Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
It is usually a stuck EGR valve on this engine. This causes all of the turbo boost to be dumped off into the exhaust, this is probably the whistling your hearing,
EGR stands for Exhaust Gas Recirculation. The only other things that can cause this is the inlet port shut off flaps built inside of the intake manifold. They also stick causing the turbo boost to be blocked and allow very little airflow into the engine.
Usually a fault code scan will help determine which one it is.
That would be great. I do have a check engine light
Yes, this should tell you which problem is actually causing the problem.
i guess I need to get it hooked up. It has 92000 miles on it. Does that change your theory?
I was really scared I would be replacing the whole thing.
No, usually these problems happen because of the carbon build up inside the intake at the highe mileages.