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Thread: (TSI) Another carbon build up removal DIY

  1. #11
    Senior Member
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    2008 Jetta TFSI
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    I have this planned for this weekend the decarbon that is, I have 113k on my TFSI and a failing #2 injector so all will be replaced going the Subaru cleaner route as the walnut blasting requires a high capacity air compressor. I will take some pictures of the ports and inlet valves, I expect them to be very heaverly carboned also exacerbated by a failed PCV at 85k.

    The US cars have worse build up on theirs because there oil is ummm shit to comply with their pollution laws some of the good additives are non compiant plus their winters are harsh which impacts the oil with contaminates / condensants.
    2008 FSI Jetta 2.0T Tune by DriverMotorsport S2

  2. #12
    Senior Member barney91's Avatar
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    Injector may just be clogged. One thing people don't give attention to when carbon cleaning is the state of them.

    Resting them in Subaru cleaner dissipates the mess.

    This is just 60kms on a TFSI. Yours at higher milage will likely be worse.





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    Last edited by barney91; 09-03-2014 at 09:38 AM.

  3. #13
    Senior Member El_gti91's Avatar
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    Great work Barney!

    I need to do this. Even though I've had the intake clean performed from the outside by BLA I'd like to go in further.

    Well done again.

  4. #14
    Senior Member barney91's Avatar
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    Cheers.

    Intake clean method may loosen some bigger chunks but I don't see it flushing the system and certainly won't aid injector cleaning as its DI.

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  5. #15
    Senior Member Lazarus7's Avatar
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    My engine was pulled apart last week, 60,000km and pretty much zero carbon buildup. Have been running wmi intermittently since about 45,000km.
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  6. #16
    Senior Member barney91's Avatar
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    Dang. Gotta get w/m now!

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  7. #17
    Senior Member barney91's Avatar
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    Pic of cleaned injectors added ^^

  8. #18
    Senior Member
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    I hope it is ok Alex to add a few hints and tips for this task for anyone planning on DIY.

    I undertook this task as part of replacing a failed fuel injector on the weekend, first allow plenty of time for the cleaning process especially if your vehicle has a few k's.

    Hint make sure you have all the correct tools, it is imperative to have the M10 triple square and it needs to at least 4" long because you need to get between the coolant line and the oil line to the oil cooler, also I spent a fair bit of time trying to locate the M10 TS bolt, it is below the throtle body and can just be seen by following the line of the inlet manifold support arm which is aluminum and 12 mm wide.

    Hint if your budget runs to having the electrical sensor disconnect tool get one, it is a very painful task to get the G247 fuel pressure sensor plug off as it sits under the inlet manifold and there is very little room, it would pay to have someone with very small hands remove this

    Hint the lower 10mm nut holding the inlet manifold on the passenger side requires a 1/4" drive 10 mm socket nothing larger will fit between the inlet runners.

    Hint the inlet manifold is held on very tightly by the blue seals on the injectors that enter the fuel rail so expect to use a reasonable amount of force, I spent a good hour wrestling with it because I triple checked I had removed ll the bolts My car had over 112,000 kilometres and the large crankcase to valve cover PCV line was very brittle from heat fatigue so you can guess that it was likely to be damaged when I removed the inlet manifold and it was I repaired it using the standard backyard mechanics technique, replaced the damaged section with a bit of washing machine drain hose and gaffer tap, admittedly it is only temporary as I need to decide to use the OEM part or just go the PCV blockoff route.

    I spent a good day and half cleaning the carbon from the values and inlet ports, I soaked the area with the good old sub sprayn and used a combination of nylon scour pads and screw driver scrapping and at the end of this I was still not happy with the result especially on cylinder 1 and 4 value seat area that still had crusty bits despite my best efforts but I ran out of time.

    Putting it back together was a lot quicker but although I checked every sensor connectionn and had no spare bits I failed to hook up the MAF sensor, so when I started the car the first time it ran like shit I was very disappointed (understatement) I guess I was only focussed on the fuel and engine sensors

    As I replaced the injectors I can say that they tick like a diesel for a good few minutes so don't panic as I think they need to adapt to the ECU.

    The car is running good unfortunately because it was running bad for the last 5 months I can't empirically say the decarbon was worth the effort

    Not sure if this is useful but I had a couple of "accidents" along the way, first when I was putting the car up on body stands I left the last stand too close to the sill rail as I was measuring the need hight increase to fit it under the rail so when I jacked the car it angle into the stand and made a nice dent.
    I also replaced the front brake rotors and pads because you can never have too much to do and I was lucky that when I put the brake line bake on the caliper there was a leak I believe they are a crush washer as I tried many times to fix the leak with new standard washers that I had to file to spec, still leaking very slow so into a brake specialist tomorrow for the old girl.

    Still not sure if I had taken on enough work I changed the oil, filter and installed a fumoto oil drain valve, the place that changed the oil filter last must have used the biggest wrench to tighten the oil filter housing I am suprised it had not craked although I do have a nice little leak there now as well but hey I used the recommended torque of 25.5 nm so what would I know, I did an unscrew and rescrew this morning so I will have a look latter to see how successful I was.

    I will put up some photos of the ports and valves for before and after comparison a bit latter, suprisingly the injector heads looked fairly good compared to yours Alex one was light tan at the end which suggests a fair amont of heat and that may have been the broken one with intermittent fuel for cooling.
    2008 FSI Jetta 2.0T Tune by DriverMotorsport S2

  9. #19
    Senior Member barney91's Avatar
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    You should never rush this job. Its fiddly and frustrating at times.

    Hard to reach areas, dropping screws, re-cleaning ports, lack of light and fumes!

    Preparation, tools, environment and patience is all you need!

    Certainly made me a better DIY'r

  10. #20
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    Hi All,

    I have taken the manifold off my Tiguan to clean the carbon (lumpy idle and hesitation were my symptoms) tried all the other fixes first, coils etc.

    Barney91 - how did you get the injectors that stayed in the block? I have 2 that stayed behind :-(.

    Thanks

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