Opinions please

[jimmy1888]

Hi all,

Im just on to test your knowledge  I have a 1.8t (AGU) and over the last month or so i have noticed it useing more fuel than usual and the idle is not as smooth as it was, there are not flat spots in the rev range but it just doesnt feel as fast as normal. The car is largly stock though it has a smoothed airbox with pipercross panel filter, a forge diverter valve(which has become very audible recently) and a cat back exhaust.

Any ideas what could be up? MAF? Coilpacks?

cheers

jim

[houston]

very audiable? has a boost pipe or the pipe off the dv come loose?

[dub268]

Are you getting any warning when you start the car like check coolant, just ive got a AGU as well and everything you have said seamed to be happen with mine, poor mpg, flat spots, mine also was cutting out when driving or stalling when sat.

Turns out mine was a fault temp sensor, changed it and im back up 8mpg, no more flat spots and cutting out while driving so im happy 

You can check the maf, disconnect it and if there is no difference then it could be maf, If you can get checked with vag-com

[jimmy1888]

will try the MAF! im i right in saying if you disconnect it and the car seems better it could be that??? or if the car remains ruff its the MAF???

Cheers

jim

[Mr_Orange]

will try the MAF! im i right in saying if you disconnect it and the car seems better it could be that??? or if the car remains ruff its the MAF???

Cheers

jim

If it is a MAF fault, removing it and (giving it a brief run) it will run better.  The ABS light will come on the dash for some obscure reason.  If found faulty try cleaning it first with some electrical contact cleaner.  Other wise trade in the old one at somewhere like ECP for £60 ish.

As said try the coolant temp sender as this would make it run iffy (rich) and drop the MPG.  Only buy genuine from VW and make sure you see which one you need first (green or blue).

[turbomick]

i had smiler probs mate and the trip would not go over 18 mpg i cleaned the throttle body now its ok and trip going to 34mpg round town mate worth a try for nothing mate but clean it by spraying carb cleaner on to a cotton bud and wiping it dont spray carb cleaner direct in to manifold

[jimmy1888]

i had smiler probs mate and the trip would not go over 18 mpg i cleaned the throttle body now its ok and trip going to 34mpg round town mate worth a try for nothing mate but clean it by spraying carb cleaner on to a cotton bud and wiping it dont spray carb cleaner direct in to manifold

do you do this with the throttle body in place or do you need to remove it?

will give this a try in the morning

[turbomick]

remove it mate just make sure u take ya time and dont spray in to it and get all the bits of oil off the butter fly too also take the little 2 wire sensor out after the trottle body and clean this its 1 bolt holding it in this will also be covered in oil. when u done and you put it all back together reconect the battery with the bonnet and drivers door open turn ignision on and u will here the trottle body re-alining wen it stops start the car make sure u do this of it wont idle proppley i messed up first time doin mine and had to get new throttle body 

[Wayne]

Coolant temp sender could also be causing you issues.

[jimmy1888]

remove it mate just make sure u take ya time and dont spray in to it and get all the bits of oil off the butter fly too also take the little 2 wire sensor out after the trottle body and clean this its 1 bolt holding it in this will also be covered in oil. when u done and you put it all back together reconect the battery with the bonnet and drivers door open turn ignision on and u will here the trottle body re-alining wen it stops start the car make sure u do this of it wont idle proppley i messed up first time doin mine and had to get new throttle body 

my engine is an AGU! is it not just the dbw engines that re-aline themselves