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If your TDI is a PD type then you're better off erring on the short/fast side. There were many cases of prematurely worn out cams on PDs due to oil. This means sticking to the oil norm and change interval specified by VW. If the engine is a non-PD TDI (such as ALH, AFN etc.) then you could try using oil analyzer (such as lubricheck) in order to determine ...


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You can rev it up and see if the vane boosts it to 100% at any moment. If not, it's a ECU not allowing to reach the pressure. So the issue is somewhere before your turbo, like detonation, pre-ignition... If it doesn't open a boost fully, you should see your Lambda sensor readings. Do you have knock sensors? Is the smoke white or black? If the smoke ...


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Some thoughts on how to verify if you have... an intake obstruction Disconnect the air filter (keep the MAF in place) to expose the compressor inlet and log boost values with the car at idle and under load. If the boost numbers are close to what the engine computer is expecting then this would confirm that something upstream the MAF is obstructing the ...


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You might find this post about Dynamic EGR Control for TDIs on the TDI Club forums by Mark at Malone Tuning interesting. Mark reports on his experiments with the EGR system on a 2006 TDI. He reports that the stock EGR settings resulted in a faster warm up (less wear on the engine) and better fuel economy than he got with the EGR deleted or dialed back. The ...


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For what it might be worth, we have a pair of Jetta Mk4 TDIs one with the ALH engine, the other with a BEW. Both are well over 200,000 miles (the ALH is pushing 300,000) and for the most part we do our own maintenance, using a local shop for thorny diagnostic issues and when specialized tools or a lift are required. Over about 200,000 miles the ALH has run ...



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