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Thread: Minor misfire

  1. #1
    Join Date
    Jun 2010
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    Boston
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    Minor misfire

    Hi.. I have a misfire but it's not enough to set a code...It only happens when I go into 3rd or overdrive and give a little throttle...if I give it more throttle it stops. I used to get this in my towncar and I would replace some of the ignition coil boots. I have done this in the Marauder but it it still there. I am going to try replacing the coils since they are original, 20 years old now.

    Anyone have thoughts on this?

    Steve

  2. #2
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    Need a scan tool to read the cylinder contribution to find the mis. Try n get that done before replacing things. A mis could be injector, coil or spark plug. Even the wiring sometimes.


    Sent from my iPhone using Tapatalk Pro

  3. #3
    Join Date
    Jan 2003
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    I've had this happen, took it to the dealer for diagnostic. They told me which cylinder and I changed the coil myself. Fixed it. Quicker and cheaper that trial and error. Or you could just replace all 8, which will cost more than the diagnostic. Until it throws a code, handheld scan tool won't tell you which cylinder is intermittently missing.
    Thanks to Darrin @ BC Automotive:
    $1800 and it was worse than when he started!

    Brian (FordNut) FPG # 1458 of 7838
    03 MM 300A (Lotsa mods, 130k mi) was 303rwhp/318rwtq N/A
    then 476/410 D1SC ProCharged on stock block
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    then 365/369 N/A on 5.3 wet sleeved Teksid alum big bore stroker
    Now 751/617 3.4L Whipple on 5.3 Boss5.0 iron big bore stroker

    03 MM 300B Silver (Mostly stock, originally wife's car, 370k mi) FPG # 7053 of 7838 or 49 of 417 SB
    03 MM 300B Silver, Stock, wife's next one, 136k mi FPG # 7134 of 7838 or 89 of 417 SB
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  4. #4
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    My son owns a truck parts business and he has a very expensive 2000.00 scanner. That could not detect what cylinder.

  5. #5
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    Quote Originally Posted by bluesboyst View Post
    My son owns a truck parts business and he has a very expensive 2000.00 scanner. That could not detect what cylinder.




    You need to drive it with somebody and they need to watch the values on the scanner, I used a snap on one to figure mine out.


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  6. #6
    Join Date
    Jun 2008
    Location
    Waukesha, WI
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    Linked incorrect coils
    Last edited by blazen71; 01-09-2024 at 12:08 PM. Reason: Linked incorrect coils
    You "feel" the difference because you want to "feel" the difference. Since you just spent money on the upgrade you "have" to feel the difference

    I'm looking to eliminate the double pump process I have to follow right now to get the pedal hard

    2004 300A Procharger #0010 D1X
    2003 300A Procharger #0017 D1SC (SOLD. Last I heard, it was in Washington State)

  7. #7
    Join Date
    Jun 2008
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    I believe you can also use the newer GT500 coils.
    You "feel" the difference because you want to "feel" the difference. Since you just spent money on the upgrade you "have" to feel the difference

    I'm looking to eliminate the double pump process I have to follow right now to get the pedal hard

    2004 300A Procharger #0010 D1X
    2003 300A Procharger #0017 D1SC (SOLD. Last I heard, it was in Washington State)

  8. #8
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    Minor misfire

    Quote Originally Posted by blazen71 View Post
    I believe you can also use the newer GT500 coils.
    You posted a link for 2V coils...


    Sent from my iPhone using Tapatalk Pro

  9. #9
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    Jun 2008
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    Quote Originally Posted by 03Merc View Post
    You posted a link for 2V coils...


    Sent from my iPhone using Tapatalk Pro
    The nerve....
    You "feel" the difference because you want to "feel" the difference. Since you just spent money on the upgrade you "have" to feel the difference

    I'm looking to eliminate the double pump process I have to follow right now to get the pedal hard

    2004 300A Procharger #0010 D1X
    2003 300A Procharger #0017 D1SC (SOLD. Last I heard, it was in Washington State)

  10. #10
    Join Date
    Jun 2010
    Location
    Boston
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    I went to a ford parts dealer here in Massachusetts Quirk Ford... For a genuine ford part they were only 51.80 per coil. Since all the coils in the car were 20 years old I bought eight of them. Problem solved. It was on the left side....what a difference.....

  11. #11
    Join Date
    Apr 2015
    Location
    Maryland
    Posts
    35
    8pcs Ignition Coil DG512 & Motorcraft Spark Plug for Lincoln Navigator Blackwood | eBay

    Will these work on our Marauders? Are these Genuine Motorcraft Coils and Spark Plugs?

    My Dealer last week quoted me a price of $63.00 for just 1 coil.

  12. #12
    Join Date
    Apr 2015
    Location
    Maryland
    Posts
    35
    8+ Genuine Motorcraft Ignition Coil Pack DG512/543 4L7Z12029AB | eBay Ok, now I am confused, the above part number was 4L7Z12029AA, but I think this is the correct part number 4L7Z12029AB, any ideas?

  13. #13
    Join Date
    Apr 2015
    Location
    Maryland
    Posts
    35
    All right I think I figured this out, the part number ending in AA is for the 5.4 Liter Ford Engine, and the part number ending in AB is for our 4.6 Liter Engines our Marauders. Big price difference between the 2 part numbers for a pack of 8 Ignition Coils.

  14. #14
    Join Date
    Sep 2005
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    APPLE VALLEY,CA
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    Those cost way too much. Order these M12029-4V. About $271 on Amazon.

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