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Multiple Misfires

Discussion in 'Cherokee' started by saf, Sep 17, 2017.

  1. Sep 17, 2017 at 12:29 PM
    #1
    saf

    saf [OP] New Member

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    2003 Jeep Grand Cherokee 4.0
    Code gives multiple misfires. Engine light on. When it begins to flash, Engine loses power, I turn it off it will run fine again for a while. Its like it resets even though engine light remains on. Have replaced: spark plugs, coin rail, crankshaft censor and cam shaft sensor. Problem can go months without any issues after a part is replaced. Been dealing with this for about 2 years now. Any Ideas?
     
  2. Sep 17, 2017 at 5:22 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    welcome to the site! I would start with checking the battery cables to make sure they have clean, solid connections.
     
    JKBob 25 likes this.
  3. Sep 17, 2017 at 5:34 PM
    #3
    aggrex

    aggrex Well-Known Member

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    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    Welcome! Two years not two months? What's the code or have the code identified with rented/purchased code reader.
     
    JKBob 25 likes this.
  4. Sep 17, 2017 at 7:15 PM
    #4
    JKBob 25

    JKBob 25 Well-Known Member

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    Welcome to the forum. ^^ what chris4x4 and aggrex said.^^. Good place to start.
     
  5. Sep 18, 2017 at 2:46 PM
    #5
    saf

    saf [OP] New Member

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    We have checked all battery terminals and replaced battery also. And YES 2 YEARS!! :( Code from O'Reilly's is Multiple Misfires.
     
  6. Sep 19, 2017 at 9:04 PM
    #6
    Jeepmechanic2003

    Jeepmechanic2003 Member

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    Stock for now
    Check the body grounds from engine compartment sounds like loose or broken wire
     
  7. Sep 20, 2017 at 9:19 AM
    #7
    Prerunner1982

    Prerunner1982 Well-Known Member

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    Have you replaced the coil packs or spark plugs?
     
  8. Sep 20, 2017 at 9:23 AM
    #8
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Can you give us the actual code?
     
  9. Sep 20, 2017 at 9:30 AM
    #9
    Prerunner1982

    Prerunner1982 Well-Known Member

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    Going to guess p0300.
     
  10. Sep 20, 2017 at 5:01 PM
    #10
    aggrex

    aggrex Well-Known Member

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    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    If Prerunner is correct (P0300) then some DIY things to check might be coil, ignition module, fuel pressure, EGR
     
  11. Sep 21, 2017 at 5:14 AM
    #11
    Prerunner1982

    Prerunner1982 Well-Known Member

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    That's a big IF I know..... :confused:
     
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