further 1.8t problems

[gsn1978]

Have you checked the small braided vacuum hose that controls the DV? It's getting more and more common now that these go brittle and crack, and its a b!tch to spot because the braiding hides it!

just nipped out to the car (im at work) and 2 of the brown wires leading to the coils have their copper wire visable...


noone has checked the car since it was bought (with a Vmeter or anything like that for definate or been near the coils), so dunno if that could be it? thanks!...would be great if so!

Mate i honestly think on coil recall all the vw garages used those type of meters to test, what to do is cover the wire in black tape making then wd40 them.... i did and it worked, still get the odd miss but hey, im lookin for a replacement loom.

[topher]

Well I just learned something new myself. I was ignoring the secondary air injection fault because that shouldn't be able to affect the performance of the car. However, it seems that a faulty fuel pump relay can also throw up that error code! Worth checking out.

[AndyMitton]

ill look at that...is it the fuel pump relay or regulator? could this cause the symptons u think? Thanks...ill try the coils too thanks!!

[topher]

Fuel pump relay (J17), and yes if that is shafted, then it could be playing havoc with your fuel pump and giving you the grief you described.

[AndyMitton]

ahhh....wel sometimes it makes the "noise" when u open the door (that's it priming i guess) but doesnt always do this...maybe this is the answer!!??

as for the pressure drop between throttle and turbo...no closer to that?  lol
  or maybe somehow related?
Thanks mate!!

[topher]

minute crack in a hose somewhere possibly, as its intermittent though i'd worry about clearing the other fault up first.. it'll be easier to pick up on the symptoms then.

[ub7rm]

The pressure drop between turbo and throttle body can indicate a problem with the DV OR can be due to the throttle body sooting up.  This happens when you are running rich for some reason, ie faulty MAF / O2 / Temp sensor (the most common ones) or any other fuelling issues that cause you to run rich.  If you've ruled out the DV then clean and readapt the throttle body.  If you haven't sorted out the problem that causes the TB to soot up it will just happen again though - and pretty quickly.

[AndyMitton]

i think the TB sooted up due to me having a faulty temperature gauge, causing rich running of the car.

it feels like a plugs problem with the car idling bad to be honest

should the fuel pump relay (well the fuel pump priming) be heard everytime the driver's door is opened after the car has been stood locked for a while?
Thanks, Andy

[ub7rm]

i THINK I hear mine priming every time I open the door.  Maybe not if I've just nipped into a shop and straight back out but even then I'm sure I can hear it....... I'll keep a closer ear to it for the next couple of days.

[AlanD]

When you open the door is quite a distinctive hummmm noise, you will know if you hear it or not.