sprinter 311cdi restricted rpm

Hi just aquired a 311cdi sprinter but has limited power wont go past 3500rpm
Not very mechanicaly minded can only asume there is a restricter switch some where the van was stood for a year.
any sugestions would be greatly appreciated :)
i am good at tapping things with a hammer Cheers Lee
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Hi lee.
Coupla things to check. Some have an inhibitor switch on the clutch pedal. Not likely but possible. Most probably boost valve on Offside under air box. Best bet is to whip it into MB shop and get it plugged into the magic box. If its been standing there could be a lot of gremlins lurking on DAS!!! Best of luck.
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