How to change your sparkplugs - Page 7
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This is a discussion on How to change your sparkplugs within the Maintenance, service, and repair forums, part of the Tutorials & DIY category; Well at my pepboys the stockers list for 28.11 each (which means the sell price is around 14 each). I ...

  1. #91
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    Well at my pepboys the stockers list for 28.11 each (which means the sell price is around 14 each). I bought a set of the iridiums (not the -11 ones) at 7.00 ea. I used the same gap tool in the picture above to check them, they are at .25. I gapped them to .30 carefully, not putting pressure on the tip but using the lip of the grounding electrode to pull up slightly with the gapper's edge (actually the tool is called "the gapper"). You have frightened me that I may be damaging the tip even if I touched it gently with the gapper. I dont see any damage and I was very careful. I'm really thinking of getting a feeler gauge to check the gap because of the incline. If I dont see any damage, you dont think I did anything to them do you? I looked and looked on many sites, but I couldnt find any definitive information on the process of gapping these types of plugs other than the "be careful" warning. If I keep the gap to .29-.30 I should have any issues right? I had to touch the center electrode with the gapper to make sure I was in spec, but I was gentle and slow about it. Whats the consensus on that? I could see if you used a prong to gap and wedged it against the iridium tip how it would break, but I didnt do anything of that nature. Hell, they're goin to get hit by some pretty hot explosions in the chamber anyway if anything should break something that fragile, that should... I dont want to have to go yanking plugs back out since they're not the easiest to get to.
    BTW, mostly stock I am yes....
    j

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  3. #92
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    http://densoiridium.com/installationguide.php

    oh well, i already gapped the damn things from .25 to .30. I cant see any damage after close inspection. i guess i'll install them tomorrow and find out. The ONE thing that would scare me about a plug like this is if the tip were to break off into the combustion chamber. That tiny tip could score the wall or cause other damage. i used similar ones in my sentra and i got oem performance, and thats all I want from something like this.

  4. #93
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    For those trolling looking for some good specific plug info on the following.

    NGK Iridium BKR6EIX (Stock 6418 at Pep Boys) 6.99 ea for EJ20

    I just installed these. They come stock with a 0.25" gap. After reading that they might be outside the gap for a WRX, I gapped them. People warn not to gap iridium but if you are super careful, you wont have a problem. I gapped mine to a 0.29/0.30.00000000000

    Do NOT put a gapping tool between the center and ground.
    Do NOT force a gap checker inside the center and ground space. If it doesnt slide in easy, DONT FORCE.

    Gap by pulling up on the lip of the grounding electrode with a gapper OR use a pair of fine pliers to lightly tug the sides of the center ground. You dont need too much force. Tap the ground electrode on a piece of wood to close the gap. The best way to check the clearence is measure with a wire gap checker. Use the .28 and keep it off the iridium tip. Do this over a white surface so that you can see the hairs width of space from the .28 wire and the head of the center electrode to ensure its a .29. Make sure the gap is close enough that a .30 will NOT fit in and that a .28 will fit in and leave a seriously small hair's width of space between the measurement wire and the tip of the iridium. You may notice that after the iridium tip is exposed to breath, or air, that it tarnishes quickly. Dont let that alarm you, it freaked me out but it seems that iridium tarnishes from the silver color on the boxe's picture to a dark color easily.


    My car is running fine. No misfire, no sputter, like stock. My driver's side stockers with 62k on them were NEEDING the replacement.

  5. #94
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    I was just curious if the flex spark plug tool you used was a 5/8 socket. I am pretty sure that is the size the NGK plug takes but there are so many sizes out there that I just wanted to make sure.
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  6. #95
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    5/8" is correct
    "Simplify and add lightness." - Colin Chapman

  7. #96
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    Thanks you! this write up is perfect!

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    bows humbly
    "Simplify and add lightness." - Colin Chapman

  9. #98
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    Thanks too

    If I had put pics up here, I probably could have made this a sticky, I'll see what I can come up with....

    j

  10. #99
    Registered User sigurd's Avatar
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    Just did mine over the weekend. Not a bad job at all.

    I put the NGK iridiums in it. I checked the gap with a feller gauge and they were fine so I left them. Car is running great. I had 70k on the originals.

    I still dont understand why the iridiums are cheaper than the oem double plats but oh well I dont really care I guess.

    Oh and good guide I read it before I started and had no issues

  11. #100
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    Great write up, I am doing my plugs this weekend.
    Tuned by Jorge at P&L, 240.83whp 239.60wtq at 14.8psi on 2.0L with stock td04 (But doesn't run)

  12. #101
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    Thanks!

  13. #102
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    Thanks for the write up in this thread. As I'm new to the SUBY world. Changing my plugs was extremely easy. I went with a set of copper NGK 6097's.
    EDIT: Subaru is way nicer/better than a older Ford Mustang!!

  14. #103
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    Denso plugs

    Quote Originally Posted by AjIsDope View Post
    Densos are good, I used them on my Accord. I wouldn't recommend them for the WRX though as I have heard they break apart. Stick with the NGK's and you can't go wrong.
    I just bought the denso iridium plugs against my will what do you mean they break apart?

  15. #104
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    great post

    Just finished about an hour ago i did the plugs for the first time on a suby went to oriellys and bought the factory pfr6g plugs for 9.88 a piece. The whole job including four new slotted rotors, 2 sets of pads, and the plug change took about three hours with a lunch/beer break. No swivels needed found it very easy with the craftsman ergo grip flexhead 3/8 ratchet, 3 inch regular extension, and i took the rubber out of the 5/8 spark plug socket

    Thanks for the pics they helped me understand what i was doing before i tore into the project

  16. #105
    Moderator YBNormal07's Avatar
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    Quote Originally Posted by gda03subaru View Post
    I just bought the denso iridium plugs against my will what do you mean they break apart?
    No they don't...not by themselves. All plugs can break if the tool being used on them is smarter than the operator.
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