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  1. #1

    Default Spark plug question. 41-985 vs 49-110

    I am going to change the plugs in my 2005 yukon xl. The manual calls for a AC 41-985 iridium but the plugs that all of the parts stores list is a AC 41-110 iridium. Does anyone know the difference between the two? I can not find the 985 anywhere. Thank you in advance for sharing your thoughts

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors, http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  2. #2

    Default

    Quote Originally Posted by Pikey View Post
    I am going to change the plugs in my 2005 yukon xl. The manual calls for a AC 41-985 iridium but the plugs that all of the parts stores list is a AC 41-110 iridium. Does anyone know the difference between the two? I can not find the 985 anywhere. Thank you in advance for sharing your thoughts
    Mike.....there's no difference between the A/C 41-985 and the A/C 41-110 they are the Same Plug........G.M. Changed the Part Number to the A/C 41-110,


    The Below information is from A/C Delco's Online Parts Catalog,
    SPARK PLUG ASM
    Part Number: 41-110
    Product Notes:
    Iridium-Spark Plug
    .040 GAP

    Per Vehicle: 8; Years: 1999-2005

    G.M.C. YUKON XL 1500
    2005 V8-323ci 5.3L F/I Vin T
    2005 V8-325ci 5.3L FLEX/FI Vin Z





    Last edited by 99'HEARTBEAT; 10-02-2012 at 05:30 PM. Reason: Added Infor.

    MIKE


    99"SILVERADO
    5.3 l 3.73 l G80
    BLACK BEAR CUSTOM TUNE
    SNUGTOP l COLORMATCH l KATZKIN










  3. #3

    Default

    Quote Originally Posted by 99'HEARTBEAT View Post
    Mike.....there's no difference between the A/C 41-985 and the A/C 41-110 they are the Same Plug........G.M. Changed the Part to the A/C 41-110,


    The Below information is from A/C Delco's Online Parts Catalog,
    SPARK PLUG ASM
    Part Number: 41-110
    Product Notes:
    Iridium-Spark Plug
    .040 GAP

    Per Vehicle: 8; Years: 1999-2005

    G.M.C. YUKON XL 1500
    2005 V8-323ci 5.3L F/I Vin T
    2005 V8-325ci 5.3L FLEX/FI Vin Z





    Thanks Mike. I was hoping that you would respond as it seem like you always have the info when it comes to GM parts!

  4. #4

    Default

    Quote Originally Posted by Pikey View Post
    Thanks Mike. I was hoping that you would respond as it seem like you always have the info when it comes to GM parts!
    Glad to help Mike, and regarding the Gap on the New Plugs, below is from a G.M. Service Bulletin,

    PARTS INFORMATION:

    A New Spark Plug has been released for use in the above vehicles. The New Spark Plug has an Iridium tip instead of the current Platinum tip. Due to the different tip design, the gap of the spark plug has also changed. The New Spark Plug, A/C Delco Iridium Part Number 41-110, is Gapped to 1.01mm (0.040 inches) when the Spark Plug is made. The Spark Plug Gap is set during Manufacturing and should Not be Changed to the Gap required with the Platinum plug, or Damage to the Spark Plug may result.



  5. #5

    Default

    I pulled out 3 plugs a few minutes ago. They came out easily. They look new and the gap is .038". So, looks like I have to start investigating other causes of my sudden MPG decrease. Thanks again for the info

  6. #6

    Default

    Quote Originally Posted by Pikey View Post
    So, looks like I have to start investigating other causes of my sudden MPG decrease. Thanks again for the info
    I would look at the front O2 sensor(s)
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

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