Iridium Ix Spark Plug (ZFR5FIX-11)
Hover over the image to zoom in
Share this:

NGK Iridium Ix Spark Plug (ZFR5FIX-11)

Part No. 2477 Warranty Details  

See if this part fits a specific vehicle.

Check Vehicle Fit

Laser-welded iridium center electrode is resistant to heat, corrosion and electrical wear. The tapered ground electrode minimizes quenching. Provides outstanding acceleration, high fuel efficiency and durability.

Product Features:
  • 0.6 mm iridium-tip center electrode provides durability and a high melting point
  • Taper-cut ground electrode shape provides improved flame reproduction
Back To Top
Center Electrode Core Material:Copper Core
Center Electrode Tip Material:Iridium
Electrode Core Material:Iridium
Electrode Tip Material:Iridium
Gap Size:0.044 in
Ground Configuration:Standard
Ground Electrode Core Material:Nickel Core
Ground Electrode Quantity:1
Ground Electrode Tip Design:Taper Cut
Ground Strap Quantity:1
Hex Size:5/8
Manufacturer Heat Range:5
Reach:19 mm
Resistor:Yes
Seat Type:Gasket
Shorty Spark Plug:No
Thread Diameter:14 mm
Tip Configuration:Solid
Type:Iridium IX
Wrench Diameter:5/8 in

REVIEW SNAPSHOT®

by PowerReviews
NGKIridium Ix Spark Plug (ZFR5FIX-11)
 
4.8

(based on 41 reviews)

Ratings Distribution

  • 5 Stars

     

    (35)

  • 4 Stars

     

    (5)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (1)

98%

of respondents would recommend this to a friend.

Pros

  • Improves engine efficiency (31)
  • Easy to install (27)
  • Increases power (26)
  • Durable (18)
  • Lightweight (7)

Cons

No Cons

Best Uses

  • Everyday driving (28)
  • Replacement (20)
  • Performance driving (14)
  • Restoration (5)
  • Racing (3)
    • Car & Truck:
    • Casual driver (5), Auto enthusiast (3)
    • Was this a gift?:
    • No (4)
    • Reviewer Profile:
    • Casual driver (21), Auto enthusiast (11), Mechanic (5), Competitive driver (3), Truck enthusiast (3)

Most Liked Positive Review

 

NGK Spark Plugs

I respect and enjoy the NGK product line. So being able to easily go to a convenient auto parts supplier and pick up is very comforting.

I respect and enjoy the NGK product line. So being able to easily go to a convenient auto parts supplier and pick up is very comforting.

VS

Most Liked Negative Review

 

the worst gas mileage

I have had these plugs in for only two days and my gas mileage has dropped from 19.2 miles to 16.2 miles. This is a car that I use for work that is stop...Read complete review

I have had these plugs in for only two days and my gas mileage has dropped from 19.2 miles to 16.2 miles. This is a car that I use for work that is stop and go. Now on the upside its looking like highway mileage has gone up a little but only time will tell.

Reviewed by 41 customers

Displaying reviews 1-10

Back to top

Previous | Next »

 
4.0

Great product. Will definitely use again.

By 

from Clover

Verified Buyer

Comments about NGK Iridium Ix Spark Plug (ZFR5FIX-11):

Already pre gaped. Fires strong.

  • Was this a gift?:
  • No
 
1.0

the worst gas mileage

By 

from macon, ga

Verified Buyer

Comments about NGK Iridium Ix Spark Plug (ZFR5FIX-11):

I have had these plugs in for only two days and my gas mileage has dropped from 19.2 miles to 16.2 miles. This is a car that I use for work that is stop and go. Now on the upside its looking like highway mileage has gone up a little but only time will tell.

  • Was this a gift?:
  • No
 
5.0

Spark plugs awesome

By 

from Stout, IA

Verified Buyer

Comments about NGK Iridium Ix Spark Plug (ZFR5FIX-11):

Iridium plugs work great and last a long time. Good price and ready when I got to the store. Would definitely buy again

  • Was this a gift?:
  • No
 
5.0

The best plugs increase hp and great on saving fuel.

By 

from Clermont

Comments about NGK Iridium Ix Spark Plug (ZFR5FIX-11):

Simply the best you will not regret buying Iridium Sparks plugs.

  • Was this a gift?:
  • No
 
5.0

Better than origional

By 

from Northern VA

About Me Auto Enthusiast, Casual Driver, Truck Enthusiast

See all my reviews

Verified Buyer

Pros

  • Already Gapped Correctly
  • Easy To Install
  • Improves Engine Efficiency

Cons

    Best Uses

    • Everyday Driving
    • Replacement

    Comments about NGK Iridium Ix Spark Plug (ZFR5FIX-11):

    Being gapped per spec is a time saver.

     
    5.0

    Great plugs and great price !

    By 

    from Cottondale, Al.

    About Me Casual Driver

    Verified Buyer

    Pros

    • Easy To Install
    • Improves Engine Efficiency
    • Increases Power
    • Pre Gapped

    Cons

      Best Uses

      • Everyday Driving

      Comments about NGK Iridium Ix Spark Plug (ZFR5FIX-11):

      Easy installation in my 2013 Dodge Journey 2.4L 4 cyl. Took about 15 minutes. Got a 20% discount online at Advance.

       
      5.0

      Great quality!

      By 

      from Cincinnati, OH

      About Me Casual Driver

      Verified Buyer

      Pros

      • Durable
      • Improves Engine Efficiency
      • Increases Power

      Cons

      • None

      Best Uses

        Comments about NGK Iridium Ix Spark Plug (ZFR5FIX-11):

        This is the second time I've replaced my plugs with the NGK Iridium. The ones I just took out still looked good - just a little bit of white, very little carbon buildup. I expect these to last another hundred thousand miles like the other ones did!

         
        5.0

        Perfectly Pre gapped

        By 

        from Rochester NY

        Verified Buyer

        Comments about NGK Iridium Ix Spark Plug (ZFR5FIX-11):

        I was happy to find all 6 of the plugs were perfectly pre gapped!!!

         
        5.0

        Great

        By 

        from Bel Air md

        Verified Buyer

        Comments about NGK Iridium Ix Spark Plug (ZFR5FIX-11):

        Great

         
        5.0

        good price

        By 

        from castle rock co

        About Me Auto Enthusiast

        Verified Buyer

        Pros

        • Improves Engine Efficiency

        Cons

          Best Uses

          • Performance Driving

          Comments about NGK Iridium Ix Spark Plug (ZFR5FIX-11):

          good price when ordered online with the easy to find discount coupon.

          Displaying reviews 1-10

          Back to top

          Previous | Next »

          Do you have questions about this product?

           

          Ask a question, get answers from real customers and in-house experts. For further assistance, please review your support options on our Contact Us page.

          8 Questions | 9 Answers
          Displaying questions 1-8
          • Q:

            The listing shows a gap of .032" but NGK website shows .044" for this plug. The .044" spec would be correct for a '99 Mazda 626 2.0L 4cyl but my '99 Mazda 626 2.5L 6cyl requires a .031" gap per owners manual and Mazda Factory Service Manual. Can someone verify the actual gap on these? NGK says they should not be adjusted more than .008" which would only get me to .036".
            Asked on 10/15/2016 by RachelAnne from Florida

            1 answer

            • CUSTOMER CARE

              A:

              Yes, RachelAnne, NGK Iridium Ix Spark Plug (ZFR5FIX-11) (Part No. 2477) is pre-gaped as .044" (1.1mm). All the spark plugs are pre-gapped from the factory, the fact remains that the gap must be adjusted for the vehicle that the spark plug is intended for. Those with modified engines must remember that a modified engine with higher compression or forced induction will typically require a smaller gap settings.

              Answered on 10/17/2016 by Steve from AAP
          • Q:

            Are these pre gapped?
            Asked on 6/26/2014 by Jay from Bronx, NY

            1 answer

            • CUSTOMER CARE

              A:

              Hi Jay, glad to assist you! All the spark plugs are pre-gapped from the factory, the fact remains that the gap must be adjusted for the vehicle that the spark plug is intended for. Those with modified engines must remember that a modified engine with higher compression or forced induction will typically require a smaller gap settings.

              Answered on 6/27/2014 by Vincent from AAP
          • Q:

            Do I needed to install specified ignition cables for these spark plugs for my 95 Honda Civic?
            Asked on 11/29/2013 by C-Chan from Vancouver BC

            1 answer

            • CUSTOMER CARE

              A:

              Hi C-Chan, glad to assist you! This iridium spark plug should work fine with the O.E specified spark plug wires on your 1995 Honda Civic.

              Answered on 11/30/2013 by Vincent from AAP
          • Q:

            hi,

            if my car manual calls for 1.1 mm gap do i have to gap the spark plugs to 1.1 mm or keep it 0.6 mm

            thank you
            Asked on 11/10/2013 by AMAQ03 from Jordan

            1 answer

            • CUSTOMER CARE

              A:

              Hi AMAQ03, good question! You may need to re-gap the spark plug. A spark plug part number might fit hundreds of different engines from many different manufacturers. Although the NGK factory will set the gap to a pre-selected setting, this may not be the right gap for your particular engine. The incorrect plug gap for your engine can contribute to a high rate of misfires, loss of power, plug fouling, poor fuel economy, and accelerated plug wear. It is always best to check the gap against the manufacturer's specifications.

              Answered on 11/10/2013 by Vincent from AAP
          • Q:

            What is the mileage range for this product?
            Asked on 9/23/2013 by jomo

            2 answers

            • CUSTOMER CARE

              A:

              Hello with reference to your question, NGK Iridium Ix Spark Plug (ZFR5FIX-11) - Part No. 2477, it gives a life expectancy of 40-50k miles. But they have to temper their projections as driving conditions and motor modifications differ. You can expect 60,000 to 80,000 miles and about 1-2% of total engine output, on an unaltered motor. For any further assistance, please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto Parts store and one of our Parts Pros will gladly assist you with any questions or concerns you may have.

              Answered on 9/23/2013 by Max from AAP
            • CUSTOMER CARE

              A:

              With reference to your question, NGK Iridium Ix Spark Plug (ZFR5FIX-11) - Part No. 2477, it gives a life expectancy of 40-50k miles. But they have to temper their projections as driving conditions and motor modifications differ. You can expect 60,000 to 80,000 miles and about 1-2% of total engine output, on an unaltered motor. For any further assistance, please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto Parts store and one of our Parts Pros will gladly assist you with any questions or concerns you may have.

              Answered on 9/23/2013 by Max from AAP
          • Q:

            Besides the warranty, is there really a difference between a $7 spark plug and a $2 spark plug?
            Asked on 11/4/2010 by Anonymous

            1 answer

            • CUSTOMER CARE

              A:

              performance, how long it will last, how much it sparks.

              Answered on 11/4/2010 by Anonymous
          • Q:

            Is this for one spark plug or a set of 4?
            Asked on 10/14/2010 by Anonymous

            1 answer

            • CUSTOMER CARE

              A:

              Just one.

              Answered on 10/14/2010 by Mike the master of auto parts from AAP
          • Q:

            What does the heat range number mean?
            Asked on 4/24/2010 by Anonymous

            1 answer

            • CUSTOMER CARE

              A:

              The heat range is the temperature at the tip of the spark plug within the running engine.

              Answered on 5/3/2010 by Mike from AAP
          Displaying questions 1-8

          Do you have a question about this product? 

          Check out the specials in our monthly flyer.
           
           
          Disclaimer We strive to keep all information accurate and up-to-date; however, product availability, pricing, promotions and store hours are subject to change without notice. Please contact Customer Care if you have any questions or corrections.