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This is a discussion on gaping iridium plugs??? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Originally Posted by brfatal Iridiums come pre-gapped according to the model number your order, so if you got the right ...

  1. #16
    Registered User JUSTINSNUTSWINGER's Avatar
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    Quote Originally Posted by brfatal View Post
    Iridiums come pre-gapped according to the model number your order, so if you got the right part, they should be ok out of the box. Attempting it will potentially ruin them.
    I just replaced mine last week with Denso NSC's and 1 was .026 and the others were ok at .027 (not that it WILL make a difference, but could)

    Just sayin
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  3. #17
    Registered User drew_ladue's Avatar
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    Omg !

    the effing dealer gave me the wrong plugs!the ones he gave me were for an EJ255 motor(which the label plate in my engine compartment says). those ones were shorter than the ones i pulled out. so i went back and he looked it up again.he went to the back and came back with EJ257 spark plugs. and WAALAA! the same size. but i dont have an STI. i have a 2006 wrx TR. do all wrx's and STI's use the same length spark plug?buuuut...bottem line is my car runs like a champ now...phewww! thanks everyone !

  4. #18
    He simply abides. SD_GR's Avatar
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    I'd rather be given the wrong plug that's shorter than the wrong plug that's longer any day. You were unlucky overall but lucky enough to have it sorted now, so all's well that ends well -- but I hope they apologized because it's not impossible to replace plugs, but it's certainly also not trivial.
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    Registered User drew_ladue's Avatar
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    soooo....dooooo all newer wrx's use ej257 spark plugs???do standard impreza's have an ej255 engine? cause if they do that would explain a lot. i have spark plugs in my 2006 wrx TR that are also used in sti's......normal? now that i've changed my plugs do i need to tune my car? if so.....how?

  6. #20
    Registered User JUSTINSNUTSWINGER's Avatar
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    No, no tune is needed.
    N-swinger

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  7. #21
    Registered User sniperwrx's Avatar
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    Quote Originally Posted by LPPTundWRX View Post
    well you disconnected your battery so the idle & air/fuel ratio had to relearn.. If you have a catless exhaust systems 06+ have had issues running catless. It may be the problem..

    The other issue may be... Do you have any CEL? I would suggest going out turning off all electrical items...

    Disconnect positive cable for 5 minutes

    Reconnect battery cable.

    Start car and let idle (no electrical items on, do not touch the throttle) for 10 minutes.

    Go drive, see if that helped.
    hi i have a 2002 wrx, i just changed the plugs and the car sort of jerks as you get to 4000rpm and then clears after a while, i fitted ngk pfr6g-11, have i maybe got the wrong plugs? the agent said its the rite ones. pls help

  8. #22
    Registered User drew_ladue's Avatar
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    are they gaped right? comapre the length of the plug you pulled out to the plug youre putin in and make sure they are the same length.thats what my problem was.

  9. #23
    Registered User mudferret's Avatar
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    Quote Originally Posted by sniperwrx View Post
    hi i have a 2002 wrx, i just changed the plugs and the car sort of jerks as you get to 4000rpm and then clears after a while, i fitted ngk pfr6g-11, have i maybe got the wrong plugs? the agent said its the rite ones. pls help
    Those don't appear to be gapped correctly for your application.


    PFR6G-11 indicated as 0.044" while the WRX requires 0.028 to 0.031".
    Last edited by mudferret; 03-30-2010 at 06:46 AM. Reason: 5p3lling
    ...Rob.
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  10. #24
    Registered User Pavia's Avatar
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    Quote Originally Posted by drew_ladue View Post
    soooo....dooooo all newer wrx's use ej257 spark plugs???do standard impreza's have an ej255 engine? cause if they do that would explain a lot. i have spark plugs in my 2006 wrx TR that are also used in sti's......normal? now that i've changed my plugs do i need to tune my car? if so.....how?
    Your car absolutely has an EJ255 engine, like all WRX of that year (as opposed to the EJ257 in the STI).

    Also, the EJ255 and EJ257 engines use the same sparkplug (NGK:ILFR6B, Iridium) and are gapped the same (0.028 - 0.031)...for 2006 anyway.

    If the dealership gave you the wrong plugs, it was something else (like the nonturbo engine), or gapped wrong, or maybe the first ones were loose (as you stated earlier)
    Last edited by Pavia; 03-30-2010 at 01:42 PM.
    06 GTO M6 Quicksilver, SLP 455 Bobcat, LS7 Clutch w/ SS line (RPM tune:373rwhp/373rwtq)
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  11. #25
    Registered User Pavia's Avatar
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    Quote Originally Posted by sniperwrx View Post
    hi i have a 2002 wrx, i just changed the plugs and the car sort of jerks as you get to 4000rpm and then clears after a while, i fitted ngk pfr6g-11, have i maybe got the wrong plugs? the agent said its the rite ones. pls help
    The part number you mentioned (PFR6G-11, Platinum, 0.044 gap) didn't come up with your application (Subaru 2002 WRX) on the site Mudferret listed.

    However, PFR6G (without the -11) came up for the 2002 WRX, with a 0.030 gap. This is a platinum plug. The Iriduim alternative is listed as BKR6EIX, with the same 0.030 gap.

    Either way, they probably gave you the wrong plugs...
    Last edited by Pavia; 03-30-2010 at 02:02 PM.
    06 GTO M6 Quicksilver, SLP 455 Bobcat, LS7 Clutch w/ SS line (RPM tune:373rwhp/373rwtq)
    07 WRX TR M5 Garnet Red Pearl w/ Straight PPGs and Cusco front LSD (Agile tune:307whp/343wtq)

  12. #26
    Registered User drew_ladue's Avatar
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    Quote Originally Posted by pavia View Post
    your car absolutely has an ej255 engine, like all wrx of that year (as opposed to the ej257 in the sti).

    Also, the ej255 and ej257 engines use the same sparkplug (ngk:ilfr6b, iridium) and are gapped the same (0.028 - 0.031)...for 2006 anyway.

    If the dealership gave you the wrong plugs, it was something else (like the nonturbo engine), or gapped wrong, or maybe the first ones were loose (as you stated earlier)
    thats false man. When i got the first set of plugs they looked it up in their computer as an ej255 turbo dohc. When i found out those ones were too small i went back and they went and got the longer plugs. They looked the longer plugs up in the computer and those ones are for an ej257. Im runnin plugs that are for an ej257 in my 2006 wrx tr.

  13. #27
    Registered User Pavia's Avatar
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    Quote Originally Posted by drew_ladue View Post
    thats false man. When i got the first set of plugs they looked it up in their computer as an ej255 turbo dohc. When i found out those ones were too small i went back and they went and got the longer plugs. They looked the longer plugs up in the computer and those ones are for an ej257. Im runnin plugs that are for an ej257 in my 2006 wrx tr.
    Your being sold a bill of goods, because I'm looking at the 2006 Subaru Service Manual right now and they are the same part number.

    Here's the specification for the WRX Engine (EJ255):

    Attachment 87958

    Here's the specification for the STI Engine (EJ257):

    Attachment 87959

    If you still don't believe me, check for yourself and tell me if the ILFR6B plug isn't used for both applications:

    NGK.com - Vehicle Fitting Results

    Parts clerks have been known to look up the wrong part. I just went to the local Subaru dealership this week to pick up some brake pad shims and they too had ordered the wrong parts.

    There's no way they gave you plugs for a EJ255 the first time, if they were physically different. Didn't the dealer use your VIN to look up the right plug?
    Last edited by Pavia; 04-03-2010 at 04:36 PM.
    06 GTO M6 Quicksilver, SLP 455 Bobcat, LS7 Clutch w/ SS line (RPM tune:373rwhp/373rwtq)
    07 WRX TR M5 Garnet Red Pearl w/ Straight PPGs and Cusco front LSD (Agile tune:307whp/343wtq)

  14. #28
    Good news, everyone! xxxxxxxAnub1s's Avatar
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    And this is why I purchase my own **** online instead of dealing with idiots at a part counter.

    Do yourself a favor next time, ask us what the part number is and we'll hook you up with the one you need. Don't rely on those monkey's at the parts counters unless you have one you trust. The person you dealt with was an idiot.

    Pavia has done you a real favor by providing the part number, which is exactly what you should be using.
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  15. #29
    Registered User drew_ladue's Avatar
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    thanks guys

  16. #30
    Registered User Pavia's Avatar
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    No problem.
    06 GTO M6 Quicksilver, SLP 455 Bobcat, LS7 Clutch w/ SS line (RPM tune:373rwhp/373rwtq)
    07 WRX TR M5 Garnet Red Pearl w/ Straight PPGs and Cusco front LSD (Agile tune:307whp/343wtq)

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