unlikely that there is anything wrong with your turbo,follow Sixtos advise and change to a pressure operated wastegate control.On the passenger side of you engine compartment there are several troublesome components that you can eliminate and save yourself a bunch of future headaches.That system is just not worth the aggravation it causes.

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Red Green "This is only temporary,Unless it works!"

97 E300D 157000 miles
87 300TD ?141k? miles