Om648 whooshing sound when rev in idle.

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350cls

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E55k AMG Sold / S211 E320 CDI I6 W212 E63 6.2 N/A saloon.
I've read up about this on other engines but not related to the 648.

So when I rev the car at idle I get this whooshing like matalic sound when the rpm is returning if that makes sense.

When I press the accelerator you can slightly hear the whooshing sound but it's when the revs drop you get an after sound like a worn type bearing noise.

No EML, car is running and idling really well. Apart from this noise. It definitely wasn't there before. I've had the turbo actuator refurbished and it wasn't there when I had that installed few weeks ago. This noise is definitely new to me.

Any advice to what it could be?

Thanks Tom
 
Worn bearing somewhere on the belt wheels perhaps? Depends exactly where you think it is coming from.
 
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Video uploaded. Thanks
 
I have a feeling it's the turbo. I took the car out for a little spin a while ago. The noise the car is producing under acceleration
Is very very loud. Like a whining alternator noise. Could this confirm the reconditioned turbo actuator has failed already. Also noticed the car was no way giving full power when in motion. But no EML lights on. Doesn't sound good at all 🤔. Is this the noise referred to as the SIREN noise?

The video above was when the car was well up to temp. When I took the car out a while ago it was fairly cold.

It's as though the noise is worse when the engine/turbo is cold?
 
Was your old actuator rebuilt or they gave you exchange? They must be calibrated to the particular turbo. If it’s incorrectly calibrated it can perform badly and turbo can be noisy. It could also be a defective turbo though. Hard to say from video
 
I can't say for sure because it was with the Indy I use. The guys that supplies the reconditioned units had a fire at he's unit. Which delayed the repair. I will have to clarify this with the Indy. He's on holidays at present. The guy that works for him is at the workshop. I'm not sure if he would know this or not. May have to wait until the guy I deal with is back.

I also noticed when the reconditioned unit went on the car, the car did smoke much more than it did previously . I do drive this vehicle much more now. So maybe I didn't notice it as much before.

Should also add, this noise is very very loud. Embarrassing loud.

If it was the old unit rebuilt, would it not need calibrating. It's only if it's a exchange unit.
 
This noise I imagine is way louder than a boost leak.

So if I remove the airbox and metal frame it sits in, this will then expose the turbo, and MAf down pipes. Is there any thing a novice like myself can look for to see if anythings a mis in this area?

Take the turbo off to visually inspect?

Any pointers guys?

Cheers
 
If you can take the intake piece off the turbo and get your fingers in there, check for float on the centre shaft. I had a Vito the other day that had a chip out of the exhaust side impellor. You could do a very accurate impersonation of a police car siren just by modulating the throttle pedal
 
If you can take the intake piece off the turbo and get your fingers in there, check for float on the centre shaft. I had a Vito the other day that had a chip out of the exhaust side impellor. You could do a very accurate impersonation of a police car siren just by modulating the throttle pedal


Thank you Jbw,

I'll give that a go after work tomorrow, if I get the light of day, if not it will be Sunday.

If I feel float/movement, I take it, it's faulty? Hard to determine, as I don't know what I'm looking for lol. I'll give it a go.

If I do get the intake off the turbo, is it ok to start and rev the car, or best not to?
 
A small amount of play is acceptable. If it’s waggling around it’s not. You can run it open, but you’ll get a maf code before long, but it might show where the noise is coming from.
 
So the problem becomes worse it seems. On starting the car this afternoon after finishing work. A lot of white smoke on start up, when I revved the engine it produced lots and lots of white smoke. With the noise apparent in the video I provided.

Turned engine off, got airbox and metal heat shield off. Took the intake off the turbo. The movement from the propeller is very noticeable. I would say 10 to 15 mm in play circumference wise. This couldn't be right. No visible leaks in and around turbo. As said the Shaft that sticks out from the propeller couldn't be right to have that much movement.

Don't know where to go with this now. This white smoke is worrying.

Coolant up to level, oil cap no residue. Small but off blow back from oil filler cap. Nothing much though.

Do have a code which is related to glow plug injector 6.

Starts perfectly and idles perfectly. Once warm the smoking is much less. But when revved big clouds white smoke😟
 
I have a feeling it's the turbo. I took the car out for a little spin a while ago. The noise the car is producing under acceleration
Is very very loud. Like a whining alternator noise. Could this confirm the reconditioned turbo actuator has failed already. Also noticed the car was no way giving full power when in motion. But no EML lights on. Doesn't sound good at all 🤔. Is this the noise referred to as the SIREN noise?

The video above was when the car was well up to temp. When I took the car out a while ago it was fairly cold.

It's as though the noise is worse when the engine/turbo is cold?
It is related to power output. Since its a guessing game at this point, check the inlet port motor/servo motor.
 
The movement from the propeller is very noticeable. I would say 10 to 15 mm in play circumference wise.
That's about half an inch. It's fooked...
Don't know where to go with this now.
Back to whoever rebuilt the turbo, 'cos it's fooked...
 
Turbo is 💥

Had the actuator reconditioned not the turbo. It's the original turbo.

Reconditioned/secondhand turbo it looks like then.
 
Can anyone recommend a company for purchasing a reconditioned turbo for the 2004 e320 CDI lL6.

Thanks.

Forced induction what a
Pain in the ....... The beast will need to come out of the garage, was all wrapped up for the winter, the neighbours won't be happy 🤭 them cold starts are brutal 🙈
 
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So been looking at these reconditioned turbos and have found a company that seem to be well in the know. Has anyone got any history of using the company with the link I have attached.

Thanks.

 
So been looking at these reconditioned turbos and have found a company that seem to be well in the know. Has anyone got any history of using the company with the link I have attached.

Thanks.

Nope. Don’t like that at all.
 
Nope. Don’t like that at all.

Could you elaborate?
 

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