99 Mercury Grand Marquis 4.6 misfire diagnostic and fix.

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  • เผยแพร่เมื่อ 11 ต.ค. 2024
  • Hope this helps someone with similar issues.
    Gotta keep grand pa's whip rolling!

ความคิดเห็น • 27

  • @paultro8457
    @paultro8457 ปีที่แล้ว +4

    My 99 marquis started skipping a little at idle today. I changed the intake manifold about 1000 miles ago. And the spark plugs. But I like that kit you got at Harbor Freight. Gonna have to pick one up. Thank you for giving me a starting point to diagnose the issue. Car only has 117K on it.

  • @rustyyb8450
    @rustyyb8450 ปีที่แล้ว +7

    A 1999 Grand Marquis has no OBD code to indicate an fuel injector's electrical connection has failed. Misfire can also come from a fuel injector failure. I have a 1999 Grand Marquis. An injector electrical connector had somewhat slipped out of its socket because the connector release tab had broken off. Not noticing this issue with the broken release tab, I'd check and later replace that cylinder's coil pack and would inadvertently press on injectors electrical connector which would temporarily reestablish connection. The engine would run perfectly for a while until vibrations disconnected the coil pack again. Very frustrating. Finally noticed the issue when the process of elimination led me to consider the fuel injectors as a source of misfire. Realizing how to disconnect the injector's electrical connection revealed the problem behind the issue.

    • @johnjimenez2278
      @johnjimenez2278 3 หลายเดือนก่อน

      Did you end up replacing the pigtails?

  • @tygertyger8597
    @tygertyger8597 ปีที่แล้ว +4

    Many thanks for this vid. I have a 2000 Crown Vic with a coolant leak I absolutely cannot find. I will definitely check this area for the leak. Thanks.

  • @randyhun1607
    @randyhun1607 ปีที่แล้ว +2

    I appreciate the information-helped with my ‘03 Marquis!

  • @CG-iu1nq
    @CG-iu1nq 2 ปีที่แล้ว +5

    Only tighten them intakemainfold to 18 ft lbs and pay attention to the torque sequence fixed mine

  • @wk2268
    @wk2268 ปีที่แล้ว +1

    Same issue with my kids car.... Also replaced the intake manifold 2 years ago and it leaks again. #1 cylinder hole full of burnt crap then it fouls out the coil pack and triggers a misfire code. I'll try your permatex trick but I told the kid he needs to unload this money pit pig soon... Thanks for your video... Think I might invest in the coolant pressure leak tester....

    • @ElectronicMechanic50
      @ElectronicMechanic50  ปีที่แล้ว +2

      Yea the coolant leak tester is a great tool! I haven't had an issue since sealing the #1 spark plug boot with permatex just add a cup or so of coolant every couple months lol

  • @DRBRIGHT_213
    @DRBRIGHT_213 7 หลายเดือนก่อน

    I think I'm having this identical issue ..late 2001 Marq, sat for 1-2 years, new fuel pump and she ran fine until this last cold weather spell

  • @chadwhitfield379
    @chadwhitfield379 ปีที่แล้ว +1

    Thanks bro help me alot

  • @tastytraveling365
    @tastytraveling365 2 ปีที่แล้ว +2

    Get a ford racing intake manifold. That is the only me Bruda

  • @alexlopez-yk6lf
    @alexlopez-yk6lf 6 หลายเดือนก่อน +1

    After market manifolds for these 4.6 will only last 2 to 3 years, they don't make oem anymore,, i been replacing mine on warranty,, if you are planning to keep vics,, marquis, towncars, mustang F 150, get ready for this repair periodically,,, bad design to put intake and coolant ports next to each other separated by a gasket they know is going to fail

  • @mafatone
    @mafatone ปีที่แล้ว +1

    These cars suck big time! Good video. TY

  • @compagordo9134
    @compagordo9134 5 หลายเดือนก่อน

    So what parts need to be changed for this repair?

  • @nightstorm9128
    @nightstorm9128 ปีที่แล้ว +1

    If it's oil then it's spark plug seals...if it's coolant then it's head gasket...

    • @benweil7572
      @benweil7572 ปีที่แล้ว +5

      Coolant could be intake manifold

  • @bartokthemagnifycent7078
    @bartokthemagnifycent7078 ปีที่แล้ว

    Nice work diagnosing the problem as a coolant leak! Are you not going to fix it?

    • @ElectronicMechanic50
      @ElectronicMechanic50  ปีที่แล้ว +2

      I retourqed the coolant tubes and installed a new spark plug boot and it stopped leaking

  • @BigGroovyOg
    @BigGroovyOg ปีที่แล้ว

    I started my 98 crown Vic. A loud pop sound happen right after I cranked it up. Turned it off quickly. Then I smelt something burning. I tried cutting it back on. Which it did but it sounds rough. Almost like it’s misfiring. Sounds like a go cart damn nere. Any ideas on what this could be?

    • @ElectronicMechanic50
      @ElectronicMechanic50  ปีที่แล้ว +1

      More thank likely popped off a vacuum line or blew out a spark plug

  • @JrrrLopez
    @JrrrLopez ปีที่แล้ว

    i have a 95 lincoln towncar is this the same deal for this car and where can i find the 3rd cylinder cuz i have engine code p0303 *cylinder 3 misfire* and wanted to know how can i locate that 3rd one thanks

  • @DavidSmith-fr1uz
    @DavidSmith-fr1uz 2 ปีที่แล้ว +2

    180K? It's not even broken in. Seriously, those engines and cars have been know to last past 500k. However, age does take a toll too.

    • @ElectronicMechanic50
      @ElectronicMechanic50  2 ปีที่แล้ว

      Ohh I know my 87 yo G-pa drives this very short distance and it does alot of idling

    • @jeremysales1232
      @jeremysales1232 ปีที่แล้ว

      Google million mile Vic. With the right maintenance, they go forever.

  • @trainguy1218
    @trainguy1218 ปีที่แล้ว

    HI
    Tried to contact u via email but the link (email shown) didnt work. PLMK alternatives. DDL