Spark plug gap - Subaru Forester Owners Forum
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post #1 of 20 (permalink) Old 08-14-2010, 09:15 AM Thread Starter
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Spark plug gap

Any of you guru's know what spark plug gap I need for a MY57 forester 2.5xten?

TIA

Andy
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post #2 of 20 (permalink) Old 08-14-2010, 09:49 AM
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You'll find the plug info in this document.................
http://www.subaru-car.ru/for4/for4_sec2_9.pdf


If you look around the site you may find other info that will be of interest

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post #3 of 20 (permalink) Old 08-14-2010, 09:58 AM Thread Starter
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Cheers for that Don.

Oh and yes, I am aware of the search function but being new here it's nice to actually exchange threads with other members
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post #4 of 20 (permalink) Old 08-14-2010, 10:12 AM
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I was talking about the site where the document came from

If necessary put it through a translater like Altavista

Was a MY03 FXT 5MT (280bhp/290Lbsft)
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post #5 of 20 (permalink) Old 08-14-2010, 11:36 AM
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I am going to be brave and query the Prof PDF

I have recently been checking on spark plugs for the first change at 50k and according to NGK the 05-on 2.5 has a different plug, ILFR6B. The gap is listed as "preset" so I assume it is not adjustable.

Am I Right?

Max.

2005 UK XTEn 4EAT sports shift

Last edited by agkq62; 08-14-2010 at 12:56 PM.
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post #6 of 20 (permalink) Old 08-15-2010, 04:34 AM
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Standard plug for the 2.5L turbo is a ILFR6B

Was a MY03 FXT 5MT (280bhp/290Lbsft)
Now a MY11 WRX STi 4door (342bhp/360Lbsft)
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post #7 of 20 (permalink) Old 08-15-2010, 11:54 PM
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Thanks for the confirmation Don. The pre 05 2.5L has a different plug listed by NGK. What do it mean when the gap is "preset"?

Thanks,

Max.

2005 UK XTEn 4EAT sports shift
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post #8 of 20 (permalink) Old 08-16-2010, 12:02 AM
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Quote:
Originally Posted by agkq62 View Post
What do it mean when the gap is "preset"?
Set to manufacturer's spec by default... always worth checking before fitting though.

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post #9 of 20 (permalink) Old 08-16-2010, 02:07 AM
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A lot of new Platinum spark plugs will be damaged if you try to gap them like you would for an older car. Gapping a spark plug is going to become one of those traits that we all lose the skill for... Kinda like the ability to read a water gauge, check your oil level, and this thing called a "manual choke" (***?).
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post #10 of 20 (permalink) Old 08-19-2010, 03:28 AM
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Quote:
Originally Posted by Gigsy View Post
Set to manufacturer's spec by default... always worth checking before fitting though.
They are never all the same when they say "preset"

Buy yourself a "Champion spark plug coin" rather than using feeler guages.



the iridium plugs have very brittle electrodes so be careful.

Put it in "D" for "Do It" and hit the noise pedal
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post #11 of 20 (permalink) Old 08-19-2010, 03:39 AM
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^^ that's a cracking little gadget

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post #12 of 20 (permalink) Old 08-19-2010, 04:48 AM
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You can still gap iridiums if you do it by bending the arm. Don't do it by shoving the ramp between the parts and spreading them, this WILL damage the electrodes. The oem iridiums should be pretty close to the correct gap.

IIRC the gap is around .030" for turbo models.

04xt/4eat, 16g, STI bits and bobs
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post #13 of 20 (permalink) Old 08-19-2010, 08:31 AM
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I agree! Carefully use a wire gauge when gapping or checking iridium spark plugs, since the center electrode is very brittle. You'll be surprised how much the pregapped plugs will vary.

Bobby...

['07 FSXT MODding Journal] ['03 X MODding Journal]

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'03 X +AVO turbo kit = XT (son's)
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post #14 of 20 (permalink) Old 08-19-2010, 11:26 AM Thread Starter
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I will deffo go for the Iridium plugs. Is it worth upgrading the plug leads too or will stock suffice?


Andy
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post #15 of 20 (permalink) Old 08-19-2010, 11:28 AM
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Quote:
Originally Posted by Andy Keeble View Post
I will deffo go for the Iridium plugs. Is it worth upgrading the plug leads too or will stock suffice?


Andy
What plug leads???

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