Pontiac Grand Prix Forums : Grandprix
 

Grand Prix Forums is the premier Pontiac Forum on the internet. Registered Users do not see the above ads. Please Register - It's Free!

Pontiac Grand Prix Forum - Welcome Register today! Contact us!

Results 1 to 13 of 13
  1. #1
    GT Level Member Madness's Avatar
    Join Date
    Nov 2009
    Location
    A little late
    Posts
    468
    Chats
    4

    Default ? Max time/miles for original spark plugs

    We have a 04 Grand Prix GT w/116,000 miles. How long can we stretch out the original plugs? Trying to save everything we can for a house, but dont want to have other car problems down the road.

    Currently, we only put about 7,000 miles on this car a year.

    What is the longest people on here have seen factory plugs go?
    Favorite Quote: You can't fix stupid!!


    http://www.youtube.com/watch?v=0gxKStPXyn8

  2. #2
    GTP Level Member cheatah faheatah's Avatar
    Join Date
    May 2016
    Location
    Rouge Island
    Posts
    846
    Chats
    2265

    Default Re: ? Max time/miles for original spark plugs

    Change 'em out already. It's short money for plugs. Mileage will improve, and improper combustion could lead to a clogged cat..... No Bueno Now that's madness.lol
    not what it looks like

  3. #3
    Donating Users coolone's Avatar
    Join Date
    Nov 2011
    Location
    NY
    Posts
    2,319
    Chats
    1634

    Default Re: ? Max time/miles for original spark plugs

    There are no plugs that last 100k, don't care what any manufacture says...

    And honestly, you're talking $12 for plugs and you're worried about that? You shouldn't be driving a car if you cannot accept the required maintenance! At 110k you should have all you fluids changed, including transmission, brakes, probably rotors, all filters, etc. Do it yourself and save a bundle, and do NOT flush the transmission, it's a pan drop and filter or nothing. Your suspension is probably crying for renewal as well and more!

    Good luck!
    Overkill BBC Cam, YT 1.8 RR's, Rhodes Lifters, STGII Heads, GenV, Pacesetters, 3" Exh to Tips, TEP Trans. N*, ID 75# injectors/E85 coming soon

  4. #4
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
    Join Date
    Sep 2009
    Location
    Rogers, MN
    Posts
    20,608
    Chats
    80891

    Default Re: ? Max time/miles for original spark plugs

    That may be just opinion based but the modern Iridium and double platinum plugs are very long lasting. Can't tell you how many vehicles I've seen with will over 100,000 miles running them without issue. I still think the life cycle is 80-100k miles for how cheap they are to replace.

    It's 12 bucks if you want to replace them in 2 years, copper core plugs are only good for 15-20k miles on a waste spark system before they show wear. Then it's $40-50 if you never want to do them again.

    SMGPFC Member #1

  5. #5
    SE Level Member
    Join Date
    May 2016
    Location
    Burns City, Indiana
    Posts
    112
    Chats
    11

    Default Re: ? Max time/miles for original spark plugs

    So $50 in maintenance will stop you from getting a house?

  6. #6
    GT Level Member
    Join Date
    May 2017
    Location
    Dirtyzville, Mizzery
    Posts
    254
    Chats
    593

    Default Re: ? Max time/miles for original spark plugs

    Put AL606's in it.

    It'll last more than 20k miles.

    If you're that tight in cash I would look elsewhere.
    1999 Chevrolet Silverado K1500 Classic Z71 - Intake/Gibson Exhaust - The Daily
    2004 Chevrolet Corvette MRM A4 - AFE S2 Intake/TSP Catless LT's/3" ORX/C6 ZR1 Wheels/Exhaust Tips
    Sold WBody's: '98 GT, '98 GTP, '00 GTP, '03 GTP, '05 GXP

  7. #7
    SE Level Member
    Join Date
    May 2016
    Location
    Burns City, Indiana
    Posts
    112
    Chats
    11

    Default Re: ? Max time/miles for original spark plugs

    WHY does everyone keep recommending Autolite garbage. I work as a diag tech and take these damn things out ro cure misfires so often it amazes me the company is still in business. I have seen these create misfire issues in just about any brand of car out there. Heck neighbor brought his CADILLAC over the other day. Random misfires, ran like s*it. Took out Autolites he claimed cost him $2x.00 each. Went and got the appropriate ACDelco in and car quit missing. Was really worried about the converter melting down as it had missed so much but I think it will live.
    My buddy was using the dang things in a $25k+ drag engine. They fought runnability issues for 2 days on dyno. Replaced the Autolites with AC Delco, ran great but his engine builder kept harping on how bad they were so we switched over to NGK.
    Engine was VERY plug heat range sensitive, first set it lost power till it got good and warm, so we did some research and went UP 2 ranges and car liked that. Pretty much what I have found NGKs tend to run cool.
    But then 30 yrs of working on and tuning engines means nothing I guess.
    Good Luck but 100+k is toooooo long to go on plugs. Platinum and Iridium plugs can RUN 100k but I really dislike pushing ignition parts long miles. Tune ups are too cheap.
    Factory plug is AC 41-101 Iridiums from factory and Autozone shows them for $7.99 and have $3.00 per piug rebate up until December http://contentinfo.autozone.com/znet...en_US/1709.pdf
    Thats plugs that will go another 75K+ (reason I prefer earlier changes is the last half of plug life generally gives lower efficiency. ) for $4.99 each after rebate.

  8. #8
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
    Join Date
    Sep 2009
    Location
    Rogers, MN
    Posts
    20,608
    Chats
    80891

    Default Re: ? Max time/miles for original spark plugs

    Mod a 3800 and then you'll know why copper core autolites are the business.

    Copper core plugs just plain old work in a 3800 when extra power in involved. It's the same with some LS power cars, copper core plugs are just good with high horsepower.

    I ran copper plugs for over 4 years, changed them once a year for 12 bucks and never missed a beat.

    If you want a plug for a daily driver or do not want to replace them alot go with Iridium plugs on a 3800, heck they even make factory iridium plugs for the CTS-V and Corvette/Camaro's that are cooler plugs that are run for boosted applications.

    Autolites have their place, like with mopar hemi's or maybe a modded 3800 from time to time.

    SMGPFC Member #1

  9. #9
    Donating Users coolone's Avatar
    Join Date
    Nov 2011
    Location
    NY
    Posts
    2,319
    Chats
    1634

    Default Re: ? Max time/miles for original spark plugs

    Monza, it's because everything that can be tried, has been in these engines! There's no unicorns left to find and its been found that as FFDP mentions, the Copper Core plugs work best on the 3800/L67 SC engine, no use fighting it. Lol
    Overkill BBC Cam, YT 1.8 RR's, Rhodes Lifters, STGII Heads, GenV, Pacesetters, 3" Exh to Tips, TEP Trans. N*, ID 75# injectors/E85 coming soon

  10. #10
    GTP Level Member LeadfootCJ7's Avatar
    Join Date
    Oct 2012
    Location
    Houston, TX
    Posts
    654
    Chats
    0

    Default Re: ? Max time/miles for original spark plugs

    If you are asking, you should have replaced them already.
    2007 Grand Prix GXP;2002 Camaro Z28 - tune, CAI, and exhaust
    2006 GMC 2500HD - ATS high flow manifolds and uppipes, turbo back exhaust, blocked EGR, Denali headlights, Reflexxion Cown Hood
    1994 Olds Cutlass Supreme 2 door

  11. #11
    SE Level Member
    Join Date
    May 2016
    Location
    Burns City, Indiana
    Posts
    112
    Chats
    11

    Default Re: ? Max time/miles for original spark plugs

    Not talking copper core talking autolites. I have tuned 1000hp n2o Chevy's/Ford's and have absolutely zero faith in them as NO manufacturer uses them oe.
    I actually have better luck reading Ac Delcos on n2o. Just look for bubbling on ground straps. Every other plug except NGK just melted. Well Ford's seem to like MOTORCRAFT. And I know AC had autolites assembling plugs back in mid/ late 90s and we has so many that were dead out of box. Just my my experience.

  12. #12
    SE Level Member
    Join Date
    Jun 2017
    Location
    In a state of constant panic
    Posts
    18
    Chats
    0

    Default Re: ? Max time/miles for original spark plugs

    RockAuto.com I'd your friend. I changed all my plugs at 97k miles and got the most expensive Bosch plugs they offered. Only cost me 3.30 for two plugs, so right under $10.

  13. #13
    GTP Level Member
    Join Date
    Aug 2012
    Location
    st louis park, MN
    Posts
    615
    Chats
    266

    Default Re: ? Max time/miles for original spark plugs

    Quote Originally Posted by MonzaRacer View Post
    So $50 in maintenance will stop you from getting a house?


    To take it a step further, if you can't do $50 in automobile maintenance, do not buy a house.
    2008 Grand Prix Base: Engine cover delete , flipped dogbone bushings, Transgo shift kit, Hayden 403 trans cooler,
    Quote Originally Posted by Yarbeau View Post
    we are all anal about our vehicles. Otherwise we would not be on an extinct platforms forum debating 3000 dollars cars!

Similar Threads

  1. 160,000 klm original ac delco iridium spark plugs
    By Premiergp in forum General Grand Prix Discussion
    Replies: 8
    Last Post: 10-25-2016, 09:08 PM
  2. SOLD 1997 Red GTP 43,800 original miles. $5000. OBO
    By darryl5 in forum For Sale - Vehicles
    Replies: 2
    Last Post: 09-01-2014, 06:18 PM
  3. Replies: 34
    Last Post: 05-28-2012, 10:53 AM
  4. Original Tires/Spark Plugs
    By quickster in forum 04+ Specifics
    Replies: 30
    Last Post: 04-05-2011, 12:07 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •