Changing Plugs and Wires

Discussion in 'Engine & Drivetrain' started by Sdp1234, Dec 14, 2019.

  1. Sdp1234

    Sdp1234 Full Access Member

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    I don’t have records for my Yukon Denali 6.0 2004. It 170k Should I change the plugs and wires? No perceived problems but I wondered if it was prudent to do it since I don’t know their condition. If so, what plugs and wires are best? Thanks
     
  2. wjburken

    wjburken Supporting Member

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    Change them.

    Let’s assume the previous owner did change plugs. They probably did so around 100K. That would put 70K on your plugs and a good time to change them. Now let’s assume they didn’t. It’s definitely time to change them.

    I prefer AC Delco myself but others on here have tried NSK with decent luck.

    https://www.tahoeyukonforum.com/threads/best-ignition-system-for-my-2004-tahoe.115343/#post-1389718

    https://www.tahoeyukonforum.com/threads/170k-on-factory-plugs.115337/
     
  3. rockola1971

    rockola1971 Full Access Member

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    I had to do mine on my 05 Yukon Denali because the misfires were getting horrible. The engine has over 315k and I swear the plugs and wires looked to be original. The spark plugs electrode was gone...as in no there! The wires were dry rotted and just fell apart when I removed them. Runs much better now. Have fun with the passenger rear cylinder. Its fun trying to get the old wires off and new ones on. Getting to the stupid plugs is a blast too.
     
    Last edited: Dec 15, 2019
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  4. PNW VietVet

    PNW VietVet Full Access Member

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    What Wade and Mike said but you could pull an easy one and post a pic here, close up, so we can see what they look like. Plus, if you do change them it is a perfect time to see if there is any oil or misfire or fuel delivery problems in any given cylinder. If you pull them all, replace them all and do the wires. AC Delco parts is what came in it, I would stick with them.
     
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  5. 2010gmcyukon

    2010gmcyukon Full Access Member

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    I agree with what the others said; change em out. You should be able to get AC Delco plugs and wires pretty reasonable, just shop around a little. I found a decent price at rock auto on mine.
     
  6. joexyz98

    joexyz98 TYF Newbie

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    but then again if its not broken dont fix it sorta in same situation 03 yukon had it 8 years over 100 thousand miles not missing a beat no rough idle no engine knock , no misfiring
     
  7. drummin1

    drummin1 TYF Newbie

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    I know on my 2015 Yukon Denali it was recommended at 100K, I did it even though there were no issues. I think it's just a good, high miles thing to do.
     
  8. wjburken

    wjburken Supporting Member

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    It’s all about personal preference with when you want to address a problem, address it before it happens or address it after it happens. I am firm believer in Preventative/Predictive Maintenance not Reactive Maintenance. Having spent the last 20+ years designing and building things ranging from semi-trailers to truck mounted snow/ice control equipment to Non-Destructive test equipment and now high speed automated packaging equipment, it is a proven fact that intelligent preventative/predictive maintenance saves money and prolongs the life of equipment. I apply this same principle to the vehicles that I drive. I, personally, am amazed that folks will hesitate to invest $100 or so to replace plugs and wires on their vehicle once every 100K miles.

    If you are good with stretching every last mile you can out of a set of plugs and only change them after you are starting to have problems, then you do you. You know a lot more about the history of your vehicle than the OP does about his, which is why he was asking.
     
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  9. PNW VietVet

    PNW VietVet Full Access Member

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    AS my dad told me once, "Maintenance pays and Breakdowns cost". Always better to do the recommended maintenance when you know what the cost is and when it will be done. Breakdowns leave uncertainty and typically cost more and stretch out the time when it will be done.
     
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  10. avalonandl

    avalonandl Full Access Member

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    With wires its more age. Plugs definitely change. Parts are cheap, maybe 200 for AC Delco. Will perform better.
     

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