How to change your sparkplugs - Page 16
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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; Thanks WRXers! Replaced the spark plugs today with very little problems. Just a reminder, you have to take out four ...

  1. #226
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    Newbie to the Subie maintenance!

    Thanks WRXers! Replaced the spark plugs today with very little problems. Just a reminder, you have to take out four plugs if you want to put four in. We got so excited when we saw the passenger side and how much easier and experienced we were after doing the drivers side. We....er....I forget to take the passenger side rear plug out and could figure out why in the H the new one wouldn't go in! It only took about 20mins and me asking, "Let me take a look at all four plugs.", and then another 5 minutes looking for the D thing!

    Also replaced the front pads before the snow flies!

    Thanks again....and yes...you call all laugh now!

    (BTW this was my first attempt at any engine maintenance on a Subaru....I must say...It wasn't that bad....this forum makes it easy!)


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  3. #227
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    Do you think using and ngk iridium plug heat range 9 is too cold a plug to use on a wrx that has full 3 inch exhaust, 3 inch down pipe, upgraded up pipe, boost controller at low boost 11psi and high boost 17psi with water injection only using water. Also what plug gap should I put them at in mms since my plug gap tool is in mms.lol.

  4. #228
    Moderating on the run! Big Sky WRX's Avatar
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    might be better asked in the engine forum, I can change plugs but no expert on what the best ones are for specific applications
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  5. #229
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    I've read that if you are 100HP over stock (at the crank), you should go 1-step colder. Otherwise, you should stay in the stock heat range.
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  6. #230
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    Quote Originally Posted by Big Sky WRX View Post
    Next we'll remove the airbox. We'll disconnect the hose connecting the airbox to the turbo inlet hose. Then we'll disconnect the connector to the MAF sensor (see pic). Then we'll remove the upper half of the air filter w/ the filter.

    helo~

    wana to ask you, in your picture it have cap right?what is that?is it same like cap for radiator?? thanks

  7. #231
    Registered User LIV 2 RLY's Avatar
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    No, the airbox does NOT have a cap similar to the radiator. The airbox is the large black box on the passenger side of the car which contains the air filter. It can be removed by unplugging the MAF sensor, removing the 2 vacuum lines off the top and then removing the hose clamps off the elbow piece. This would be a good time to change your airfilter.

    FYI, the black vessel with the radiator cap is a coolant overflow tank - it is NOT required to remove this to change the spark plugs.
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  8. #232
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    Thank you so much for the post. I just replaced my spark plugs today. First time i've ever done spark plugs. Didn't even know where the darn things were till I saw this. Thanks!!

  9. #233
    Moderating on the run! Big Sky WRX's Avatar
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    glad it helped and welcome aboard!
    "Simplify and add lightness." - Colin Chapman

  10. #234
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    once i got the feel of the spark plugs on the spark plug socket it was easy, i did make the hole in the rubber part of the spark plug socket slightly bigger as it kept coming off when I would try to remove the socket when the spark plug was secure.

    write up made it easy, thanks for saving me at least $150 in labor

  11. #235
    Moderating on the run! Big Sky WRX's Avatar
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    ^ glad it helped
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  12. #236
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    WOW, great information.

  13. #237
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    Just changed my Plugs over the weekend using this guide and everything went smooth. It actually went a lot quicker than I thought that it would. this is a great write-up and came in very handy. thanks

  14. #238
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    Was under the car over the weekend (unrelated but I looked for plug strategies). Not much to be gained at all by trying to do the plugs from below. It's as if the bay tightens on the lower side. The two rear plugs are not IMO easy from below, they are easier from up top.
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  15. #239
    Moderating on the run! Big Sky WRX's Avatar
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    glad it helped

    ^ agreed- I looked under as well
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  16. #240
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    I don't know if anyone has mentioned this throughout this thread as there are a ton of pages to look through, but mine is a stock '05 does this explanation to change the plugs apply to my year model?

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