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Old 09-07-2012, 10:16 PM   #1
CLL_OBP
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Default 2012 Impreza spark plug inspection

About 2 weeks ago @ 10,712 miles, I inspected my spark plugs. They were in very good condition compared to the plugs in my former 2009 Honda Civic EX after 10K miles. The Civic plugs were fouled really bad with carbon and they were NGK iridium also. Thatís why I wanted to take these out and take a look at them. I took out the driver side first (plugs 2 & 4) to get the hardest part out of the way.

#2 came out with no problem with a 3/8 drive, short extension and 9/16 spark plug socket. These are the longest threads I ever seen on a plug! (19)


#4 was the most difficult and it required some creativity with the tools I had on hand. I used a 1/4 hex to 3/8 square drill chuck adapter in order to have enough room:


I removed the airbox assembly and that gave plenty of room to work. #1 & #3 came out with no problem with a 3/8 drive and short extension.

#1:


#3:



Big gaping hole under the airbox. Perhaps a home for a cone filter, maybe:
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Old 09-07-2012, 10:42 PM   #2
79letour
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Thanks for a very helpful thread. I plan on checking mine at 15k-20k.
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Old 09-08-2012, 12:25 AM   #3
jr0bb5
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What is the scheduled mileage to replace the plugs, 30 or 60 thousand miles?
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Old 09-08-2012, 07:03 AM   #4
CLL_OBP
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Quote:
Originally Posted by jr0bb5
What is the scheduled mileage to replace the plugs, 30 or 60 thousand miles?
Every 60k miles. Doing a search, these plugs are priced between $10-$15 each.
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Old 09-08-2012, 07:17 AM   #5
CLL_OBP
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Quote:
Originally Posted by 79letour
Thanks for a very helpful thread. I plan on checking mine at 15k-20k.
Your welcome, it wasn't as difficult as I thought it would be with the small space you have to work with. That #4 is the oddball having to switch to a 1/4 ratchet. My shortest 3/8 extension is 3" so you would need one shorter than that or a really long 9/16 socket in order to use a 3/8 ratchet.
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Old 09-08-2012, 11:04 AM   #6
79letour
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30k, I believe
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Old 09-08-2012, 12:04 PM   #7
subiTWO
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Those look like HUGE gaps.
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Old 09-08-2012, 09:16 PM   #8
CLL_OBP
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Quote:
Originally Posted by subiTWO View Post
Those look like HUGE gaps.
I checked and they were within the 0.039 - 0.043 in. specs. It's the angle of the photo that makes it look huge.
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Old 09-09-2012, 03:59 PM   #9
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Quote:
Originally Posted by CLL_OBP View Post
I checked and they were within the 0.039 - 0.043 in. specs. It's the angle of the photo that makes it look huge.
Thanks.
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Old 11-11-2013, 05:09 PM   #10
bradze
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california emissions schedule requires changing every 30k, federal is 60k. ive had the socket spinning forever. how the **** do these come out? also how long do iridium plugs usually last?
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Old 11-12-2013, 09:43 AM   #11
CLL_OBP
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Quote:
Originally Posted by bradze View Post
california emissions schedule requires changing every 30k, federal is 60k. ive had the socket spinning forever. how the **** do these come out? also how long do iridium plugs usually last?
There is a typo in the Warranty & Maintenance Booklet. The second version in my glove box dated 10/2011 shows California and Federal schedule with Impreza 2.5L non-turbo spark plug replacement at 30k but the Impreza doesn't have a 2.5 in 2012. "All other" is 60k. In any case, iridium plugs last much longer than 30k so I would replace at 60k. I'm at 33,350 miles and have taken mine out to clean every 10k. They look fine at the half way point and yes, the threads are long so keep spinning
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Old 11-12-2013, 05:17 PM   #12
ocellaris
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Quote:
Originally Posted by bradze View Post
california emissions schedule requires changing every 30k, federal is 60k. ive had the socket spinning forever. how the **** do these come out? also how long do iridium plugs usually last?
Be careful, it is easy to strip plugs when dealing with hard to access plugs on a boxer engine. If you thinking something isn't catching or lining up correctly, figure out what the problem is before proceeding.

Side note: I stripped the block on an EJ22 years ago and didn't realize it. 1,000 miles later, the plug shot out of the block while I was driving.
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