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  1. #1
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    1 out of 1 members liked this post. Yes Reputation No

    Opinions on my plugs 20k miles cylinder 6!

    Hey everyone, these were pulled off my car last night due to high load Misfires. All the plugs look fine except for cylinder 6 on the far right. Was curios if people think that my injector is toast? I had them replaced 20k miles ago with the plugs. Cylinder 6 looks super black compared to the rest.

    Click here to enlarge

  2. #2
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    Cylinder 1 and 6 both look pretty bad.

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    Click here to enlarge Originally Posted by themyst Click here to enlarge
    Cylinder 1 and 6 both look pretty bad.
    Another Angle.

    Click here to enlarge

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    Click here to enlarge Originally Posted by joec500 Click here to enlarge
    Another Angle.

    Click here to enlarge



    Damn, that's black. Not sure what else it could be...

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    So what is causing this?

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
    : http://www.boostaddict.com/showthrea...r-kit-for-sale

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    I would say valve cover gasket, but the threads are fine. In this case, it could be a leaking injector.

    Do you have any rough idles that smooth out after a cold start?

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    I had the same issue on my car.. Cyl#1 looked like $#@! & cyl6 was black from fuel... I just replaced cyl # 1 injector last night and cleaned up all the plugs.. I also swapped coil packs with cyl 5&6.. I will pull the plugs out tomorrow and see what they look like..

    @themyst - I have the rough cold start then smooths out.. Didn't change with the new injector and didn't do it when I unmarrried the Cobb ap.... Have the rough start with map 0 on the AP with only 93oct and my tuned map with 50/50 e85/93...

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    Click here to enlarge Originally Posted by themyst Click here to enlarge
    I would say valve cover gasket, but the threads are fine. In this case, it could be a leaking injector.

    Do you have any rough idles that smooth out after a cold start?
    They are not super rough, but once it settles to 600RPM, you can hear it sputter every 10-20 seconds or so, I have seen videos with similar sputtering noises. Sometimes it gets so rough that the RPM's go up to about 800 or so, I am guessing to rev out the little mis-fires.

  9. #9
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    Injector IMO.... both times in my 135i where injectors were failing my plug looked exactly like yours... Valve cover gasket as myst says would leave oil residue on the threads as well

    My buddy as BMW also told me almost always when its a black plug its a sign of the injector not functioning as it should... If your car had more miles I would consider the valve cover gasket as a possibility but I think its your injector, but thats just my opinion

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    I have the exact same issue on cylinder 1 with the plug discoloration. I have a couple rough spots on the idle upon startup and it seems to go away after the car is warmed up. Has anyone proactively replaced the injector to try and solve it? Mine were all replaced under the recall already, so I will probably do this one on my own.

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    try this, it always did some improvements for me:


    -run a bottle of techron through your car for 2-3 gas station fill ups
    -techron costs $8 a bottle, and it seems to solve injector issues even on the DI system

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    also, try my highway technique: drive for 15 mins at 4-5k rpms consistantly. it will burn off some carbon from your injector tips. i did this once a month on the way to work. my car idled perfectly, never stumbled on startup, or had any other issues really.

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    I had two plugs look like that , each time I replaced that perticular injector and never got the "black" plug back, but I would try to do the things mentioned above first. Obv buying a 100-200 item should be done after you exhaust the cheap attempts at a solution.

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    Click here to enlarge Originally Posted by mj6234 Click here to enlarge
    I have the exact same issue on cylinder 1 with the plug discoloration. I have a couple rough spots on the idle upon startup and it seems to go away after the car is warmed up. Has anyone proactively replaced the injector to try and solve it? Mine were all replaced under the recall already, so I will probably do this one on my own.
    Yes, I proactively changed injector #1 the other day as I had the SAME issues you had. #1 spark plug looks great now but I still have the rough idle on startup ( I think injector #6 is starting to go)

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    Click here to enlarge Originally Posted by boosted-M Click here to enlarge
    Yes, I proactively changed injector #1 the other day as I had the SAME issues you had. #1 spark plug looks great now but I still have the rough idle on startup ( I think injector #6 is starting to go)

    Cool. It looks like a new injector is $100, and I have INPA set up. I know the decoupler has to be done with the injector, any other challenges? I know some fuel leaks out when you disconnect the hard lines, but otherwise seems pretty straightforward. Have swapped port fuel injectors in other cars before, and this seems about the same.

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    a)Leaky inj
    or
    b)coil on the bubble

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    sounds good, it appears that it's really just one injector. I swapped the plugs and things seem ok, but perhaps it's because plug #6 is not fouled yet. I will order a new injector and possible a new plug.

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    I replaced injector#1 then the following week injector #5 & #6 that took a nose dive. After the injector replacement, all of my spark plugs are burning the same!

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    I've seen that with a bad injector. It still works, just not well. JoeC- pull the #6 plug again, see whether the new plug is also sooty. They should all look like 1-5.
    James Muskopf
    RRT Racing
    2007 E92 335i/6MT Procede Rev3 w/PWM meth, otherwise stock
    E28 M5, R171 SLK320

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    Click here to enlarge Originally Posted by JamesM3M5 Click here to enlarge
    I've seen that with a bad injector. It still works, just not well. JoeC- pull the #6 plug again, see whether the new plug is also sooty. They should all look like 1-5.
    That's the plan, once I get my car back from FFTEC for the FlexFuel Kit and LSD install. Click here to enlarge I have a brand new injector on standby.

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