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Gasoline always in the spark plug port

Discussion in 'Fred's House of Pancakes' started by Dxta, May 11, 2018.

  1. Dxta

    Dxta Senior Member

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    I have got a Nissan Infiniti 2004 V8 that I have recently rebuilt. After rebuilding it, I noticed that when cranking it to start em, it delays, and sputters at the airflow housing area. I do know its a timing issue, which has being sorted out today already. But my concern right now is that, I have suddenly noticed gasoline filled up in #2cylinder spark plug port. I initially thought it was a faulty duel injector on that #2. So I did swapped that with #6, and found the problem was still there. I also unplugged the injector connector, to see what happens.

    What could be the likely cause of the gasoline gushing out from the spark plug port, without the other cylinders not bring affected?

    Thanks for the responses
    Cc: @danlatu

    Dxta


    PS: Planning to remove the top cylinder this week, to asses it and see what could be the problem.
    I pray it isn't the cylinder head around the injector port that's cranked.
     
    #1 Dxta, May 11, 2018
    Last edited: May 11, 2018
  2. Kevin_Denver

    Kevin_Denver Active Member

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    It sounds like the spark plug is not sealing into the cylinder. I would do a cylinder compression test on that cylinder to check for problems.

    If this is true, all is not lost. There are kits out there to bore the spark plug hole larger, then use a sleeve to mount the factory spark plug.
     
    #2 Kevin_Denver, May 11, 2018
  3. Mendel Leisk

    Mendel Leisk Senior Member

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    Just curious: how would you deal with shavings, drilling a larger hole? Vacuum and boroscope?
     
    #3 Mendel Leisk, May 11, 2018
  4. Trollbait

    Trollbait It's a D&D thing

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    If it's an iron engine, you can stick a strong magnet on the drill bit while drilling.
     
    #4 Trollbait, May 11, 2018
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  5. Dxta

    Dxta Senior Member

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    Its an aluminum block and cylinder head.
    The problem is just that its only #2cylinder spark plug port that keeps being flooded with gasoline.
     
    #5 Dxta, May 11, 2018
  6. Dxta

    Dxta Senior Member

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    Thanks for your reply. The engine was recently rebuilt. Piston rings replaced and all that. This problem always occurs only on #2 spark plug port. The spark plug in there always gets flooded with gasoline up to the level that the spark plug ceramic electrode is immense in gasoline. I have not being able to properly seat the rings after the overhaul, because I'm scared of fire hazards that might happened.

    Can the ECU in your view, cause this problem?

    In my experiences, I have seen Nissans having all their fuel injectors flooded with gasoline, as a result of bad ECU.
     
    #6 Dxta, May 11, 2018
  7. Kevin_Denver

    Kevin_Denver Active Member

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    The way I'm understanding your original post is that you're seeing gasoline around the spark plug on the exterior of the engine. The spark plugs should form an airtight seal with the top of the engine. Even if the fuel injector were jammed on (bad ECU, injector, or wiring), I wouldn't expect gas to come through this seal, it would simply make the engine run rich/misfire and send raw gas out the tail pipe. In your shoes, I'd run a compression test on that cylinder prior to testing other theories (even if the rings aren't broken in, you should be able to get close to factory values). I'm not familiar with Nissans however, so I'd post on some Nissan forums and see what they say.

    Also what I understand is that sometimes a generous dose of anti-seize designed for spark plugs can help them seal more tightly/completely. It's worth a try to do this if the compression test comes back bad.
     
    #7 Kevin_Denver, May 11, 2018
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  8. Dxta

    Dxta Senior Member

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    I forgot to also add. The catalytic converter on that bank was dammed red, as a result of gasoline flooding also untge exhaust.
     
    #8 Dxta, May 11, 2018
  9. edthefox5

    edthefox5 Senior Member

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    #9 edthefox5, Jan 22, 2022
  10. mikefocke

    mikefocke Prius v Three 2012, Avalon 2011

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    Yes, dump raw gas into a CAT and the O2 sensors fry and the car glows.

    Could it be that the wire to the plug is bad and you get no spark thus gas doesn't get burned. Be careful testing.
     
    #10 mikefocke, Jan 22, 2022
  11. sam spade 2

    sam spade 2 Senior Member

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    Thread is a bit over 3 years old.
    OP has logged on recently.......but has not seen fit to update this thread.
    :(
     
    #11 sam spade 2, Jan 22, 2022
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