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tune up

This is a discussion on tune up within the GTO forums, part of the Vehicle Specific category; i wanna do a tune up to my gto it have almost 42k is it time to change the spark ...

  1. #1
    Junior Member maher19403's Avatar
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    Question tune up

    i wanna do a tune up to my gto it have almost 42k is it time to change the spark plugs ?
    go with ac delco or NGK ?

  2. #2
    Smiles for 9.5 Years cammed goat's Avatar
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    IIRC, LSx motors come with iridium plugs and they are NGK from the factory.

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    Junior Member maher19403's Avatar
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    tune up

    do u think it time for a tune up ?

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    Smiles for 9.5 Years cammed goat's Avatar
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    Not yet. If your GTO is still runnin well, then leave the tune up til 50k.

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    Junior Member maher19403's Avatar
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    Thumbs up

    thanks

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    Smiles for 9.5 Years cammed goat's Avatar
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    No prob.

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    The original spark plugs arent NGK. They are AC DELCO, which is GM's plug...... unless somebody swapped AC's into my car and the manual is wrong which states a 41-985 ac delco plugs goes into our engines.

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    Member GTO1_OHIO's Avatar
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    Quote Originally Posted by 04cosmos View Post
    The original spark plugs arent NGK. They are AC DELCO, which is GM's plug...... unless somebody swapped AC's into my car and the manual is wrong which states a 41-985 ac delco plugs goes into our engines.
    Mine were iridium and were ac delco. That part number is a platinum tip. Don't doubt that that plug was the "standard" one though hsince it's good for 100,000 miles

    The main thing is many cars left the factory with mis-matching gaps on plugs. Different cars had different plugs depending on when they went down the line. The factory seemed to change parts all the time down there. lol

    From experience, I know that lots of early 04s dynoed 10-20 rwhp low because of this. ...the main thing to do if you still have factory plugs is to pull thenm and re-gap them.

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    I flame retards CamaroFan71's Avatar
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    I was shocked to see these cars dont have a servicable fuel filter. Says the filter must be changed with the pump? WTF??

  10. #10
    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    Quote Originally Posted by GTO1_OHIO View Post
    Mine were iridium and were ac delco. That part number is a platinum tip. Don't doubt that that plug was the "standard" one though hsince it's good for 100,000 miles

    The main thing is many cars left the factory with mis-matching gaps on plugs. Different cars had different plugs depending on when they went down the line. The factory seemed to change parts all the time down there. lol

    From experience, I know that lots of early 04s dynoed 10-20 rwhp low because of this. ...the main thing to do if you still have factory plugs is to pull thenm and re-gap them.
    Agreed!

  11. #11
    Senior Member JonB's Avatar
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    Quote Originally Posted by CamaroFan71 View Post
    I was shocked to see these cars dont have a servicable fuel filter. Says the filter must be changed with the pump? WTF??
    I did not know that, but im a newbie to the GTO. Thats kinda lame I changed my fuel filter on my z28 every 20k or so but it was no biggy it was as easy as changing the oil filter after a doing it a few times.

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    Senior Member qwkgto's Avatar
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    Quote Originally Posted by maher19403 View Post
    i wanna do a tune up to my gto it have almost 42k is it time to change the spark plugs ?
    go with ac delco or NGK ?
    If your car is stock just cross them over GM plugs,NGK or Autozone sells a iridium plug they all work great in the GTO.
    mods: custom built twins, built 408 w/l92 stock GM heads,GM matching intake,drag bags,frame ties,aluminum drive shaft, performabuilt 4l80e,Yank converter,ohios fastest and quickest 04-06 GTO 9.52 at 144mph. 1.50 60ft on stock rear end and shafts/suspension,on drag radials.

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    Senior Member qwkgto's Avatar
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    Quote Originally Posted by cammed goat View Post
    IIRC, LSx motors come with iridium plugs and they are NGK from the factory.
    I have to disagree mine had GM delco they were iridiums from GM,I change mine twice a year,regardless..best performance is my goal,gaps,plugs wires change em every year ,look at it this way the summer heat will kill those wires not to mention all the heat from the header/manifolds with under hood heat.,NGK plugs come with 2 year warrantee,MSD wires have a year.

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