'98 202 C250 TD - No turbo.

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neilrr

MB Enthusiast
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Jul 20, 2004
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Car
Various.
The turbo on my '98 C250 TD isn't working.

No obvious leaks or funny noises, no lights on the dashboard. The car doesn't have a MAF, it does have a MAP.

Took off the undertray & examined the two soft connecting pipes on the intake system, they seem fine.

Next place to try is the EGR valve.

2 questions:

1) Will I need a new gasket?

2) Can I use isopropyl alcohol to clean the EGR valve?

Actually 3 questions.

If it isn't the EGR, what's the next thing in line to try?

TIA.
 
Get it plugged in firstly. This will save the guessing.
 
A 250TD doesn't have a MAF so can't monitor the EGR valve.

Dropping the turbo will be either the transducer diaphragm is split or the MAP sensor is U/S.
 
DM,

Where is the transducer diaphragm?

Ollie,

It's been on Star but it didn't really shed any light on the cause.
 
Last edited:
On my smart, I lost boost due to the wastegate sticking open.
Usually the cause of that on a smart though is the operating arm coming detached due to the retaining C-clip corroding and falling off. Neither of these faults show on STAR.
 
Bellow said:
On my smart, I lost boost due to the wastegate sticking open. Usually the cause of that on a smart though is the operating arm coming detached due to the retaining C-clip corroding and falling off. Neither of these faults show on STAR.

It does. You just have to know where to look.
 
DM,

Where is the transducer diaphragm?

Ollie,

It's been on Star but it didn't really shed any light on the cause.

The diaphragm is inside the vacuum transducer that feeds vacuum to the turbo actuator.
 
Right.

Thanks.

Where's the vacuum transducer? Is it in this picture?

Ta!

2zsbn7b.jpg
 
Top right. Small matchbox sized item, on firewall between engine and ecus. Pipe runs to front side of plastic manifold.
 

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