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Old 02-21-2012, 06:36 PM   #1
hvp014
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Default How To: R&R spark plugs 2.0L turbo

Just got done changing my spark plugs on my 9-2, little over due at 68k. Here's a helpful step by step...
Instructions are for a 2.0L Turbo engine, but will be similar for all models.

OEM spark plugs are: NGK 4793 or prf6g


Subaru manual recommends a 0.028-0.031 gap



Tools needed:
3/8 drive Ratchet
1/4 Drive ratchet
10" 3/8 drive extension?
3" 3/8 drive extension
10mm deep well socket 3/8 drive
12mm deep well socket 3/8 drive
12mm shallow socket 1/4 drive
5/8" spark Plug socket with rubber grommet
#2 flat head screwdriver
10mm Wrench
Spark plug Gapper
Dielectric grease
Anti seize




1. Disconnect Neg terminal.


2. Working on the passenger side first, unclip air box, MAF, and unscrew inlet hose clamp.


3.Remove 2 12mm bolts holding air box to body.


4.Here are the ignition coils, using the 1/4 ratchet remove the 2 12mm bolts.



5.Using the 3" 3/8 extension and 5/8" spark plug socket, remove both spark plugs.

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Old 02-21-2012, 06:37 PM   #2
hvp014
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6. Now to re install the new plugs, add a dab of anti sieze on the threads.


7.Before re installing the coils, add a dab of dielectric grease to prevent the boots from sticking to the plug.


8. Re install the coils, air box, MAF and tighten the inlet clamp and move onto the driver side. Here are the coils.


9. Remove the Battery, 2 10mm bolts hold the tie down and the clamps are 10mm as well. Pull the bottom cover up and out.



10.Here are your 2 12mm bolts holding the coils on. Use your 1/4 drive ratchet and 12mm socket.




11.Pull the coils up and out.
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Old 02-21-2012, 06:38 PM   #3
hvp014
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12.Once again using your 3/8 drive ratchet, 3" 3/8 drive extension and 5/8" spark plug socket remove both plugs.




13. Apply anti seize and install the new plugs.

14. Grease up the coils. Re install the coils, and re install the battery.


15. Turn the car over, look for a smooth steady idle, and grab a beer, it's all done! :beer:
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Old 02-21-2012, 06:38 PM   #4
hvp014
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Save for future updates.
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Old 02-21-2012, 06:53 PM   #5
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another nice writeup... btw No anti-seize needed on the plugs per NGK

http://forums.nasioc.com/forums/show...8&postcount=30
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Old 02-21-2012, 10:26 PM   #6
Uncle Scotty
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if you are gonna remove the battery....that should be included in step 1...waste of time to not do it while you are there
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Old 02-21-2012, 11:57 PM   #7
hvp014
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Quote:
Originally Posted by Uncle Scotty View Post
if you are gonna remove the battery....that should be included in step 1...waste of time to not do it while you are there
Thanks, I took the easier side first, and that's why I didn't remove the battery earlier. Either way its gotta go!

Quote:
Originally Posted by fastnoypi
another nice writeup... btw No anti-seize needed on the plugs per NGK

http://forums.nasioc.com/forums/show...8&postcount=30
Thank you for the heads up!

Hope this guide helps someone out!
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Old 02-22-2012, 12:21 AM   #8
txl146
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Nice write up and pictures.
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Old 02-24-2012, 02:15 PM   #9
Gro Harlem
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awesome, i'ma do the plugs when i change out my air filter this weekend. thx for the article! good pics & writeup
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Old 03-17-2012, 01:07 PM   #10
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Awesome write up, thanks. Doing the plugs on my Gf's 05 WRX and 'till now have only done the plugs on my 06 2.5 work car. Looks to be the same except for the battery removal. Thanks for listing the tools as well.
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Old 03-17-2012, 01:13 PM   #11
juventus1983
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How long did this take you?
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Old 03-17-2012, 03:37 PM   #12
ianison
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Good Writeup. Took me about 2 hours alone to replace the plugs on my 03. First time to do it on my car. This includes some some time took to clean my battery and around the filter area. I was slow with my ratchet though, I gotta get it fixed.. I'm sure there are speedier people there.

I did most everything on the engine with a 3/8" ratchet, but I removed windshield reservoir and battery with my 1/4". A flex head 3/8" would have made things easier, but I did mine with my regular ratchet.


I then did my gf's elantra and that took 20 min. geesh.
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Old 03-19-2012, 09:46 AM   #13
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Quote:
Originally Posted by juventus1983 View Post
How long did this take you?
All in all, a little over an hour.

Thanks for all the feedback, it will be different for every model, but this is a good general idea.
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Old 03-19-2012, 04:37 PM   #14
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Thanks for the info changed my plugs last night and this was a big time saver thanks
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Old 03-21-2012, 03:39 AM   #15
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Great pics, nice detailed explanation. I assume that this will not be much different for an '02 2.0? I just bought my WRX 9 days ago with 117k on the car. Timing belt will be done next week by an Indy shop and I will be doing the rest of the major service my self this weekend.
As an aircraft mechanic I appreciate your attention to detail.
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Old 03-26-2012, 09:18 AM   #16
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Thanks again, I'm happy if this guide can help at least one person out.

Quote:
Great pics, nice detailed explanation. I assume that this will not be much different for an '02 2.0?
Yes, they should be very similar, you will have the washer tank on the drivers side though. But we both have the 2.0L motors, so engine wise it will be the same.
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Old 04-09-2012, 11:07 PM   #17
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Thanks for this post... just tackled mine with great success.

One tip... I put some grease on the porcelain part of the plug, so I could easily remove the socket... otherwise it gets stuck and is a real mutherbitch to remove.
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Old 04-10-2012, 12:44 AM   #18
txl146
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Never over tighten plugs - it can turn into a nightmare easily if it snaps.
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Old 04-10-2012, 10:37 AM   #19
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Quote:
Originally Posted by scottjua View Post
One tip... I put some grease on the porcelain part of the plug, so I could easily remove the socket... otherwise it gets stuck and is a real mutherbitch to remove.
My solution to this is to use a length of air compressor hose to install the plugs instead of a spark plug socket, then tighten with a regular socket (no rubber retainer thingy).

It's easier to feel the threads engage and avoid cross threading.

Thanks for the write-up by the way.
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Old 04-17-2012, 01:52 PM   #20
Ham02wrx
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quick question did you have to jack the motor up any to clear the plug housings
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Old 04-23-2012, 09:34 AM   #21
hvp014
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Quote:
Originally Posted by Ham02wrx View Post
quick question did you have to jack the motor up any to clear the plug housings
Not in the 2.0, might be different for the 2.5, I cant say because I haven't done plugs in one yet. But again as for the 2.0L I did NOT have to jack the motor up.
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Old 07-28-2012, 10:17 AM   #22
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Subscribed for future use, and resurrection for a great guide.
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Old 07-29-2012, 10:40 AM   #23
itospeedz1
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its easy'er to get them from the bottom on the drivers side you dont have to take the battery out. or jack to motor. also recommend using the snapon double swivel spark plug socket.
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Old 01-09-2013, 08:49 PM   #24
Frankh21
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Thanks for posting up this walk through, especially the tools required for the job. I just did mine with your help and only had a bit of trouble with the one closest to the drivers side. Went with the same OEM NGK plugs. I snapped a couple pics of the old plugs.

[IMG][/IMG]

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Old 01-10-2013, 10:14 PM   #25
Elbert Bass
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Quote:
Originally Posted by Ham02wrx View Post
quick question did you have to jack the motor up any to clear the plug housings

No, Only Suby you really need to jack up for plugs is an H6. It's even easier of you use Snap-On S9721A socket - you can get all 4 from the bottom.
http://buy1.snapon.com/catalog/item....re&dir=catalog
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