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Thread: Plugs & Wires

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  1. #1

    Default Plugs & Wires

    When do you typically change them.... I believe the manual calls for them at 100,000, but I'm wondering what you guys are typically doing.
    2007 Chevy Silverado LT1 Crew Cab
    4x4, 5.3 Vortec Flex Fuel with Active Fuel Management

  2. #2


    Quote Originally Posted by duckduckdog View Post
    When do you typically change them.... I believe the manual calls for them at 100,000, but I'm wondering what you guys are typically doing.
    When my Truck was New, I removed/replaced the old ones, which had.....85,000 miles on them, when looking at the old ones, they looked Great!!, but I went ahead and installed new plugs and to when is a good time to replace the plugs-wires..........IMO depends on how many miles you have on them and also How your Truck is Running????

    Edit:.....I would also mention, that I just installed, a new set of Plugs-n-Wires, my truck has right at 170,000, and once again they(Old Plugs)Looked Great....both sets of old plugs, could have gone to 100,000 miles with no problem.
    Last edited by 99'HEARTBEAT; 12-09-2013 at 09:32 AM. Reason: Added Infor.


    5.3 l 3.73 l G80

  3. #3


    I agree with @99'HEARTBEAT, I replaced the plugs in my 2002 with 80,000 miles and they looked fine. The gap was still within spec. I also replaced them in my 2003 yukon xl with 120,000 on it when I bought it and they still looked pretty good and were still within spec. I don't mind replacing them every 75,000, they are not all the expensive and it gives me a change to get the old plugs out and anti-seize the new plugs. One of my Mechanical Engineering professors worked for Ac Sparkplug, he was the lead engineer on the platinum and iridium plug development projects. He said that when they were developing them, they considered them to be a "lifetime" plug. They were more concerned about the plug seizing to the head passed 100,000 miles than the plug failing at that mileage. He said that most of the tests they ran the plugs outlasted the engine itself. It was decided that if the plugs were to start having issues at high mileage (over 300,000) the consumer would not be very happy about the cost of complete head replacement because the plugs were stuck.

    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,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  4. #4


    Truck is still running great, just didn't want to wait too long and have them siezed up. Had that happen in a '94 S-10 and it was a bear!

  5. #5


    When the Time comes for you to install a new set of plugs, the ones you want to go with are the A/C Delco Iridium Tip Spark Plugs as mentioned above by Pikey

    A/C Delco Iridium Plugs,

    Last edited by 99'HEARTBEAT; 12-09-2013 at 09:34 AM.

  6. #6
    TRPLXL2's Avatar
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    Jan 2009
    Norwalk, Ohio
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    My 01 s10 4.3 got a tune up at 56,000, rough idle and would stall a lot. 3 out of 6 were fouled, ac delco plugs are awesome, but they don't recover once they are fouled.

    i pull the plugs out right when the vehicle is brand new now, I smear the threads down with never seize made for aluminum heads and reinstall them. I could tell you some good stories about aluminum heads lol!!
    2004 Chevy Colorado
    LS1 5.7 swap/TBSS rear axle swap

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