutes. It has fault code p0299. Alteade changed the solenoid for wastegate.
i have a little rattle at the turbos but i dont understand why it only has boost for a few minutes.
Any help is appreciated.

ibbij

Congratulations on getting such high mileage on your M278 engine! If you don't mind me asking was there any special maintenance or way you cared for the engine that has kept it running smoothly for so long?


(Note: This will probably be moved to the W217 forum and out of the W222 forum by one of the administrators.)

bodrumlu

The car has had its regular isnpections at the dealer and the miles are almost only driven on highway. I would say 95% highway miles. No special maintanance. 22 inspection till now 😁
But the car drives still like 50.000 miles.

MBNUT1

What year?

bodrumlu

Year is 2017

VII

That is turbo underperformance check for boost leaks and check turbo for play and wear.
At that millage it would not be surprising if you need a new turbo.

Donnymac

Congratulations! Car is a brute wrapped in class that loves to run.

And, you proved it!

MBNUT1

That year has the cast iron liners which I suspect have contributed to it's longevity.

BenzFan2001

I would put money on it being the wastegate actuators, I had a c300 that was doing the same thing. A restart would fix it for a few minutes.

MBNUT1

Are the actuators different from the solenoids that he has replaced?

bodrumlu

I think its the wastegate flaps in the turbo. Does the engine have to get out to change these?

MBNUT1

Prettiest car with 330,000 miles on it in the world