Question about 2003 Volkswagen Jetta TDI

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03 gli there is lag between 2500 and 3200 rpm then seems fine at lower and higher rpms =6 spd

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First check for a vacuum leak under the hood.

Inspect ALL of the connections of small vacuum lines as they connect to nipples on parts.

Make sure the vacuum reservoir. A black boxy thing near the firewall does not have a hole in it and that the one way valve connected to it is functioning well.

Posted on Jul 29, 2009

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Following on from previous answer, nearly all modern diesels have a wastegate, a device that allows exhaust gas to by-pass the turbo at high speeds and loads. Failure of this to open (controlled by vacuum as last answer), could give symptoms as described. The wastegate is part of the turbo assembly so follow exhaust manifold (rear of engine) and locate small rubber pipe to wastegate and follow it up to the wastegate control valve. Pull pipe off between wastegate and control valve and **** on it - you should be able to feel resistance - if you can keep sucking air, the wastegate diaphragm has failed, if not could be control valve or lack of vacuum - do brakes work OK? Funny question, but all on same circuit. If they do, then likely not a vacuum problem, more likely control valve or ECU or sensor problem.

Posted on Jul 29, 2009

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