twfarms
Active member
I bought this 05 passat Wagon about 2 years ago and enjoy the car but from the day I bought it the fuel economy has been less than thought. The day I got it it got about 32 overall and it has steadily gone down over the 2 years to now 27ish. The previous owner (after I tracked him down since I bought from dealer) was surprised and said he got on the average all the time 36 from this car. 40 - 44 on freeway and 32ish in the city. I have NEVER seen anything over 34 even on a freeway trip for 4 hours each way. The car has always been a little I feel sluggish compared on the foot compared to the bug.
I have had this car into 5 different shops over the 2 years looking for it. They have checked everything from Maf, to fuel pump, to n75, to resistence of pump in tank, to boost leaks, fuel filters, air filters, snow screen and even the throttle position sensor. And the WHOLE time no codes except the n75 which has been replaced twice (once because of code) and another by me because of just trying something.
One mechanic said maybe the injectors are plugging but took it with a grain of salt because all the fuel "tests" came back within spec. (And he was quoting like 700 bucks an injector * 4) So didn't do anything with that idea.
SOOO fast forward to now: Fuel economy is around 26 - 27 after slowly declining over the 2 years.. All tests are normal and within spec. BUT on a cold morning startup after you have started it JUST FINE it sits there and idles just fine BUT you try to accelerate and it's barely moves UNTIL 10 to 20 seconds and then it just "comes back" and motor kicks in and off you go. Try to accelerate to hard to early for to long and it goes into limp mode (probably for lack of boost is my guess) and then restart it and usually works fine by that time and off you go..
OH and the whole time NO CHECK Engine LIghts.. no codes no nothing!! Only thing I can think of is something is telling the computer that the engine isn't ready or something????
I've been researching the Anti shutter valve and not even sure how to check that or even much about it. *SIGH* Would it not send a code if it was restricting airflow??
Any thoughts would be GREATly appreciated and fixing it would i'd be estatic!
Stumped in the Evergreen State..
I have had this car into 5 different shops over the 2 years looking for it. They have checked everything from Maf, to fuel pump, to n75, to resistence of pump in tank, to boost leaks, fuel filters, air filters, snow screen and even the throttle position sensor. And the WHOLE time no codes except the n75 which has been replaced twice (once because of code) and another by me because of just trying something.
One mechanic said maybe the injectors are plugging but took it with a grain of salt because all the fuel "tests" came back within spec. (And he was quoting like 700 bucks an injector * 4) So didn't do anything with that idea.
SOOO fast forward to now: Fuel economy is around 26 - 27 after slowly declining over the 2 years.. All tests are normal and within spec. BUT on a cold morning startup after you have started it JUST FINE it sits there and idles just fine BUT you try to accelerate and it's barely moves UNTIL 10 to 20 seconds and then it just "comes back" and motor kicks in and off you go. Try to accelerate to hard to early for to long and it goes into limp mode (probably for lack of boost is my guess) and then restart it and usually works fine by that time and off you go..
OH and the whole time NO CHECK Engine LIghts.. no codes no nothing!! Only thing I can think of is something is telling the computer that the engine isn't ready or something????
I've been researching the Anti shutter valve and not even sure how to check that or even much about it. *SIGH* Would it not send a code if it was restricting airflow??
Any thoughts would be GREATly appreciated and fixing it would i'd be estatic!
Stumped in the Evergreen State..