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Thread: Sooo... It's breaking down in 5th and 6th gear

  1. #1

    Default Sooo... It's breaking down in 5th and 6th gear

    So I changed the spark plugs today to a Ngk iridiums.. Now the car is breaking down in 5th and 6th gear at approx 3000-3100 it's like a miss at that rpm.. Has anybody else experienced this problem? I havnt changed anything else and everything is back the way it should be.. Could it be a dud plug? Have I bumped something? Is ngk a shit plug for them? Reason I changed them was because they were still the same ones from new!!

    Any help would be greatly appreciated

  2. #2
    Join Date
    Aug 2011
    Location
    Sydney North
    Posts
    441

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    Did u gap them correctly?

  3. #3

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    NGK Iridium's are normally very good quality. Did you gap them properly?

    Quote Originally Posted by Rob777 View Post
    Did u gap them correctly?
    Beat me to it
    SG9 XT: VF34 P20, Tomei headers, STI intercooler HSD coilovers, Brembos and much more...

  4. #4

    Default

    Sorry boys I didn't gap them.. Dammit normally I would too but I thought nah she will be right.. So u think it's blowing the spark out just at that rpm in those 2 gears? What should the gap be? 0.8?

  5. #5

    Default

    Quote Originally Posted by TI55HU View Post
    Sorry boys I didn't gap them.. Dammit normally I would too but I thought nah she will be right.. So u think it's blowing the spark out just at that rpm in those 2 gears? What should the gap be? 0.8?
    Check your owners manual, might be in there?

    Otherwise I know my NGK (Iridium, 1 step colder) are to be gapped at 0.71mm. If they are the stock thermal range it might me more/less.
    SG9 XT: VF34 P20, Tomei headers, STI intercooler HSD coilovers, Brembos and much more...

  6. #6
    Join Date
    Aug 2011
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    Sydney North
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    I had tune house gap my NGK at .71 as well

  7. #7
    Join Date
    Apr 2010
    Location
    Canberra
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    9,459

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    0.026"

    Sent from my Nexus 5 using Tapatalk

  8. #8
    Join Date
    Aug 2009
    Location
    hunter valley
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    6,403

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    Mine are 0.026' depends on how much boost your putting in. I got spark blow out with high boost 0.029 bnrs3..

  9. #9

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    Yep set the gap.. The flops at the local spares shop sold me a 1.3 gap plug.. Didn't tell me.. So they gave me a set of feeler gauges for my troubles and they were surprised when I already knew how to use them!! Haha

    set it to 0.026" and runs better than ever!!

    thanks for all your help guys!!

  10. #10
    Join Date
    May 2009
    Location
    Bathurst
    Age
    42
    Posts
    1,930

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    Not the shops fault. Spark plugs do not come pre gapped. You should always check them

  11. #11

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    Even if they are pre-gapped check it twice to be sure

  12. #12

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    Yes I should but when we looked them up in the book the gap said 0.8... She grabbed 1.3 yes I should have checked but she also grabbed the wrong ones

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