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Thread: 2014 Touring FWD - Spark Plug Model Number?

  1. #16
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    If you think about it, take a photo of those used plugs and share with us. They should be in very good shape.

  2. #17
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    Thx yrwei52!

    Off to Amazon...

  3. #18
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    Will do.

  4. #19
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    Spark plug replacement

    I went ahead and replaced them on our 2014 Grand Touring AWD after almost 5 years and 60k miles. I know the manual says 75k miles but I figure it was time given the high compression ratio SkyActiv engines and the lots of stop and go seen by this car (my spouse's hour long city commute).

    I got the Mazda OEM plugs (PE5R-18-110) despite their high cost, given the experience of others on this forum. $25.82 each! https://www.shopmazdaparts.com/oem-p...plug-pe5r18110

    You'll definitely need a 9/16" spark plug socket - the one size I did not have. I got a nice magnetic one with a swivel joint (GearWrench 3938) but it was too shallow for the Mazda plugs; I tapped in the magnet a bit and made it work (see my comment on Amazon). The plugs are pretty deep in the engine block so make sure you also have an extension for your wrench.

    Very straightforward job: remove the cover, remove the bolts holding the ignition coils, unplug connector for each coil, and remove and replace plugs. Here is a pic of the old plugs. The electrodes looked in good condition with only some carbon on them. I expected some oil on the threads (no big deal) but the ceramic insulators had a bit too much crud (oil?). You can see where the rubber boot of the ignition coil fits on the ceramic insulator:



    After seeing them I'm glad I replaced them.

  5. #20
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    2014 CX-5 Touring AWD

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    Well I'm at 67k miles on my 2014. Guess I should go ahead and replace mine too.
    2014 CX-5 Touring AWD | Jet Black Mica - 74k miles
    01/2013 build | 4/20/2013 buy

  6. #21
    Registered Member yrwei52's Avatar
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    Arrow 2014 Touring FWD - Spark Plug Model Number?

    Quote Originally Posted by regtor View Post
    I went ahead and replaced them on our 2014 Grand Touring AWD after almost 5 years and 60k miles. I know the manual says 75k miles but I figure it was time given the high compression ratio SkyActiv engines and the lots of stop and go seen by this car (my spouse's hour long city commute).

    I got the Mazda OEM plugs (PE5R-18-110) despite their high cost, given the experience of others on this forum. $25.82 each! https://www.shopmazdaparts.com/oem-p...plug-pe5r18110

    You'll definitely need a 9/16" spark plug socket - the one size I did not have. I got a nice magnetic one with a swivel joint (GearWrench 3938) but it was too shallow for the Mazda plugs; I tapped in the magnet a bit and made it work (see my comment on Amazon). The plugs are pretty deep in the engine block so make sure you also have an extension for your wrench.

    Very straightforward job: remove the cover, remove the bolts holding the ignition coils, unplug connector for each coil, and remove and replace plugs. Here is a pic of the old plugs. The electrodes looked in good condition with only some carbon on them. I expected some oil on the threads (no big deal) but the ceramic insulators had a bit too much crud (oil?). You can see where the rubber boot of the ignition coil fits on the ceramic insulator:



    After seeing them I'm glad I replaced them.
    Thanks for your report. Looks like your factory spark plugs are different form the ones you got - PE5R-18-110 (resistor type), rathef the PE5S-18-110?

    BTW I can't find your comment at Amazon for GearWrench 3938D 3/8" Drive 6" Magnetic Swivel Spark Plug Socket 9/16", Black. My old Craftsman tool set has only 13/16" and 5/8" spark plug socket with rubber insert. I need a good 14mm (actually I believe 14mm instead of 9/16" is the correct size) spark plug deep socket for my CX-5.

  7. #22
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    Quote Originally Posted by yrwei52 View Post
    Thanks for your report. Looks like your factory spark plugs are different form the ones you got - PE5R-18-110 (resistor type), rathef the PE5S-18-110?
    Yes, noticed that as well. I think the "S" part number has been replaced with the "R" but cannot confirm. In any case, the "R" part number is what comes up after several searches in various Mazda dealer parts websites.

    Quote Originally Posted by yrwei52 View Post
    BTW I can't find your comment at Amazon for GearWrench 3938D 3/8" Drive 6" Magnetic Swivel Spark Plug Socket 9/16", Black. My old Craftsman tool set has only 13/16" and 5/8" spark plug socket with rubber insert. I need a good 14mm (actually I believe 14mm instead of 9/16" is the correct size) spark plug deep socket for my CX-5.
    Hmmm, maybe it's taking some time to post. I commented on a review left by "Ryan" regarding tapping down the magnet inside the socket, it should be the first review shown. Yes the correct size is 14mm but 9/16" is virtually the same (ok, 14.29mm) and I wanted magnetic with swivel. I got the 5/8" spark plug size version of this GearWrench socket several years ago and it has held up very well (used a couple of times for two other cars).
    Last edited by regtor; 06-23-2018 at 06:03 PM.

  8. #23
    Registered Member yrwei52's Avatar
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    Arrow 2014 Touring FWD - Spark Plug Model Number?

    Quote Originally Posted by regtor View Post
    Yes, noticed that as well. I think the "S" part number has been replaced with the "R" but cannot confirm. In any case, the "S" part number is what comes up after several searches in various Mazda dealer parts websites.
    I believe PE5R-18-110 and PE5S-18-110 are basically the same spark plug. Usually "S" is standard plug but "R" is resister type plug which will help reducing the spark noise to radio reception.

    Hmmm, maybe it's taking some time to post. I commented on a review left by "Ryan" regarding tapping down the magnet inside the socket, it should be the first review shown. Yes the correct size is 14mm but 9/16" is virtually the same (ok, 14.29mm) and I wanted magnetic with swivel. I got the 5/8" spark plug size version of this GearWrench socket several years ago and it has held up very well (used a couple of times for two other cars).
    I believe Amazon will review each comment then post it within a day or two. I did a search and there're plenty of metric 14mm thin-wall spark plug deep sockets available, even at Lowe's and Home Depot for $10! I'll try to pick one up with good reviews.

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