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Thread: Carbon fouling on spark plugs

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    Patronist esandes's Avatar

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    Carbon fouling on spark plugs



    Could this be causing misfires?

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    Patronist esandes's Avatar

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    Patronist esandes's Avatar

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    Wow. I swapped in new plugs and the CEL didn't show up as it was constantly on for the past week. Car runs a hell of a lot better now.

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    Registered Member speed_demon24's Avatar

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    @ 3 ground electrodes.

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    What Would Oddjob Do? 5.0THIS's Avatar

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    Quote Originally Posted by speed_demon24 View Post
    @ 3 ground electrodes.
    That's worth like an extra 20 hp. Do you even torque your plugs bro?

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    Patronist esandes's Avatar

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    21 lbft boyo

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    Make it three yards... redy2kss's Avatar

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    Yes, that shitty beer could certainly cause a misfire.

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    Patronist esandes's Avatar

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    Quote Originally Posted by speed_demon24 View Post
    @ 3 ground electrodes.


    They're better for preventing carbon buildup. My thermostat was stuck open for a couple of years, not allowing the temperature to stay normal. That sure didn't help. The thermostat was recently replaced so the higher temperature should help to keep fouling at bay.

    The new plugs are one heat range cooler because of the performance mods (~40% more power than stock).

    These direct injection engines with EGRs and PCVs that discharge to the intake cause more bad than good.

    At least port fuel injection can help to clean the carbon from the EGR and PCV. It's too bad DI is now the norm. My dealership offers media cleaning. What the engineers need to do is use both port and fuel injection in order to reap all of the benefits.

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    Registered Member runningmole's Avatar

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    M44 in my bimmAr uses a 2 ground plug. They're copper, cheap & not having to adjust the gap means I can take my time & still be done in 15 minutes.

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    Patronist esandes's Avatar

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    Damn CEL came back on. Surely misfires. Direct injection sucks.

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    Quote Originally Posted by esandes View Post
    Damn CEL came back on. Surely misfires. Direct injection sucks.
    What car?

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    Registered Member Cerwin Vega Fan's Avatar

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    Quote Originally Posted by 98 SNAKE EATER View Post
    What car?
    I think he owns an Audi.

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    Quote Originally Posted by Cerwin Vega Fan View Post
    I think he owns an Audi.
    Time to break out the walnuts then

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    RIP Macky :( 94NDTA's Avatar

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    Quote Originally Posted by esandes View Post


    They're better for preventing carbon buildup.

    Obviously.

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    Patronist esandes's Avatar

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    Quote Originally Posted by 98 SNAKE EATER View Post
    Time to break out the walnuts then
    I'm actually thinking of going to the junk yard to pull a cylinder head, clean it and swap in and clean the other one. Repeat every 50k.

    I popped in new plugs and coil packs and it runs great now. It's shocking how quickly the plugs foul with dry carbon. When I'm on the highway now I cruise at 3000 RPM to help blow out that shit.

    The cost of a walnut shell blasting is around $800 at the dealership

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    Registered Member mogs01gt's Avatar

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    Could it be bad gas? Try running a higher octane.

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    Quote Originally Posted by esandes View Post
    I'm actually thinking of going to the junk yard to pull a cylinder head, clean it and swap in and clean the other one. Repeat every 50k.

    I popped in new plugs and coil packs and it runs great now. It's shocking how quickly the plugs foul with dry carbon. When I'm on the highway now I cruise at 3000 RPM to help blow out that shit.

    The cost of a walnut shell blasting is around $800 at the dealership

    To hell with the stealership, just diy

    Our kit was $125 bucks new and came with multiple intake attachments for BMW, VW/Audi, etc.

    A very good fix for a very stupid problem

    Bimmers tend to get carboned up faster (blasting is actually recommended every 20k miles.......no shit), but the Audi’s we’ve had came in for more serious problems (like jumping timing due to a sloppy chain, only to mash every valve in the head).

  18. #18
    Patronist esandes's Avatar

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    Quote Originally Posted by mogs01gt View Post
    Could it be bad gas? Try running a higher octane.
    It's direct injection with EGR and PCV discharging to the intake. I wish there was a mod to discharge it to the testpipe.

    I'm sure if the car was port fuel injected it would wash all that crap out.

    I use top tier 91. Shell mostly. The car has a 91 tune.
    Last edited by esandes; 11-13-2017 at 08:21 AM.

  19. #19
    Patronist esandes's Avatar

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    Quote Originally Posted by 98 SNAKE EATER View Post
    To hell with the stealership, just diy

    Our kit was $125 bucks new and came with multiple intake attachments for BMW, VW/Audi, etc.

    A very good fix for a very stupid problem

    Bimmers tend to get carboned up faster (blasting is actually recommended every 20k miles.......no shit), but the Audi’s we’ve had came in for more serious problems (like jumping timing due to a sloppy chain, only to mash every valve in the head).
    What a mess to do. I thought about getting ported heads to give an allowance for the gunk buildup with a special request for polished valves. Polishing the surfaces helps to keep the carbon from catching.

    I need to invest in coil pack companies.

    Also if the spark plug fouling continues despite the Italian tuneups I will use a higher heat range plug to help clean the carbon.

  20. #20
    Registered Member runningmole's Avatar

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    Quote Originally Posted by esandes View Post
    It's direct injection with EGR and PCV discharging to the intake. I wish there was a mod to discharge it to the testpipe.

    I'm sure if the car was port fuel injected it would was all that crap out.

    I use top tier 91. Shell mostly. The car has a 91 tune.
    Have you researched a catch-can? DI motor in my gf's car doesn't even have an actual PCV. There's a vent tube from the valve cover though. I'm sure the more throttle percentage is used, the more oil & vapor is sucked in to the intake.

  21. #21
    Patronist esandes's Avatar

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    Quote Originally Posted by runningmole View Post
    Have you researched a catch-can? DI motor in my gf's car doesn't even have an actual PCV. There's a vent tube from the valve cover though. I'm sure the more throttle percentage is used, the more oil & vapor is sucked in to the intake.
    I have and it's not for me because it still passes some of the gas through. No separator has 100% recovery plus I heard some bad things about them like freezing of moisture causing blockage of the crankcase breathing-which blows out seals.

    Some Audi aftermarket places even offer PCV block kits...bad idea.

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    Registered Member mogs01gt's Avatar

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    Wait, this is an Audi? Im out!

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