vwpassatt Posted January 11, 2007 Report Share Posted January 11, 2007 The fuel consumption has gone up, now 35mpg 8ltrs/ 100Km was over 50mpg! no leak, no error lights, changed the Mass sensor seems worse? don't trust local dealer HELP! Link to comment Share on other sites More sharing options...
pritesh Posted January 11, 2007 Report Share Posted January 11, 2007 When was the last time you gave it a full service? have you checked the tyre pressures? Link to comment Share on other sites More sharing options...
vwpassatt Posted January 11, 2007 Author Report Share Posted January 11, 2007 service + cam belt August tyres OK, I think it's something in fuel / sensors / timing Link to comment Share on other sites More sharing options...
meriafel Posted January 13, 2007 Report Share Posted January 13, 2007 Have the 52plate Sport version. Before Christmas had all symptoms of a failing air mass meter, totally flat above 2500 rpm. No power at all with foot to floor in any gear. Swich engine off, all back to normal! Tried new fuel, was on ESSO (normally BP Ultimate) but problem recurred again. Ordered new Air mass and MAP which I collected from the Midlands at New Year but remains unfitted as the problem hasn't shown itself since! I suspect picking up water in fuel as fuel was low on the occasions it happened. (Our nearest BP is 15 miles away so I get a Gallon or two locally until I'm near the BP Garage). Had another 'gremlin' last autumn that hasn't recurred. Had dash display flash up brake pads on two occasions when not even braking. Pads and discs all changed last summer so knew all was well. Again no signs since! Hope you get sorted as easily. Link to comment Share on other sites More sharing options...
ChrisBradburn Posted January 14, 2007 Report Share Posted January 14, 2007 [ QUOTE ] The fuel consumption has gone up, now 35mpg 8ltrs/ 100Km was over 50mpg! no leak, no error lights, changed the Mass sensor seems worse? don't trust local dealer HELP! [/ QUOTE ] My 03 Passat Estate has exactly the same problem. Happened one day last December. Fuel consumption just dropped from the usual 45mpg to 40mpg. Same weather, same tyres - pressures OK. Had a look at the air filter which isn't too bad but the cold air box was full of leaves. Hoovered it out but no real difference. Fault only seems to be on acceleration.. If I drive really gently, can get up to 44mpg but suspect that that should be around 50. It is due for a service in the near future (600 miles). My suspicion is that this is pre-programmed such that you feel you have to get it serviced as something is going wrong with the the car. Other people's experiences would seem to contradict this. We'll find out in 600 miles. Could it be something as simple as a dirty air filter? Link to comment Share on other sites More sharing options...
vwpassatt Posted January 15, 2007 Author Report Share Posted January 15, 2007 just put a new air filter still 30'ish MPH, speed etc is still OK acceration any ideas? Link to comment Share on other sites More sharing options...
gypsyboy Posted January 15, 2007 Report Share Posted January 15, 2007 cold air box was full of leaves. where is this? Link to comment Share on other sites More sharing options...
ChrisBradburn Posted January 15, 2007 Report Share Posted January 15, 2007 [ QUOTE ] cold air box was full of leaves. where is this? [/ QUOTE ] Underneath the air filter. The inlet air pipe goes between this and the air intake located just behind the front grille. If I could work out how to include pictures I would show you but they seem to end up as attachments when I do it and it kind of loses its impact! I was talking to the local garage guy this morning and he recons you have to chisel out the debris on some cars. It's because the filter is simply replaced during a service with scant regard for anything else. They are difficult to get at on a Passat so it's no wonder they get little attention. Chris Link to comment Share on other sites More sharing options...
ChrisBradburn Posted January 16, 2007 Report Share Posted January 16, 2007 I just had a run up to Liverpool at the weekend. The engine suddenly felt a bit more perky around Stoke on the way up and is now back to 50mpg on motorway cruise (measured on the way back) and 43 on the old commute. So what's caused that? It's not as if it gets molly coddled the rest of the time! Link to comment Share on other sites More sharing options...
vwpassatt Posted January 16, 2007 Author Report Share Posted January 16, 2007 I did change the air filter yesterday, it looked too dirty if the dealer had changed it september and lots of straw underneeth? vac'd out and blow the rest but still not showing much above 30mpg takes all day to 40mpg. I have fill up for a 100 mile test and the max range is now 550 was 630 on a tank full. but still goes like a rocket!! thank god. Link to comment Share on other sites More sharing options...
vwpassatt Posted January 28, 2007 Author Report Share Posted January 28, 2007 still no real answer, but I put a lot of addative to clean the jets and instant improvment cheap supermarket fuel now i will fill 2 tanks of ESSO + addative then 2 tanks of the best BP + addative I think this could solve it. Local dealer wants over 2000 NO garentee the bastards, i think they did it. Link to comment Share on other sites More sharing options...
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