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Spark Plug Install Instructions


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  • 2 weeks later...

just got my order in from fredbeans. got 5qts of subaru ATF, 5 qts of the synthetic S diff fluid, and a box of NGK LFR6AIX-11 6619 Iridium plugs. They have cardboard collars on them which is supposed to indicate they are pregapped and yet they are gapped at .044?? what gives? shouldn't they be gapped to .030? why do i keep getting the wrong plugs wtf. this is for on 05 LGT

 

-Luke

 

EDIT: NVM, spoke with a guy at fredbeans. the NGK Iridium ones they sell are generics and do not come pregapped for the application. So they come in gapped at .044. they do however sell NGK plugs that ARE gapped for your application(i didn't even notice these when i ordered) but they are 15 bucks more expensive. So looks like i'll be careful and gap these myself down to .030. Oh well.

Edited by lkailburn
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NGK one step colder I bought came pregapped. You were sold wrong plugs. -11 is wrong plug, I believe.

 

The idea of adjusting gap on iridium tiped plugs bugs me.

Edited by unclemat
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NGK one step colder I bought came pregapped. You were sold wrong plugs. -11 is wrong plug, I believe.

 

The idea of adjusting gap on iridium tiped plugs bugs me.

 

agreed. the angle of a pregapped plug will be close to 100% correct. the angle of a self-gapped plug will NOT be 100% correct. grr wtf i'm peeved. this is the second time i've come up with a set of .044 plugs sold to me as LGT plugs. if it's not supposed to be -11 what is is supposed to be?

 

-Luke

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You want SILFR6A (just like stock, has platinum on the electrode), or ILFR6B (without platinum on the electrode).

 

Here's what I got:

Thank you for your order at Sparkplugs.com. Below is a summary of your order for your records:

4 - NGK IX iridium

Stock Number: 2309

Part Number: LFR7AIX

 

Seemed to be just like the originals, and worked fine.. (for 20+K so far)

 

Interestingly enough, according to sparkplugs.com, there are different brands of plugs, with DIFFERENT OE gaps for our car..

http://www.sparkplugs.com/results_app.asp?productTypeID=1&AAIA=1430733

 

Autolites are pre-gapped to 0.040, Denso to 0.035 and Champion and NGK to 0.030.

 

Does this mean they're all equivalent (i.e. Autolite plugs are slightly different and will work in the LGT at 0.040)?

 

On the other hand:

http://www.sparkplugs.com/results_cross.asp?pid=lfr7aix&x=0&y=0

Shows that lfr7aix are pre-gapped to 0.032.

 

The SILFR6A are listed as "extreme long life", while the LFR7AIX are not. Given that I'm changing 'em every 30-40K anyway, does it matter? The LFR7AIX are one step colder (I'm stage 2), and 2/3 the price of the SILFR6A. They don't list an SILFR7A...

 

Wow - "traditional" champion plugs are less than $3 each, $2.89, SILFR6A are $12 each. Not that I'd get anything but NGKs...

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I did, he was the one who told me the generic ngk's don't come pregapped. :( i'm getting frustrated trying to get some damn pregapped plugs for this car

 

-Luke

 

Please don't take offense to this, but it's really not that hard to gap a plug. :)

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Please don't take offense to this, but it's really not that hard to gap a plug. :)

 

iridium plugs are diff bro.. geez

 

+1. you're actually NOT supposed to gap an iridium because the angle of the ground strap will never come out perfect and the iridium's are very sensitive, and the iridium tip is so fragile.

 

-Luke

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I did, he was the one who told me the generic ngk's don't come pregapped. :( i'm getting frustrated trying to get some damn pregapped plugs for this car

 

-Luke

 

See my post earlier - try sparkplugs.com.

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just got off the phone with NGK tech support. NGK plug stock number 6619 is NOT recommended for the LGT. it physically will fit but As we had mentioned before, 6619 is pregapped at .044 for the 2.5i and changing the gap on the plug more than .08 from where it is pregapped will severly alter the angle of the ground strap and has a better chance of prematurely wearing out the iridium tip. So if fredbeans sells you NGK stock number 6619 for your LGT pregapped at .044, tell them to take the plugs back because NGK tech does NOT recommend that plug for the car. that's what i'm about to do.

Unless you want to regap them yourself and risk it

 

-Luke

Edited by lkailburn
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+1. you're actually NOT supposed to gap an iridium because the angle of the ground strap will never come out perfect and the iridium's are very sensitive, and the iridium tip is so fragile.

 

-Luke

But it's just the center electrode that's iridium, not the ground electrode. You never touch the center electrode to gap a plug. The Denso website says you can do it. I hear what you guys are saying and I know you're being extra careful and all, but it is just a spark plug. <ducking to avoid the rotten tomatoes being thrown> :)

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But it's just the center electrode that's iridium, not the ground electrode. You never touch the center electrode to gap a plug. The Denso website says you can do it. I hear what you guys are saying and I know you're being extra careful and all, but it is just a spark plug. <ducking to avoid the rotten tomatoes being thrown> :)

 

haha yes just the tip is iridium and is indeed fragile. the ngk guy himself said it is ok to regap an iridium but they still follow the basic rule of thumb which is do not regap + or - more than .08 from it's pregapped location because the angle of the ground strap relative to the tip (whether it be iridium, plat, copper etc) will be incorrect.

 

i know there are members on here who have regapped a 6619 ngk plug for the lgt but i'll take the extra precaution and order the pregapped 7913 plugs. i'm shooting for optimal spark and longevity with this car :)

 

happy to share the info with the community,

 

-Luke

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