Hi Paul,
Was there a reason the injector seals were replaced or just regular maintenance work?

(I am not a diesel mechanic the following is my attempt at basic problem solving)
If the change occurred immediately after the service then this suggests something touched during the service.
Typically look at air flow through the engine, (Tick, Air filter done), obvious exhaust emission change/increase, leakage (recheck the work done), Fuel metering.
Could it be a injector now gone faulty?

Random... the following relates to a petrol engine vehicle I bought many years ago, not a high mileage vehicle and seemingly well maintained, but it always got less than the expected fuel economy by a long way. Then one day the muffler let go and suddenly other than the noise the fuel economy improved dramatically. A replacement muffler resolved both the noise and fuel economy... but this event is something I would expect built up gradually over time.

 

Hi Paul,
Was there a reason the injector seals were replaced or just regular maintenance work?

(I am not a diesel mechanic the following is my attempt at basic problem solving)
If the change occurred immediately after the service then this suggests something touched during the service.
Typically look at air flow through the engine, (Tick, Air filter done), obvious exhaust emission change/increase, leakage (recheck the work done), Fuel metering.
Could it be a injector now gone faulty?

Random... the following relates to a petrol engine vehicle I bought many years ago, not a high mileage vehicle and seemingly well maintained, but it always got less than the expected fuel economy by a long way. Then one day the muffler let go and suddenly other than the noise the fuel economy improved dramatically. A replacement muffler resolved both the noise and fuel economy... but this event is something I would expect built up gradually over time.

Grant... I had noticeable exhaust leaking when the car was idling - could smell it more than normal, plus black splatterings on the driver side front inside wheel arch (I found this on this on the forum as a symptom to look for for injector seals... went and checked and there was the black splatterings). VW then confirmed that this was a result of injector leaking/seals. And yes, the decline was noticed immediately after the injector seals were done - so I am very confident it was a result of that work.

 

Hi Paul,
Kinda surprised, how did they work out that the seals have perished and went ahead to change them?
Was there a leak, misfire?
After 14yrs of owning the V10 I replaced two injectors and put on all the 5 seals that go on each.
The old seals hadn't perished but had carbon on them it made sense as I was replacing the two misfiring injectors with slightly used ones I got from Germany.
Vcds shows the deviation when an injector is 'misbehaving'
So wondering why the seals were changed? Have you run a scan to check deviation, before and after?
Now re the fuel economy change, I too noticed the increase in consumption straight after, not as much as yours but about half to a litre more to 100 on the same route, distance I regularly do.
I ran seafoam for the next two tanks and as I drive more now the economy seems to returning to normal- what I had before.
Seems like there's something to it for sure, when injectors are replaced the consumption does go up, atleast for a while.
Of course the injectors in 7p are different to 7l...

 

Hi Paul,
Kinda surprised, how did they work out that the seals have perished and went ahead to change them?
Was there a leak, misfire?
After 14yrs of owning the V10 I replaced two injectors and put on all the 5 seals that go on each.
The old seals hadn't perished but had carbon on them it made sense as I was replacing the two misfiring injectors with slightly used ones I got from Germany.
Vcds shows the deviation when an injector is 'misbehaving'
So wondering why the seals were changed? Have you run a scan to check deviation, before and after?
Now re the fuel economy change, I too noticed the increase in consumption straight after, not as much as yours but about half to a litre more to 100 on the same route, distance I regularly do.
I ran seafoam for the next two tanks and as I drive more now the economy seems to returning to normal- what U had before.
Seems like there's something to it for sure, when injectors are replaced the consumption does go up, at least for a while.
Of course the injectors in 7p are different to 7l...

Singh... as mentioned to Grant above, "I had noticeable exhaust leaking when the car was idling - could smell it more than normal, plus black splatterings on the driver side front inside wheel arch (I found this on the forum as a symptom to look for for injector seals... went and checked and there was the black splatterings)". What is "seafoam" - I will give it a go. VW have said they have done all the checks with the injector performance/operation and it is all as it should be (although I have very little faith... the fault finding and real problem solving is lacking).

 

As said, check injector deviation. Did they replace the hold down bolts?

 

I don't know on the hold down bolts - will need to check.

 

And since the injectors seals were replaced, we have now had the "glow plug" error icon come up 3 times. Every time has been on a trip towing the camper trailer (1.5 tonne), typically after 2 hours plus continuous highway driving. The car goes into limp mode... we switch it off and then restart and all is good again? VW tell me I need to do the exhaust regeneration which I did a couple of times - I do not believe that is the problem (this was last week... error code came up around the 2 hour drive point).

 

What's your ash loading?
To give you an idea original seal kit for 10 injectors cost me $160 and $76 for the bolts and three hours of my time to replace. I had never done anything like it before so next time it will be half the time.
Let us know your deviation values and what they find

 

Sounds like you're heading in the right direction Paul. If this guy resolves it and you're happy with his service, don't forget to share the details.

 

Good to see you've found someone who actually knows what they are doing. I purchased my treg with a full vw service history, the previous owner had been complaining of noise on previous services, which the stealer couldn't seem to figure out. The injector seals were completely stuffed.

If you need to borrow a vagcom at any point let me know, I'm on the Goldy as well.

 

Beg to differ, as far as I know there is no taper on the seals. I have closely examined both, seals for 7p and 7l injectors.
And there is no reference to taper in the removal and installation procedure either.

All injectors must go back into the same cylinder they were pulled from. Injector values are adapted into the ecu- not the case for 7l.

There would be build up in the air intake but that can't cause sudden increase in consumption post the work carried out.
But would be good to get it cleaned up anyway.

Besides the deviation scan was injector return flow rate checked? If there are no leaks outside then it could be an open injector or seal issue
The O rings have to be guided on very carefully onto the injector-must not be rolled.
Good luck.

 

There is 100% a taper on the seals. It even has a diagram on the bag telling you which way to install them, so if OPs problem ends up being related to that, he should be pretty irate.

Also, the O rings can be rolled onto the injector for common rail cars, all it does is stop combustion gas coming up the injector if the seal leaks, it doesn't seal diesel like your V10.

 

 

Thanks Brendanm, that clarifies. There's a taper for 7P but not for 7L. The copper seal is a new design for common rail and the injector type.
If Pauls issue is related to inverted copper seal then its on the dealer.

heres the injector O ring kit for 7L, no taper. and the injectors pulled out have the same flat copper seal.

 

^^Bad foot. Bad bad bad. Leave that pedal alone. (lol) /jk

 

I have done injectors, seals and new bolts on my 17 wolfsburg. After checking the deviation and a leak test which confirmed my misfire on idle.

 

Hi Gralis, 2017 model and you've changed injectors already? did you replace with new or get them refurbished?

 

Did the seals on one bank about 10,000km ago and am experiencing a similar reduction in economy (7L). New seals and bolts used, but have noticed an intermittent louder 'diesel rattle' under load since the work was done - maybe a misbehaving injector?
Will watch this thread with interest.

 

You can't refurbish them.

 

Got two of mine done(7L) here in Sydney, cost is higher to do 7p injectors though.
Try Westend, Bosch diesel or any other

 

Injectors in Melbourne $435 each for 7p6 180kw.

 

from your first picture, if you scroll through the menu when the engine is idling you'll get idle/current consumption. Should be around 1 or so with no pressure on the pedal ofcourse.
if its closer to 1.5 then you definitely have a problem, if its .9 then couldnt get better......

 

from your first picture, if you scroll through the menu when the engine is idling you'll get idle/current consumption. Should be around 1 or so with no pressure on the pedal of course.
if its closer to 1.5 then you definitely have a problem, if its .9 then couldnt get better......

Mine is around 1.5-1.6 l/100km, kept flicking between both.

 

What ended up happening with this?

 

I will let OP respond, problem was solved certainly 🙂

 

Has anyone bothered to recut the injector seats? Sounds like seals are just being put in there, without making sure the sealing surface in the head is actually flat. When the seals go, they can etch a track across the head, just replacing the seals won't fix this.

It's still very interesting that your economy suddenly dropped when vw first did it. Thanks for the update 👍

 

Has anyone bothered to recut the injector seats? Sounds like seals are just being put in there, without making sure the sealing surface in the head is actually flat. When the seals go, they can etch a track across the head, just replacing the seals won't fix this.

It's still very interesting that your economy suddenly dropped when vw first did it. Thanks for the update 👍

That was my thought too Brendan... obviously the seating surface for the seal washer is damaged/scratched in some way. Twice the injector seals are done and it's not picked up?

 

I can highly recommend Le Mans Auto at Woolloongabba. They were great with my last service a month ago. Contact Aaron and let him know Leon sent you to them. Aaron is very knowledgeable. (07) 3726 9544

 

I can highly recommend Le Mans Auto at Woolloongabba.

Interesting ... they have 5 locations and one of them (Newstead) is a hell of a lot closer to me than my current guy out in Northgate (German Autos).

What did you like that makes you recommend them ?

 

Heard that Taringa dealership has been hopeless and as a result shutting down..

 

Really! That's interesting. I drive past there everyday and they always have a heap of cars there for services. Oh well, I guess you can't dodge poor quality and in the end, it catches up with you.

 

We'll have to organise a meet and greet mate. I live just west of indooroopilly but work at Milton.

 

Just replaced injector seal on #2 cylinder that had blown very recently. VW stealership charged me $48 for copper seal, bolt and O ring X 2. Have ordered new set seals and plan to replace other 5 cyl. Was getting a -1.55mg/stroke reading on vcds on that cylinder afterwards but has settled back down to -0.4mg/stroke after several trips.
My current fuel economy is 1.1ltr on idle in neutral and jumps to 1.4ltr when put in drive. Anyone know if that is normal?

 

Another 100% recommendation for Aaron @ Lemans Woolloongabba.

I came across this post and decided to give Aaron a go after having so many issues with my Touareg that current mechanic can’t seem to fix. Aaron pretty much had the answer on the phone - got me booked in and had me diagnosed and fixed within a day! An issue I’ve had for 2 years- multiple brisbane dealers and so called “specialists” - ‘no fault found, cannot fault, cannot fix, nothing wrong’ this guy had me in, diagnosed, fixed and out within a day!!

I found my new mechanic. Couldn’t believe it

 

Good to hear mate. I dealt with Aaron a few months ago on a turbo rod actuator issue and he was trying to find a solution. In the end they created a part to solve my issue which then allowed proper regulated boosting. He certainly knows his stuff. I've directed a couple of people to him now and they've been impressed with him as well. He's a top bloke too.

 

Glad to hear it got fixed mate.

 

Wow! Sounds exactly what's happening with mine. One would not think injector seals would lead to this. The opposite moreso. Had a well known euro specific workshop do this work on my touareg. It did however get a tune and the dpf/EGR deletes. Bu fuel economy went from 8ish to nearly double that!! What should be the fuel deviation values?

 

I had a similar experience replacing the seals on one of the two banks of the v10, the reported consumption in the mfi went up.
The difference was about 10% or so, didn't measure actual consumption/difference... One would think it should improve, but why it degrades remains a mystery