A8 Parts Forum - No turning back now

Well its taken myself and Marcin 3 days of running around and bent over that bloody car scratching, scrubbing, poking, prodding and generally cursing.

If it weren't for him helping it would have taken a lot longer.

Now my car has something like half the mileage of Marcin's but Marcin said his had similar levels of build up.

I know his car had lived on the motorway where as mine spends a lot of its time in the town.

We obviously don't know if either cars have been de-coked before or what impact driving styles has on build up but it surprised me how much there was for an engine that has 75k on it and since my ownership has been looked after well with oil changes every 3-4000 miles.

So we began the whole process by removing the manifold which with Marcins prior experience didn't take too long at all because he knew where the hidden screws were at and how to go about getting them off.

Once the Manifold was out I thought it would make sense to have the injectors pulled and dropped off at a ASNU service centre which for me was Clive Atthowe Tuning, these chaps knew their trade well and if anyone is interested in tuning, rolling road, injector testing etc are well worth a visit.

Removing the injectors is quite easy and just required the rails removing and then rotating and pulling up on each injector to remove it.

We dropped them off and carried on with the carbon clean, first out of the inlet tracts is the plates which sit in there. they looked like this :eek2:

They were thrown into a tub with degreaser and left to soak over night after most of the gunk had been scraped off

http://forum.a8parts.co.uk/attachmen...1&d=1477732051 http://forum.a8parts.co.uk/attachmen...9&d=1477731415

All ten were more or less the same and I was surprised at the build up considering how clean my inlet manifold was compared to Marcins if you remember the Flaps inspection video i posted a while back.

Onwards with cleaning we tackled a bank each to speed things up and all 10 tracts and valves were gunked up, some worse than others but all manky.

I didnt take pictures off all of them as there was no point.

Sorry for the massive pics.

The picture of the cleaned tract and valve is after the bulk of the cleaning, now it looks like its still bad but its actually quite small valves in these engines and the specs of carbon are very small, once you get them like that its scotchbrite and degreaser and lots of poking and scrubbing to clean them up a bit more but they really don't get too much better TBH.

Blasting would be the only way to get them spotless.

http://forum.a8parts.co.uk/attachmen...1&d=1477733113 http://forum.a8parts.co.uk/attachmen...1&d=1477733113 http://forum.a8parts.co.uk/attachmen...1&d=1477733473

During cleaning was informed by Clive that 4 of my injectors were below par and need cleaning to try and rejuvenate them as the spray patterns were less then ideal and IIRC 2 of them were leaking when shut so he went ahead and done that.

They recovered three of them by cleaning so I had to order a new injector along with repair kits for reassembly, these injectors have teflon seals that are meant to be replaced prior to refitting.

I decided to order a new oil separator at the same time, hoping to prevent oil mist from getting in the engine (wishful thinking)

Cost of spare parts

Repair kits A06E 998 907G £112.86
INJECTOR A06E 906 036 C £120.14
OIL SEPERATROR A079 103 464 D £118.88
MANIFOLD BOLTS AN 911 262 01 £8.78

ASNU SERVICE

LABOUR FOR SEAL FITTING £33.00
TEST 7 INJECTORS £70.00
TEST & CLEAN 3 INJECTORS £105.00
TOTAL WITH VAT £249.60

The breakdown of the ASNU service is like that because if an injector is good then they only charge £10 each if they require cleaning then its more work.

I asked them to test the new injector also when I went to collect the others to make sure it was OK, I also needed them to fit the teflon seals as special stretching and shrinking tools are needed to do that.

There is a small video in the attachments of some of the injectors on test below.

Once we got them back home it was just a case of assembly, it all went smoothly other than dropping a few things down into engine bay which required rooting around with the borescope inspection camera, and me forgetting to tighten an inaccessible fuel rail pipe.

Once it was all back together this became obvious with petrol ****ing out on application of ignition :mad:

Luckily i managed to get away with removing the T piece with the throttle bodies on, a few other bits of pipework and I chopped up a spanner to allow the tightening of the fuel rail pipe.

I don't think i could have coped with removing the whole manifold to tighten one pipe.

http://forum.a8parts.co.uk/attachmen...1&d=1477735572 http://forum.a8parts.co.uk/attachmen...1&d=1477735572 http://forum.a8parts.co.uk/attachmen...1&d=1477735572

Once it was all back together the second time it was time to fire it up and give it a good blast along to the road to clear it out.

Happy to say its running well, any performance gains I hear you ask, well none that i can feel :hammer: and I did give her a good toeing.

We then took both cars to the local testing ground :rolleyes: and did side by side drag runs and there is no performance difference between both cars so we were quite pleased.

Time for a few :pint::cheers:

Thanks Marcin for all the help greatly appreciated, now you can go back to maintaining your missile :ROFL:

http://forum.a8parts.co.uk/attachmen...1&d=1477736289