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2005 Volkswagen transporter van 2.5l TDI auto.?

lack of power, it starts ok every time however vehicle is very lazy on takeoff as well as normal driving, there are no fault codes at all, turbo ok, intake/exhaust system checked for leaks ok, fuel delivery up to specs. unit injector and back pressure after injectors up to specs, swapped air flow meter with a good unit made no difference, there are no excessive smoke at the tail pipe, we checked the compression well within the upper limits of the specified ideal operation pressure can't figure out what is wrong with this vehicle can any body help with that??? (we suspect that this problem developed after replacement of short block, we can't be sure about the way this vehicle drove before as it came in on a tow truck) any comment's or ideas to guide us to the right path will be welcome Thanks.... timing is ok as there are special tools to time up the engine and they fit just fine at the designated position of cam and crank shafts.

Public Comments

1. Throttle linkage? Perhaps is not opening all the way like it should. Maybe a floor mat that is not allowing to push the throttle all the way? Also, clogged intake like the filter or some foreigner got in the air box, like some critter that is nesting. Does it has a governor? Maybe is faulty and setting the engine at a lower speed. Seems that all mechanical parts checked out according to your post. I guess in order to troubleshoot it is, to back to the basic Automotive Knowledge. We all know needs Air and Fuel to make it work. Diesels needs fuel at the precise moments to ignite. So what would cause a low performance? Lack of air, no enough fuel, bad timing, linkage problem or a bad computer that is not setting the engine right (that could be a bad speed sensor that is giving wrong info to the computer).