further 1.8t problems

[AndyMitton]

where do i start? i am seriously fed up with this car. worst i have ever owned. got VAGCOM on this weekend again, and only fault codes were the pressure drop (check DV) one, and sexondary air injection system leak or something? ill post that up inabit.

checked all the hoses...nothing leaking. spent a while doing it. cleaned TB, used VAGCOM for adaption...

i loked at the missfire counter:  occasionaly, when i revved it high, and then let the revs drop, there was a missfire on cylinder 3...on about 15 runs, i got a total of 3..there were none previous to this. maybe my plugs are a bit crap. didnt have time to look tbh

running bank 115 showed the turbo bossting at around 1040mb where 960 was being requeted for...this seemed to be hiigher than the requested on revving

MAF...the readings on idle seemed to be ok, about 2.8 to 3.0...only seemed to reach 80-85 on a full rev up. probablt due to it being revved in neutral, not using much load

logged block 032...both values were zero...now im led to believe from a few forums this represents the front o2 sensor being broken? is this correct...and could this be the casue of all this crap?
 
still getting poor mpg, bad idling (felt like was running on 2 cylinders this morning) and shoddy performance...

got the above errors and bank 032 both reading zero? any ideas people before i burn this dam car.lol

Thanks, Andy

[topher]

Did you read block 032 before or after you cleared the fault codes? clearing fault codes resets both 032 % values to zero. Did you check this guide by the way? http://www.ross-tech.com/vag-com/cars/fuel-trim.html

What symptoms does your car have?

[AndyMitton]

read them after i reset the DTC's that would explain


its getting poor economy...performance is reallly hit and miss, judders like nothing on earth some mornings...the revs are almost pulsating; feels like a bad missfire...this stops after a few minutes of driving, and the idling is always lumpy, although idle speed is within limit

Thanks, Andy

[topher]

ok, and what have you tried/changed so far? (Sorry im playing catchup here, dont get to read the forum much these days!)

[AndyMitton]

no worries....thanks

i had a bad temp sensor and changed that...that was casuing a fuel trim error code (rich running)

17545 - Fuel Trim: Bank 1 (Add): System too Rich

        P1137 - 35-10 - - - Intermittent

which has now gone...i cleaned the MAF with that isopropyl whatnot...cleaned the throttle body and re-aligned with VAGCOM...changed the diverter valve (which a standard bosch one...which is stil in working order)



checked hoses and they seem to fine...maybe ive missed something though. just frustrating the hell out of me...every so often the emissions light pops on (and stays on until reset)

the two DTCs i get are

2 Faults Found:

16795 - Secondary Air Injection System: Incorrect Flow Detected

        P0411 - 35-00 - -

17705 - Pressure Drop between Turbo and Throttle Valve (check D.V.!)

        P1297 - 35-10 - - - Intermittent



thanks!

[topher]

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!

[gsn1978]

I had/have the same thing with my 1.8t, i changed the same, also changing the DV for a forge one, however i took the cover off the top of my engine to find the coil pack wiring going to the plug had little slices in them from (at some point) someone checking them with one of those volt meters that cut in to the cable, i taped them up and am looking to find out where the coil loom joins, have a look close at the wires, my miss cleared after a couple of mins as well, (more than likly the insolation exspanding with the heat and sealing..)

just somethin to check for....

[AndyMitton]

i have...i think its been replaced...its not braided the one on mine...(the on on top of the DV?)

its just a rubbed pipe that connects to a much stiffer rubber pipe...this SEEMS to be in order. may be worth changing..what size is it?  or is there a part number pls?

saying that, the diverted valve does sound loud sometimes and un noticeable others...(a woosh not chattering)...

Thanks

[AndyMitton]

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!

[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!

I was advise about this when changing my dv too, and yes its a twit!!