|
It's almost impossible to diagnose a problem like this remotely with little evidence, but as I know this engine well, I'll make a couple of guesses.
Your fuel consumption is too high. Don't use the trip computer other than for relative values as it is about 10% optimistic.
At the mileage your engine has done, the cambelt should have been changed and it is important that the right tools and method are employed - otherwise running efficiency is compromised. Although the engine is timed from the crankshaft, the relationship between the crank and the cam has to be correct to enable the unit injectors to deliver fuel correctly over the entire range of timing advance demanded by the ECU. The camshaft timing can be checked using VAGCOM or a similar diagnostic package and it can also easily be reset in-situ unless it is a long way out. Slotted fixing holes are provided in the camshaft wheel to allow this.
A further possibility is intermittency in the injector wiring loom. This would also explain the vibration - which should not be there. Again, replacement in-situ is not too difficult or expensive.
The fuel system is reliable on these engines and there is no separate high pressure fuel pump. Take it to a good independent diesel specialist who knows these engines well and who has the diagnostic software. Guessing is expensive.
659.
|
