Professional Iridium Spark Plug
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ACDelco Professional Iridium Spark Plug

Part No. 41-993 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
Resistor:Yes
Spark Plug Seat Type:Tapered
Spark Plug Thread Size:14

REVIEW SNAPSHOT®

by PowerReviews
ACDelcoProfessional Iridium Spark Plug
 
4.7

(based on 34 reviews)

Ratings Distribution

  • 5 Stars

     

    (28)

  • 4 Stars

     

    (4)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (0)

97%

of respondents would recommend this to a friend.

Pros

  • Improves engine efficiency (24)
  • Increases power (23)
  • Easy to install (22)
  • Durable (19)
  • Lightweight (6)

Cons

No Cons

Best Uses

  • Everyday driving (29)
  • Replacement (23)
  • Restoration (7)
  • Performance driving (6)
    • Car & Truck:
    • Auto enthusiast (3), Casual driver (3), Truck enthusiast (3)
    • Reviewer Profile:
    • Casual driver (20), Auto enthusiast (10), Truck enthusiast (7), Mechanic (6)

Most Liked Positive Review

 

AC Delco spark plugs

This is the OEM replacement for my 1998 GMC Jimmy (and all the GM Vortec V6's out there). The original plugs were still running smoothly after 152,000 miles but the gas milage...Read complete review

This is the OEM replacement for my 1998 GMC Jimmy (and all the GM Vortec V6's out there). The original plugs were still running smoothly after 152,000 miles but the gas milage was dropping. You can't beat that kind of dependability or quality so why even look for an aftermarket plug. They have changed the design and part number from 41-992 (my old ones) to 41-993. These newer plugs have a tiny spark wire extending off of the center electrode instead of the flat rod. I guess this functions like a "lightning rod" and makes the spark more "focused".

NOTE: these are the Professional Platinum plugs; HOWEVER, the box is marked Iridium. Theses are not suposed to be Iridium plugs and are pre-gapped just like a platinum plug should be (around 0.06 on the 41-993). Maybe someone can add a comment if they know something. Yes its the correct box, both the boxes and the plugs indicate 41-993. Whats up with that ?

Installing a spark-plug is not hard, in principle, (loosen, remove, insert, tighten) but plugs on the Jimmy (Blazer or Bravada) are not a simple job because of their locations. Once you learn all the tricks its actually not so bad (except #3 plug, even after you know what to do its 10 minutes by itself). Yes these plugs cost a bit more (at list price) than some of the others but these are the plugs you want in your GM engine to get the optimum performance and longevity (unless you plan on re-engineering the entire ignition system with after-market performance parts). Use a coupon code at Advance Auto and you can get 40% off! Or just spend a couple of bucks now and be done with it, you don't want to do this plug change often. Unless you plan on modifing the entire ignition system just stick with what was designed for your motor. If these plugs run as well as the originals, they will outlast my ownership of the Jimmy (or me).

I have seen the mpg increase to the level I originally had when I bought the Jimmy (23.5 mpg highway). With the old plugs, it had slowly been dropping off over the last 30,000 down to about 20.7 mpg. I should have done this job 3 years ago.

VS

Most Liked Negative Review

 

one bad out of 6

out of 6 plugs had one with bad threads caused a skip and it would be the one hardest to reach.

out of 6 plugs had one with bad threads caused a skip and it would be the one hardest to reach.

Reviewed by 34 customers

Displaying reviews 1-10

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5.0

Great product so far

By 

from Flowery Branch, GA

About Me Auto Enthusiast

Verified Buyer

Pros

  • Easy To Install
  • Improves Engine Efficiency
  • Increases Power

Cons

    Best Uses

    • Everyday Driving
    • Replacement

    Comments about ACDelco Professional Iridium Spark Plug:

    Great product. Please check your parts before you leave the store. Advance shorted me two plugs. Should have had 8 total but when I arrived home only had 6. Had to send my son back to pick up the remaining two. 14 miles round trip.

    Comment on this reviewHelp Icon(earn points)

    (1 of 1 customers found this review helpful)

     
    4.0

    Great ACDelco Plugs but watch your gaps!

    By 

    from New Jersey

    About Me Auto Enthusiast, Casual Driver, Competitive Driver, Truck Enthusiast

    Level 1

    Pros

      Cons

        Best Uses

        • Everyday Driving
        • Replacement
        • Restoration

        Comments about ACDelco Professional Iridium Spark Plug:

        These are great plugs. ACDelco and Chevy, you can't go wrong. The only goof is Iridium-tipped plugs for most Chevy's should now be gapped to roughly 0.040, not the 0.060 these come from the factory as. Look around on the Chevy forums and you'll find this out quickly. I put them in as I got them, 0.060 gap, and my truck ran just a little rough. I checked around and found out about the new gap setting. Once I regapped them to 0.040 my truck runs like new. Don't forget the dielectric grease on the inside of the boot and you'll be good to go!

        Comment on this reviewHelp Icon(earn points)

        (1 of 1 customers found this review helpful)

         
        4.0

        ACDelco iridium

        By 

        from Ar

        About Me Casual Driver

        3 or more reviews submitted

        Pros

        • Durable
        • Easy To Install
        • Increases Power

        Cons

          Best Uses

          • Everyday Driving
          • Replacement
          • Restoration

          Comments about ACDelco Professional Iridium Spark Plug:

          i am finding out the hardway FAST that plugs do make a difference if you have a misfire condition, while putting a 2000 escalade back together i used a cheaper brand to save money and climbing hills it kept throwing a p0307 misfire condition, after switching to these (what it was supposed to have to begin with) the misfire on 7 went away.

          Comment on this reviewHelp Icon(earn points)

           
          5.0

          Perfect

          By 

          from Conroe texas

          About Me Casual Driver

          Pros

          • Increases Power

          Cons

            Best Uses

            • Everyday Driving

            Comments about ACDelco Professional Iridium Spark Plug:

            Oe plug thumbs up

            Comment on this reviewHelp Icon(earn points)

            (3 of 4 customers found this review helpful)

             
            5.0

            Oem Plugs only way to go

            By 

            from Jackson, Ohio

            About Me Mechanic

            Verified Buyer
            Helpful Reviewer

            Pros

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

            Cons

              Best Uses

              • Everyday Driving
              • Replacement
              • Restoration

              Comments about ACDelco Professional Iridium Spark Plug:

              Putting OEM spark plugs in is the same as was new from the factory.

              Comment on this reviewHelp Icon(earn points)

              (2 of 4 customers found this review helpful)

               
              5.0

              Good product. Car running great! No mo

              By 

              from Rootstown, ohio

              About Me Casual Driver

              Verified Buyer
              Level 1

              Pros

              • Durable
              • Easy To Install

              Cons

                Best Uses

                • Everyday Driving
                • Replacement

                Comments about ACDelco Professional Iridium Spark Plug:

                Fairly easy to install. Spec right on. I would buy these spark plugs again. So far so good.

                Comment on this reviewHelp Icon(earn points)

                (2 of 2 customers found this review helpful)

                 
                5.0

                Best spark plug to use in a vortec motor

                By 

                from Lakeland

                About Me Auto Enthusiast, Casual Driver, Mechanic, Truck Enthusiast

                Ask me a question

                Level 6

                Pros

                • Durable
                • Improves Engine Efficiency
                • Increases Power
                • Oem Plug
                • Pre gapped

                Cons

                • A bit pricey

                Best Uses

                • Everyday Driving
                • Replacement
                • Restoration

                Comments about ACDelco Professional Iridium Spark Plug:

                I purchased a set of these spark plugs for my 2005 Chevy Silverado 4.3 Vortec V6. AC Delco spark plugs are installed at the factory for GM trucks so I decided to stick with AC Delco. These came pre gapped for my application and are MUCH better than other brands available. Do yourself a favor if you own a GM vehicle, especially a Vortec V6 or V8 engine and use these plugs.

                Comment on this reviewHelp Icon(earn points)

                (0 of 2 customers found this review helpful)

                 
                5.0

                Great, high quality plugs

                By 

                from Nebraska

                About Me Auto Enthusiast, Casual Driver, Mechanic

                Verified Buyer
                Level 2

                Pros

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

                Cons

                  Best Uses

                  • Everyday Driving
                  • Replacement

                  Comments about ACDelco Professional Iridium Spark Plug:

                  These are excellent quality replacement plugs for my 2005 Silverado 4.3. Gapped correctly right out of the box (I always check to be sure).

                  Comment on this reviewHelp Icon(earn points)

                  (2 of 3 customers found this review helpful)

                   
                  2.0

                  one bad out of 6

                  By 

                  from winston salem nc

                  About Me Casual Driver

                  Verified Buyer
                  Level 3

                  Pros

                    Cons

                      Best Uses

                      • Everyday Driving

                      Comments about ACDelco Professional Iridium Spark Plug:

                      out of 6 plugs had one with bad threads caused a skip and it would be the one hardest to reach.

                      Comment on this reviewHelp Icon(earn points)

                      (0 of 2 customers found this review helpful)

                       
                      5.0

                      A-1 PLUGS

                      By 

                      from STOCKBRIGE GA.

                      About Me Casual Driver

                      Verified Buyer
                      Level 3

                      Pros

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

                      Cons

                        Best Uses

                        • Everyday Driving

                        Comments about ACDelco Professional Iridium Spark Plug:

                        BEST PLUGS

                        Comment on this reviewHelp Icon(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. For further assistance, please review your support options on our Contact Us page.

                        16 Questions | 22 Answers
                        Displaying questions 1-10Previous | Next »
                        • Q:

                          What Autolite Iridium XP plug is compatible to the AC 41-993?
                          Asked on 3/23/2015 by Bate from Hampton, Va

                          1 answer

                          • CUSTOMER CARE

                            A:

                            Hi Bate, I'm glad to assist you! This ACDelco Professional Iridium Spark Plug - Part No. 41-993 crosses the Autolite Double Platinum Spark Plug - Part No. APP605. Generally, the platinum spark plug crosses the other platinum plug, not iridium.

                            Answered on 3/24/2015 by Solomon
                        • Q:

                          Can I use these plugs on an Chevy impala 2005
                          Asked on 12/12/2014 by Snoopy from Jacksonville FL

                          1 answer

                          • CUSTOMER CARE

                            A:

                            Hi Snoopy! To check compatibility, please provide the sub-model and engine size of Chevy impala 2005.

                            Answered on 12/12/2014 by Solomon
                        • Q:

                          On spark plugs does higher heat range mean a hotter spark?
                          Asked on 11/7/2014 by Old Steve from Ohio

                          1 answer

                          • CUSTOMER CARE

                            A:

                            Hi Old Steve, glad to assist you! The heat range of a spark plug is indicated within the manufacturer's part number for each plug. Also the dimension and specification will help us to find the difference between the hot and cold spark plugs. For example please visit this link. URL - http://www.ngksparkplugs.com/pdf/DYK_HeatRanges.pdf

                            Answered on 11/8/2014 by Steve from AAP
                        • Q:

                          iam looking for the performance spark plug for my Chevrolet suburban c1500
                          Asked on 12/23/2013 by bojack from cairo ga

                          1 answer

                          • CUSTOMER CARE

                            A:

                            Hi bojack, glad to assist you! To locate the exact performance spark plug, please provide us the year, and engine size of your vehicle.

                            Answered on 12/24/2013 by Steve from AAP
                        • Q:

                          rebate on 41993 spark plugs
                          Asked on 2/15/2013 by fast

                          1 answer

                          • CUSTOMER CARE

                            A:

                            With reference to the ACDelco Spark Plug (Part No. 41-993), for more information about your rebate you may visit our rebate website at https://advanceautoparts.4myrebate.com/. This website will provide you with the status of your rebate, find rebate forms, and how to contact our rebate customer service center. 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 2/16/2013 by Steve from AAP
                        • Q:

                          I have a 02 S-10 ZR2 pkg with a 4.3L. will these plugs fit? The # I have is 41-948 or has the # changed? I want the right plugs in my vehicle.I don't want to have any problems or and ses light.
                          Asked on 12/25/2012 by Lt from Norwood Mass

                          1 answer

                          • CUSTOMER CARE

                            A:

                            This ACDelco Spark Plug (Part No. 41-993) is an exact fit for your 2002 Chevrolet S10 @GAP .060. For further assistance, please feel free to call us at 1-877-238-2623 or visit your nearest Advance Auto Parts store and one of our representatives would be more than happy to assist you.

                            Answered on 12/25/2012 by Steve from AAP
                        • Q:

                          Is this price for one plug or all six in one pack?
                          Asked on 4/15/2012 by DiGar from Elizabethtown, KY

                          3 answers

                          • A:

                            That' per plug my friend!

                            Answered on 7/3/2012 by Larry from Candler, NC
                          • CUSTOMER CARE

                            A:

                            This part ACDelco Spark Plug, Part No. 41-993 manufactured by ACDelco is sold individually.
                            For compatibility of this part with your vehicle, please provide your vehicle make, model and engine specification.

                            Answered on 4/16/2012 by Aaron from AAP
                          • A:

                            most spark plugs are priced per plug. more expensive plugs are higher quality, ie. iridium

                            Answered on 8/3/2012 by fil from c-bus ohio
                        • Q:

                          for 6.95 i highly doubt that this is just one plug how many am i getting for this price?
                          Asked on 3/31/2012 by Stephen the mechanic from Millville NJ

                          2 answers

                          • A:

                            $6.95 is for one plug

                            Answered on 6/2/2016 by Bobby from Des Plaines, IL
                          • CUSTOMER CARE

                            A:

                            This part ACDelco Spark Plug, Part No. 41-993 manufactured by ACDelco is sold individually.
                            For compatibility of this part with your vehicle, please provide your vehicle make, model and engine specification.

                            Answered on 4/1/2012 by Aaron from AAP
                        • Q:

                          are these plugs nickle plated
                          Asked on 2/13/2012 by mickey from tazewell va

                          1 answer

                          • CUSTOMER CARE

                            A:

                            This ACDelco Spark Plug with part# 41-993 is an Original Equipment (OE) supplier. This has dual platinum tip for improved resistance to spark erosion and corrosive combustion chamber environment.

                            Answered on 2/14/2012 by Vincent from AAP
                        • Q:

                          chev 79 c-10 5.7 engine, ac plugs part no#41-993 platinum.what is the correct plug gap. is it 45 or 60? 35-gap is for the older plugs like 44RT.
                          Asked on 11/14/2011 by Anonymous from middletown,va

                          1 answer

                          • CUSTOMER CARE

                            A:

                            Initial suggested settings for spark plug gaps are: Single plug: 0.028 - 0.032", Dual plug: 0.025 - 0.030".

                            Answered on 11/14/2011 by Steve from AAP
                        Displaying questions 1-10Previous | Next »

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