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  1. #1
    doughnutter
    Join Date
    Jan 2013
    Posts
    67

    missfire + oil in spark plugs.....what happened?

    hey guyz i have a ca18det recently changed the turbo wich i think might be a bit overboosted(stock engine+t25) , did a few runs and suddenly a missfire is taking place before 2000rpm, i also noticed a small lost in power. Checked spark plugs, found some oil, what to do? what could it be? i'm afraid i might need a rebuild as i have an oil leak in the head....

  2. #2
    tail slider
    Join Date
    Nov 2011
    Location
    New Zealand
    Posts
    119
    Compression test would be first thing to do

  3. #3
    touge runner
    Join Date
    Nov 2013
    Location
    northern ireland
    Posts
    218
    Is there any oil in the inlet manifold pipe?
    are you sure its oil and not petrol? eather way if the plugs have been wet with oil or petrol you will have to change them, thats where i would start and if when new plugs are in and you see the slightest miss out of it cut the engine and see if there is still oil-petrol on the plug's?
    hope this helps

  4. #4
    doughnutter
    Join Date
    Jul 2012
    Posts
    38
    Quote Originally Posted by 1N5_N15 View Post
    Compression test would be first thing to do
    I agree,check compression first,could show many issues.

  5. #5
    doughnutter
    Join Date
    Jun 2008
    Posts
    30
    Or test it with a leakdown tester

  6. #6
    9.17 BtG. Too slow.

    Join Date
    Jul 2004
    Location
    Essex
    Posts
    9,094
    Quote Originally Posted by 200sx-s13-1993 View Post
    if the plugs have been wet with oil or petrol you will have to change them
    Or just clean and dry them.

    Quote Originally Posted by scouse View Post
    I was so scared before i went out on track it was unreal in fact i was so bad i had to take a shit

  7. #7
    tail slider
    Join Date
    Nov 2011
    Location
    New Zealand
    Posts
    119
    Quote Originally Posted by turbosteen View Post
    Or test it with a leakdown tester
    Do this next if compression test results are not correct

  8. #8
    spl dori master
    Join Date
    Jun 2008
    Posts
    366
    Have you recently filled it with oil? I did that once with my CA and due to the location of the oil filler you tend to get spillage down the cylinder no 1 coil/sparkplug hole? Would definitely cause a misfire.

  9. #9
    dorifto kingu!
    Join Date
    Feb 2006
    Location
    Lincoln
    Posts
    2,600
    Sure its not oil from leaking cam covers thats sat in the plug wells?

  10. #10
    spl dori master
    Join Date
    Aug 2012
    Posts
    412
    Which end of the plug?? Melted piston? Head gasket??

  11. #11
    gripper
    Join Date
    Oct 2013
    Posts
    3
    First do a compression test to be sure for your valvetrain(mainly the valves)and the piston rings.How many kilometers do you have with these spark plugs?

 

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