Technical No Turbo Boost after approx 2 miles

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Technical No Turbo Boost after approx 2 miles

aerialwaves

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Hi i have a 2007 fiat doblo cargo multijet 1.3 diesel and the issue i have is that after approx 2 miles if i rev the engine over 3000 revs the engine management warning light come on and i cant rev the engine over 3500 revs like there is no turbo boost , took it in to fiat who diagnosed a faulty turbo however turbo specialist say no way is it the turbo so im at a loss really i have read about these diesel parti filter causing this issue but surely fiat would have diagnosed this

Please Help
 
hi thats what fiat said and thats why they diagnosed the turbo could it be the boost switch?
 
I had a similar issue, it turned out to be the turbo wastegate stuck shut, leading to over boost as the gentleman above sugests. Easy to check, look under the car up at the turbo and get someone to rev the engine hard, it should move the wastegate lever. un-seizing it was weeks of plus-gas every evening and tapping the lever with a bar. its not easy to get to!
 
would that happen all off a sudden or over sometime as this started out of the blue
 
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