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VW Transporter T5 Overboosting turbo which causes engine shutdown

Developed turbo whistle and had turbo pipe replaced whistle developed again so took it to Volkswagen to get pipe replaced on guarantee. They replaced broken clip on pipe and said that turbo was overboosting probably due to leaking exhaust gasket or broken manifold, and that's why pipe and clip had had to give, therefore they suggested strip down to investigate with a probable bill of £2000 and new turbo as manifold and turbo are integral not separate on this model. New clip didn't solve whistle but engine started shutting down when on long motorway journeys, probably as overboosting caused engine to go to safe mode?
Would this be the gasket or manifold as they have said?? This is a 130bhp model that has been chipped to 170bhp, does the 170bhp model have up-rated parts which enable it to handle the extra power and therefore could this be causing the 130bhp model problems? If I continue to drive it with its whistle what damage could this cause? One mechanic has looked at it and said the turbo is fine. And there is no problem with the impeller. The VW garage said they couldn't test the turbo due to the overboosting and another mechanic said I should stop driving it immediately as the impeller would come off and go into the engine (although he never actually saw/ heard the engine). Does it make sense that a suspected leak on one side of the turbo would cause overboosting and therefore blow on the other side of the turbo? This vehicle has done 145,000 miles and was chipped almost from new, but has been well looked after and regularly serviced by VW.
Thank you for your time and any help you can provide.

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Did you try a blow off if its overboasting with the blow off is it easyer for the turbo to blow the overpressure out and it dont whistle's a suggestion

Posted on Sep 18, 2010


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