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Discussion Starter · #1 ·
I've seen the you tube and links from here, but is a '14 change the same as earlier years sans iridium plugs? Any good advice?
 

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Subaru switched to coil-on-plug ignition for the non-turbo FB25 engine when it was introduced in the MY2011 Forester (US market). The recommended plug for the MY2011 through MY2014 FB25 is the NGK SILZKAR7B11; check the Specifications section in the OM for any of these model years.

If you're looking for a "how to", look for one based on this engine and time frame, as changing each plug means removing/replacing its coil and associated hardware. "How to's" for the MY2010 and older non-turbo EJ25 engine don't exactly apply.

Hope this helps,
Jim / crewzer

P.S. I just have to ask: Why are you researching this topic?
 

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Discussion Starter · #3 ·
Thanks for your suggestions. I'll keep looking for the how to article.
 

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The front plug on the passenger side looks like it might be very difficult to get out. With the 14's I guess we have plenty of time to figure it out. Anyone know why Subaru recommends replacing plugs at 60K miles when everyone else is at 100k?
 

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The front plug on the passenger side looks like it might be very difficult to get out. With the 14's I guess we have plenty of time to figure it out. Anyone know why Subaru recommends replacing plugs at 60K miles when everyone else is at 100k?
I don't know if the FB has a "Wasted Spark" (Fires every 360 degrees). That might be a reason. Other possible reason is to get folks back to the dealer. I personally would change plugs at that mileage anyway. But then again...I was raised on the copper plugs. :icon_eek:

It has been discussed as I recall. Always with idle speculation (like mine)
 

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I don't know if the FB has a "Wasted Spark" (Fires every 360 degrees).
The FB25 is a "coil-on-plug" engine with a separate coil for each plug. Each plug fires once every 720 degrees.

I suspect this coil-on-plug configuration is directly related to the 60K plug change interval for the EJ25 turbo and the FB25 engines. The "old" non-turbo EJ25 engine's "wasted spark" configuration delivered a 30K mile plug change interval.

HTH,
Jim / crewzer
 

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Discussion Starter · #7 ·
Did the job. Not too bad, about two hours of leisurely work. Old plugs looked as good as the new ones, maybe the electrode was a bit more rounded than new, but looked like a waste of money.
 

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Thanks for the update.

Can I ask you what led you to change the plugs on your 2014 Forester?

Thanks,
Jim / crewzer
 

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The FB25 is a "coil-on-plug" engine with a separate coil for each plug. Each plug fires once every 720 degrees.

I suspect this coil-on-plug configuration is directly related to the 60K plug change interval for the EJ25 turbo and the FB25 engines. The "old" non-turbo EJ25 engine's "wasted spark" configuration delivered a 30K mile plug change interval.

HTH,
Jim / crewzer
Yea I actually thought that might be the case but I didn't want to put out more bs. :biggrin:
 

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Discussion Starter · #12 ·
Where are you getting your information on when servicing needs done?

This along with the fuel filter thread. Want to make sure you are not wasting money...

Here is a good, easy to read, chart showing the maintenance intervals for each item. 2014 Subaru maintenance schedule and new car break-in period

Thanks for your concern, but I've got the miles and the info comes from maintenance schedule found in the owner's manual.
 

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Did the job. Not too bad, about two hours of leisurely work. Old plugs looked as good as the new ones, maybe the electrode was a bit more rounded than new, but looked like a waste of money.
How was it getting the front passenger side plug out? At first glace it looks really tight to get to.
 

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It's been a long time since I did Subaru plugs, but IIRC, they were much easier to get to from underneath. The aero package on the '14 may make that a bigger pain than it used to be.
 

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Discussion Starter · #15 ·
How was it getting the front passenger side plug out? At first glace it looks really tight to get to.
I removed the air filter case and etc. on the pass side and the battery and etc. on driver's side. The purchase of a multi-jointed 3/8" drive socket wrench from our friends at Harbor Freight really made the job livable.
 

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Discussion Starter · #16 ·
It's been a long time since I did Subaru plugs, but IIRC, they were much easier to get to from underneath. The aero package on the '14 may make that a bigger pain than it used to be.
Top down was really not as bad as I expected. FYI, the "skid" pan is held on with a few easy to get at screws. I know, because I dropped the socket and had to go after it. Subaru was kind enough to include snap open mini-hatches in the pan, but too small to get the socket. But overall I will agree with those who recommend going through the hood to remove the plugs. As a matter of fact, I'm not sure it can be done any other way.
 
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