I checked the gap on my stock plugs yesterday and they were all .026"

 

Sounds reasonable, I've heard a few saying their gap was off. I'll be back there anyways installing an intake so I figure its an easy check.

 

The 24s are two ranges colder, right?

 

yes

 

So, this thread is huge and im having hard time finding the info im looking for. Im going to swap my stock plugs today for a set of Denso ITV22's. I have checked the gaps on the 4 new plugs and they read approximately .28-.29. What is the best gap i should go with? Also, when i pull my old ones is there anything in particular i should be looking for such as the gap on those or specific wear? Ive never done my own plugs nor have i done one so early in vehicle engine life. I have 12k miles and tuned stage 2.

Tappin on a phablet 4

 

Most are running the 22's @.028. They are looking at the stock plugs to see what they were gapped coming out of the factory. 028-032 is the range.

I run my 22'2 @ .028 and have had them in 5k miles. A lot less soot on the pipe, a little better mpg.

 

Most are running the 22's @.28. They are looking at the stock plugs to see what they were gapped coming out of the factory. 28-32 is the range. @ 12 k not gonna see much wear on plugs.

I run my 22'2 @ .28 and have had them in 5k miles. A lot less soot on the pipe, a little better mpg.

That what I wanted to know. Thanks.

Tappin on a phablet 4

 

I going to be installing ITV22's along with a Levels FMIC, Depo Racing catless DP, and the mods I already have listed in my sig. Would .28 gap work with all my mods?

 

Yup

 

Just being a stickler, but gap should be .028". I know many folks write it as .28, but I'd hate to see someone try to open them up to 1/4" gap and ruin the plug.

 

Disclaimer - I bought the car with 6,500 miles so I'm assuming the PO was stock tune.

I put 4,000 miles on and pulled the plugs for a total of 10,500 miles. They looked like this. To me this this looked a little lean (Too hot? Pre ignition?).

I used 87 octane on stock tune. Random gas. Not a care in the world. Ignorance was bliss.

 

At 10,500 miles I got a Panda custom tune for the 91 octane available in my area. I've put 9,000 miles on since the tune and pulled the plugs tonight. They look like this. Pretty good color. Still the stock plugs as shown in the previous post (LTR6DI-8).

With this tune I have been religious about using top tier 91 octane with some 93 octane mixed in when I could get it.

Looks like quality gas makes a difference in keeping the plugs from being too hot. I pulled this to see if I should be going one step colder. Now I'm not so sure I need to.

 

So what spark plug do I get for a stock car? I read the thread but people are even mentioning different part numbers for a stock plug. I'm confused.

 

LTR6DI-8

^^thats the stamp on the side of my stock plug. Stock plug with a stock tune and good gas will be fine.

 

"LTR6DI-8" is the NGK part number and I believe "CFYS12Y2" is the ford part number. The OEM plugs are NGK's

 

Was knocking on e30, was wondering what was wrong and found it was my NGK plugs not gapped correctly .034. Regapped them to .026-27 and the car seems so much better.

NGK measured at .034 logs

------------
Same tank of gas plugs gapped at .026-27 logs

 

Was knocking on e30, was wondering what was wrong and found it was my NGK plugs not gapped correctly .034. Regapped them to .026-27 and the car seems so much better.

Interesting to see better numbers for what I assume is cyl1-2, and now just 'OK' numbers for 3-4 where they were stronger before...

 

Has anyone been able to identify if any HKS Racing or NGK Racing plugs will fit the FOST?


Sent from my ST with love.

 

NGK definitely does. I run the LTR7IX-11

 

I'm wondering if anyone else has broken the plastic tabs that hold the wire connector to the coil? I'm usually not that big of an idiot but it took three broken clips before I realized they need pressed in not lifted up. Anyone know if these clips are easily replaced? Do you think I'll have problems with them working their way back off without the plastic clip to retain them? I currently just wrapped them with electrical tape to secure them, no problems thus far.

 

so are the factory plugs equivalents to the itv22s or naw? probably going to order the 24s tonight.

 

22s are one step colder and 24s are two steps colder.

Sent from another galaxy.

 

22s ordered, thanks walmart

 

Pulled my plugs today at 43,500 miles, replaced with ITV22's. They all look the same and look fine, however I noticed these little built-up circles under the ground electrode. Anyone know what this is/means? I think they show up in the one pic.

 

Any idea how often we should be replacing the ITV22s on a tuned car?

 

I pulled mine after 10,000 miles (on the plugs) to check gap and general condition. All good.

I run a mild (Steeda) tune and 93 or better gas.

 

Just pulled my #2 plug which is my cylinder that has the most knock. ITV22 on for 7k miles. Any thoughts?

 

Just pulled my #2 plug which is my cylinder that has the most knock. ITV22 on for 7k miles. Any thoughts? <img src="http://www.focusst.org/forum/attachment.php?attachmentid=93900"/><img src="http://www.focusst.org/forum/attachment.php?attachmentid=93901"/>

Yup looks normal

 

I'm running a BT and WMI and the ITV-22 only lasted 7500 miles. Checked them and had lost .003" already. This was my second set. Going with ITV-24 this time.

 

Thought I would share this so maybe it will help someone out. I pulled my denso's out to check and re gap them yesterday. All four plugs looked good but 2 of them has a black oily substance on the base of the plug and base of the threads, but the rest of the plug 3/4 of threads leading down to the electrode and electrode was dry and clean.

I was like wtf??? Gap the plugs and re install. Thought about it today and after discussing it with Hemicouple I figured it out....

If you spill oil when pouring it in the funnel and it runs all down the outside of the fill tube during an oil change .... Pretty sure the base of your 2 plugs closest to the fill tube will ... well you get the picture :smile:

 

Build date: 2014.5
Odo: 14645
Mods: fr tune, steeda fmic
Plugs: itv-24's

Plugs are 1-4 L-R

Plug two worries me a bit.

Can anyone offer some insight as to why #2 would have less of a "sooty" look around the edges and maybe some more peppering on the porcelain?

Datalogging via dash command and no issues detected and she runs like a top.

 

The plugs look fine to me.

Can't see the electrode in the provided pic. How was the gap when you checked them?

 

The plugs look fine to me. Can't see the electrode in the provided pic. How was the gap when you checked them?

Sorry I don't know why left that out, .028. The electrodes looked all the same and can really only be seen on plug 4 (barely). I didn't get a pic of the electrodes head on, doh!

I reset the KAM and went for a nice drive, things ran smoothly. Monitoring I didn't see any problems either. Compression is good through all 4.

 

About 6k total miles, set to .028 @ install.

 

Im very confused. I read the first few pages im not reading all of them. Would be nice if 1st post was updated with all info. Anyway im stage 3 stock turbo no intention of changing, cpe everything with fswerks cobb ap and frpp exhaust. Do I NEED to upgrade my plugs, or its not necessary? If i should what plugs do I use and what do I gap them to?

P.s. 2013 st with a oct 2012 build i believe if i remember correctly. 13k currently

 

Excellent article put together by Stratified that should answer all your questions.

Blog : Spark Plug Tech : Stratified Automotive Controls