Professional Iridium Spark Plug
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ACDelco Professional Iridium Spark Plug

Part No. 41-103 Warranty Details  

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ACDelco is a global leader in automotive replacement parts and related services and offers quality aftermarket products for most makes and models, including General Motors, Ford, Chrysler, Toyota and Honda, plus many original equipment service replacement parts. ACDelco products can be found in more than 100 countries located on six of the seven continents and are sourced globally to meet the needs of the local markets, including "maintenance" parts commonly replaced during the lifetime of a vehicle (e.g., batteries, oil filters, air filters, wiper blades, shocks and brakes), as well as "repair" parts (e.g., alternators, radiators, chassis and heating/cooling components). ACDelco offers more than 80,000 parts across 37 product lines.

ACDelco has over 100 years of experience in the automotive industry and is a brand of GM Customer Care and Aftersales, a division of General Motors. ACDelco employs a two- or three-tiered distribution model, utilizing a network of appointed wholesale distributors to service independent installers, ACDelco independent service centers, retail and fleet customers.

Product Features:

  • The kind of firepower you expect from ACDelco. The spark plug is what started it all for us, and with over 100 years of innovation behind each spark plug, you know they're going to be great. From the old to the new and even the non-automotive, ACDelco has a spark plug to fit just about whatever your need may be.
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Electrode Core Material:Copper
Electrode Tip Material:Iridium
Resistor:Yes
Spark Plug Seat Type:Tapered
Spark Plug Thread Size:14

REVIEW SNAPSHOT®

by PowerReviews
ACDelcoProfessional Iridium Spark Plug
 
4.7

(based on 32 reviews)

Ratings Distribution

  • 5 Stars

     

    (26)

  • 4 Stars

     

    (3)

  • 3 Stars

     

    (2)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (1)

97%

of respondents would recommend this to a friend.

Pros

  • Improves engine efficiency (27)
  • Increases power (26)
  • Easy to install (22)
  • Durable (19)
  • Lightweight (6)

Cons

No Cons

Best Uses

  • Everyday driving (28)
  • Replacement (24)
  • Performance driving (5)
    • Car & Truck:
    • Casual driver (3)
    • Reviewer Profile:
    • Casual driver (21), Auto enthusiast (10), Mechanic (4), Truck enthusiast (4)

Most Liked Positive Review

 

Great plugs!

I bought these plugs for my new to me 2002 Chevy Trailblazer. It ran good, but just didn't feel like it had as much power as it should have. Did my research, and...Read complete review

I bought these plugs for my new to me 2002 Chevy Trailblazer. It ran good, but just didn't feel like it had as much power as it should have. Did my research, and found that this SUV loves the AC Delco 41-103 plugs. Went out and pulled the plugs in it and found $2 AutoLite plugs in it. The next day I got the Delcos, popped them in, and my Trailblazer is running like a top. Be careful with these as they are Iridium plugs and can't be gapped in the traditional manner like your standard plugs can.

VS

Most Liked Negative Review

 

Fine tune up, ready for another 50K

My old AC Delco spark plugs showed some usage at 50,000 miles. Mechanic said they could have gone the full 100,000 miles. However, I felt a tune up at 50,000 with the AC...Read complete review

My old AC Delco spark plugs showed some usage at 50,000 miles. Mechanic said they could have gone the full 100,000 miles. However, I felt a tune up at 50,000 with the AC Delco spark plugs with Iridium would only improve my gas mileage and provide a better performaning vehicle. Tune up at 50,000 may have been overkill, but the ride is a smooth one.

Reviewed by 32 customers

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Displaying reviews 1-10

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(0 of 2 customers found this review helpful)

 
5.0

acdelco for chevy

By 

from n.j.

About Me Casual Driver

Ask me a question

Verified Buyer
3 or more reviews submitted

Pros

  • Durable
  • Easy To Install
  • Improves Engine Efficiency
  • Increases Power

Cons

    Best Uses

    • Everyday Driving

    Comments about ACDelco Professional Iridium Spark Plug:

    have 5 cars in driveway,all use ACDelco

    Comment on this review(earn points)

    (3 of 3 customers found this review helpful)

     
    5.0

    Great plugs!

    By 

    from Dandridge TN

    About Me Auto Enthusiast, Casual Driver

    Helpful Reviewer

    Pros

    • Durable
    • Easy To Install
    • Improves Engine Efficiency
    • Increases Power

    Cons

      Best Uses

      • Everyday Driving
      • Replacement

      Comments about ACDelco Professional Iridium Spark Plug:

      I bought these plugs for my new to me 2002 Chevy Trailblazer. It ran good, but just didn't feel like it had as much power as it should have. Did my research, and found that this SUV loves the AC Delco 41-103 plugs. Went out and pulled the plugs in it and found $2 AutoLite plugs in it. The next day I got the Delcos, popped them in, and my Trailblazer is running like a top. Be careful with these as they are Iridium plugs and can't be gapped in the traditional manner like your standard plugs can.

      Comment on this review(earn points)

      (0 of 3 customers found this review helpful)

       
      5.0

      works better then stock

      By 

      from Philadelphia, PA

      About Me Auto Enthusiast

      Ask me a question

      Verified Buyer
      Level 3

      Pros

      • Durable
      • Easy To Install
      • Improves Engine Efficiency
      • Increases Power

      Cons

        Best Uses

        • Everyday Driving
        • Performance Driving
        • Replacement

        Comments about ACDelco Professional Iridium Spark Plug:

        This was very east to do and while your there you should replace the spark plugs I used the stock Professional Iridium Spark Plug by ACDelco and since the best way to replace these is to take the 4 bolts out of the throttle body off you should take the time to clean that too.

        Comment on this review(earn points)

        (2 of 4 customers found this review helpful)

         
        5.0

        Good OE plugs

        By 

        from CT

        About Me Mechanic

        Verified Buyer
        Level 1

        Pros

        • Improves Engine Efficiency
        • Increases Power

        Cons

        • Decreases Gas Mileage

        Best Uses

        • Replacement

        Comments about ACDelco Professional Iridium Spark Plug:

        Great. Product. No need to go with over the top expensive plugs.

        Comment on this review(earn points)

         
        5.0

        I would buy this product again

        By 

        from Upper Sandusky, OH

        About Me Casual Driver

        Verified Buyer
        Level 2

        Pros

          Cons

            Best Uses

            • Replacement

            Comments about ACDelco Professional Iridium Spark Plug:

            .

            Comment on this review(earn points)

            (2 of 2 customers found this review helpful)

             
            5.0

            best of the best

            By 

            from north Florida

            About Me Auto Enthusiast, Mechanic, Truck Enthusiast

            Ask me a question

            Verified Buyer
            Level 3

            Pros

            • Improves Engine Efficiency
            • Increases Power

            Cons

              Best Uses

              • Everyday Driving
              • Performance Driving
              • Racing
              • Replacement

              Comments about ACDelco Professional Iridium Spark Plug:

              Have been using these iridium plugs ever since they first came out with them. And that's all I will ever use. They will go 100,000 miles but I change them at 30,000

              Comment on this review(earn points)

              (2 of 4 customers found this review helpful)

               
              5.0

              Excellent OEM plug...

              By 

              from Pflugerville, Texas

              About Me Auto Enthusiast, Casual Driver

              Verified Buyer
              3 or more reviews submitted

              Pros

              • Better Mpg And Performanc
              • Improves Engine Efficiency
              • Increases Power

              Cons

                Best Uses

                • Everyday Driving
                • Replacement

                Comments about ACDelco Professional Iridium Spark Plug:

                These plugs performed better than the Bosch I put in prior. They're used in a 2008 HHR LT2 and actually have helped with performance and MPG. Excellent plug and easy to replace.

                Comment on this review(earn points)

                (4 of 10 customers found this review helpful)

                 
                1.0

                Where is the quality control ?

                By 

                from Kankakee, Il

                About Me Casual Driver

                Verified Buyer
                Level 2

                Pros

                • Easy To Install

                Cons

                  Best Uses

                  • Everyday Driving

                  Comments about ACDelco Professional Iridium Spark Plug:

                  Had no problem installing plugs. Started engine and it was idling rough. Took a road trip and engine light came on and started flashing. Owner's manual showed that as "mis-fire". Called dealership and they said "Do not drive it, it will damage engine!" Had to call a mechanic to check it out and found that the #6 plug was bad.(of course it had to be the hardest one to get to.) The upper part of the plug was bent. Put one of the old plugs in and it works fine. Now I have to make a 20 mile round trip to get another plug, take things apart for the third time and put the new plug in.I guess things do happen but I am not happy with the extra expense.

                  Comment on this review(earn points)

                  (2 of 4 customers found this review helpful)

                   
                  5.0

                  power restored

                  By 

                  from Rochester,ny

                  About Me Casual Driver

                  Verified Buyer
                  Level 1

                  Pros

                  • Durable
                  • Easy To Install
                  • Improves Engine Efficiency
                  • Increases Power

                  Cons

                    Best Uses

                    • Everyday Driving
                    • Performance Driving
                    • Replacement

                    Comments about ACDelco Professional Iridium Spark Plug:

                    Perfect ForTheJob

                    Comment on this review(earn points)

                    (2 of 5 customers found this review helpful)

                     
                    5.0

                    Nice plugs

                    By 

                    from Ky

                    About Me Casual Driver

                    Verified Buyer
                    Level 1

                    Pros

                    • Durable
                    • Easy To Install
                    • Improves Engine Efficiency
                    • Increases Power

                    Cons

                      Best Uses

                      • Everyday Driving
                      • Replacement

                      Comments about ACDelco Professional Iridium Spark Plug:

                      Great product

                      Comment on this review(earn points)

                      Displaying reviews 1-10

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                      Do you have questions about this product?(earn points for answers!)

                       

                      Ask a question, get answers from real customers and in-house experts. Or contact Customer Care by email or call 1-877-238-2623.

                      5 Questions | 6 Answers
                      Displaying questions 1-5
                      • Q:

                        I am buying the AC Delco 41-103 sparkplugs. What size socket do I need?

                        Thanks, Glenn
                        Asked on 1/8/2013 by Glenn from Snow Hill , N.C.

                        1 answer

                        • CUSTOMER CARE

                          A:

                          A 5/8 inch spark plug socket should work on this ACDelco Spark Plug part# 41-103 as the hex size of this spark plug is 16mm. For any further assistance, you may also visit your nearest Advance Auto store or call us directly at 1-877-ADVANCE (238-2623) and one of our representatives there would be more than happy to assist you.

                          Answered on 1/9/2013 by Vincent from AAP
                      • Q:

                        Does the 5/8 inch spark plug socket fit this particular plug? Thanks!
                        Asked on 11/30/2012 by Ken from Miami, FL

                        1 answer

                        • CUSTOMER CARE

                          A:

                          Yes, a 5/8 inch spark plug socket should work on this ACDelco Spark Plug part# 41-103 as the hex size of this spark plug is 16mm. For any further assistance, you may also visit your nearest Advance Auto store or call us directly at 1-877-ADVANCE (238-2623) and one of our representatives there would be more than happy to assist you.

                          Answered on 11/30/2012 by Rick from AAP
                      • Q:

                        my book says gap.042 & you guys say .043, cant find any ac/Delco .042. the book & you guys say be exact & i am!
                        Asked on 6/10/2011 by craig from rocky riveer

                        1 answer

                        • CUSTOMER CARE

                          A:

                          These plugs come with the gap already set as 0.043.

                          Answered on 6/21/2011 by Vincent from AAP
                      • Q:

                        Do these have Iridium?
                        Asked on 6/6/2011 by jeff from Chesterfield, Va

                        1 answer

                        • CUSTOMER CARE

                          A:

                          The material of the electrode tip is made out of iridium.

                          Answered on 6/7/2011 by DIY Daniel from AAP
                      • Q:

                        Do these spark plugs need to be gapped or do they already come pre gapped?
                        Asked on 1/9/2011 by Erol from Cocoa Beach, FL

                        2 answers

                        • A:

                          pre gapped at factory settings.if not your gap setting,you must gap for the setting for your car.

                          Answered on 8/4/2012 by johnd93 from hull ga
                        • CUSTOMER CARE

                          A:

                          The majority of the time, spark plugs come pre-gapped.

                          Answered on 1/11/2011 by Mike the Auto Parts Master from AAP
                      Displaying questions 1-5

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