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LS1 (2002) spark plug change tips

This is a discussion on LS1 (2002) spark plug change tips within the General Help forums, part of the LSx Technical Help Section category; okay thanks I'll get some tomorrow and just leave the gap stock. Last time I changed the gap to the ...

  1. #21
    Senior Member JayTA98's Avatar
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    okay thanks I'll get some tomorrow and just leave the gap stock. Last time I changed the gap to the one that I read on a thread and the iddle really sucked. I'll give the TR55's another chance

  2. #22
    Senior Member JayTA98's Avatar
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    Advance only carries TR5's. Can I use those? and which one:TR5GP, TR5IX or TR5? It says to gap at .040, is that the gap I need or just put them in out of the box with no gapping?

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    What gap should I run when putting in the TR55's? Just leave them as they come?

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    Moderator Cutlass's Avatar
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    Napa has NGK TR55 also known as part number 3951. if the parts guy doesn't understand TR55 then ask for #3951.

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    Moderator Cutlass's Avatar
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    I gapped mine to .050"

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    Member Camaro69Mac's Avatar
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    Quote Originally Posted by JayTA98 View Post
    Advance only carries TR5's. Can I use those? and which one:TR5GP, TR5IX or TR5? It says to gap at .040, is that the gap I need or just put them in out of the box with no gapping?
    I just bought mine from advance i couldnt find tr55's i did some research and found the only difference is that the tr55's come pre gapped to .060 and the tr5's are gapped to .040....i put the tr5gp's in and re gapped them to our stock gap of 060 and runs great. I noticed a power gain cause my car had 105k and the plugs and wires were the orignals

  7. #27
    Senior Member JayTA98's Avatar
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    okay the question is do I need to gap the TR55's or can I just put them striaght from the box?

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    Member Camaro69Mac's Avatar
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    Quote Originally Posted by Cutlass View Post
    I gapped mine to .050"
    is there any reason you didnt gap them to the stock gap? I'm just curious i dont know the differences with gaps

  9. #29
    Moderator Cutlass's Avatar
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    Quote Originally Posted by JayTA98 View Post
    okay the question is do I need to gap the TR55's or can I just put them striaght from the box?
    You need to at least check them to make sure they are all the same.

  10. #30
    Senior Member JayTA98's Avatar
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    Quote Originally Posted by Cutlass View Post
    You need to at least check them to make sure they are all the same.
    Okay so it looks like the tr55's comes pregap at .060 which is stock. Thanks guys.

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    Moderator Cutlass's Avatar
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    Quote Originally Posted by Camaro69Mac View Post
    is there any reason you didnt gap them to the stock gap? I'm just curious i dont know the differences with gaps
    The stock gap is for platinum plugs. There are various reasons to change gap size including which plug you choose to use. On a stock or mild engine you won't see much power or driveability gain if the gap is anywhere between .040" and .060".

  12. #32
    Moderator Cutlass's Avatar
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    Quote Originally Posted by JayTA98 View Post
    Okay so it looks like the tr55's comes pregap at .060 which is stock. Thanks guys.
    Still gotta check them just in case one got dropped or slip past quality control with the wrong gap

  13. #33
    Senior Member JayTA98's Avatar
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    i will cutlass thanks

  14. #34
    LSX whore allbaugh_04's Avatar
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    That's weird, Advance should have them, sorry I steered you wrong.

    My advance had them...

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    i prefer a gap of .060 on my champion IR's

  16. #36
    Senior Member JayTA98's Avatar
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    Quote Originally Posted by allbaugh_04 View Post
    That's weird, Advance should have them, sorry I steered you wrong.

    My advance had them...
    Hey no worries. At least in the orlando ones don't have them.

  17. #37
    Senior Member JayTA98's Avatar
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    okay im sorry to bring this back again but I just pull my stock plugs and they are gapped at 040. I think they are platinums. Do I gap the TR55's to 040 or 060? I just dont want a bad iddle again

  18. #38
    Single Malt rbob93's Avatar
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    Gap them at .050 & forget it.

    The .060 gap is for PLATINUM & was intended as part of the emissions control.

  19. #39
    Senior Member JayTA98's Avatar
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    Quote Originally Posted by rbob93 View Post
    Gap them at .050 & forget it.

    The .060 gap is for PLATINUM & was intended as part of the emissions control.
    Ok i'll do .050. I just don't want to put them all on and have the bad idle issue that I had in the past. If I remember right I gap them at .055 at that time...

    I'll cross my fingers and trust you RBob

  20. #40
    Senior Member JayTA98's Avatar
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    Everything came out okay with the TR55's. Thanks for the gap Rbob. I had a open wire too. The idle is pretty sweet so far.
    Last edited by JayTA98; 04-29-2010 at 07:29 PM.

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