clementback
Well-known member
Hello all, I have a 2005 auto BEW jetta wagon and the fuel mileage has dropped considerably in the last year. We have replaced the camshaft, lift pump and I have checked and re-checked the timing, but the fuel mileage (Pen and Paper) has dropped from the mid to low forties to around 31 mpg. The only clue I have is that the engine seems to surge at high rpm, like the engine is missing or the air charge is leaking out, but the hoses are all fine to the air inlet. I have checked the operation of the turbo and it is recieving vacuum and making a full sweep of the vanes. Could a plugged intake cause these problems? Could injector adjustment cause these issues? Weak valve springs? MAF? I have a Vag Com and I do all my own work. We have a friend with an 04' that has experienced the same problem. Any input or personal experiences would be appreciated.