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Come along on a fast and speedy diagnosis and repair of this 2000 Jeep Cherokee Classic with a 4.0 6cyl that has a single cylinder misfire and a check engine light on. Refer to your shop manual for the proper repair procedures.

50 thoughts on “Jeep cherokee misfire / skip / p0300 , p0306”
  1. Avataaar/Circle Created with python_avatars Warren Lee says:

    Good job!

  2. Avataaar/Circle Created with python_avatars Greg F says:

    Okay, I have been a mechanic for 0ver 30yrs.
    I have watched some of your videos, and, would bring things to you for repair.
    Anyone can plug a scanner in and see the codes, then start replacing parts to no end but, you double check your self and the tools you use.
    Whenever I am going to replace an expensive part, I will check several different ways to make sure that is the bad part, so as to not be a parts changer.
    Good job!
    Your a great mechanic!

  3. Avataaar/Circle Created with python_avatars Antonio Claudio Michael says:

    Nice and easy Repair Simple Diag On this one Just a bad Coil good work Eric O was very Entertaining @SouthMainAutoRepairLLC

  4. Avataaar/Circle Created with python_avatars ssetzer75 says:

    I am on my 3Rd set of replacement coil packs, failing on 6 everytime after a relatively short amount of time. 130k total miles. The original lost 5 and 6. I am searching to see if it is caused by something else.

  5. Avataaar/Circle Created with python_avatars David Bates says:

    Hi, I have a 2002 Jeep Grand Cherokee, I installed a New 4.0 after the #6 piston came apart, drove it for a month, No codes. Now have codes PO300, PO302, PO304, this tells me cylinder 2, and 4 are misfiring. I replaced the plugs (gap 0.35) and a new coil. Drove it 2 days and the codes came back, but now it is cylinder 1 through 5 misfiring. It also has a o2 sensor code PO138 Circuit High and PO141 Heater Performance, both on sensor 1 bank 2. This is the only vehicle we have. Can you help?

  6. Avataaar/Circle Created with python_avatars Richard clinton jones Jones says:

    My 2001 xj has always carried 50 psi but i use a mechanical gauge the original gauge says 10 psi i installed a brass tee at the oil sender you cant pay attention to the jeeps factory gauge it takes less than one hour to install a mechanical gauge

  7. Avataaar/Circle Created with python_avatars CashFlowWithAj says:

    Thanks man

  8. Avataaar/Circle Created with python_avatars mark gabello says:

    And that code 340 is that a cam position sensor

  9. Avataaar/Circle Created with python_avatars mark gabello says:

    Hi I have an 01 Jeep Grand Cherokee with a 6 cylinder I have a code 340 spark plugs River chain supposedly the guy took a 2-2 get this thing running right change it but I really don't know is it a hard job to take the spark plugs out

  10. Avataaar/Circle Created with python_avatars Rusted Rocker Garage says:

    i love the XJ

  11. Avataaar/Circle Created with python_avatars Terry Hesticles says:

    Soooooo much wrong in this video……

  12. Avataaar/Circle Created with python_avatars Everett Harwood says:

    The most information in a nutshell…!!!! And Polish…. No joke..!!!!!!

  13. Avataaar/Circle Created with python_avatars JJK 1 says:

    Thanks for the video Mr. O! It's still helping people after several years. Polish engineering at its finest!

    I just replaced the coil rail in my 04 grand cherokee 4.0 with 230,000 mi
    I was getting a slight miss at idle that got worse over weeks and finally threw p0306. Plugs only had 6,000 miles on them but, number 6 had hairline cracks in the porcelain (which I think were caused by a bad coil). Replacing that plug made it better at idle but it still had a miss and was knocking when giving it gas while driving.
    While I wasn't 100 % sure it was the coils, I replaced the coil rail along with new plugs and now it seems to be good

  14. Avataaar/Circle Created with python_avatars Joshua S says:

    Damn it took me a second to figure out what the hell he was doing😂 I only have one coil and a distributor😂

  15. Avataaar/Circle Created with python_avatars Billy Longley says:

    I like the RIpp coil pack conversion kit for 2000- 01 Cherokee it’s a high performance kit that is awesome “ it’s around 300 bucks

  16. Avataaar/Circle Created with python_avatars Martin Hamberger says:

    I keep forgetting to give you the thumbs up but I remember this time

  17. Avataaar/Circle Created with python_avatars Tom Beilman says:

    At least it’s not Chinese

  18. Avataaar/Circle Created with python_avatars M C Anderson says:

    I had that 'Six" in a Grand Cherokee (1996) with the 'low oil pressure'. Replaced the oil pressure sender and oil pressure was good as new.

  19. Avataaar/Circle Created with python_avatars Spinonemaster says:

    The Jeep 4.0 is notorious for fouling the oil sensor … then people replace with cheap chinese one that fail even faster … buy the good OEM or OMIX ones … and or check with a good quality external gauge …. I've got over 550 K miles on 2 of these cherokees … that 4.0 is a solid engine … it also helps to upgrade to a 4 hole injector as they have the old chrysler 1 hole unit … bosch rebuilds are good (stay away from the cheap chinese ones) the bosch rebuild are 60 bucks, most have a lifetime warranty

  20. Avataaar/Circle Created with python_avatars FAUSTO GONZALEZ says:

    Thanks Eric great job !! Is it possible the paired cylinder with the #6 coil is still operable and not creating a misfire for the paired cylinder. Was it possible to do a OHM coil reading on the #6 and compare with others for a confirmation ? Thanks again, great video !!

  21. Avataaar/Circle Created with python_avatars Ray Proctor says:

    Thanks man! Great video! Appreciate you taking the time to share your knowledge

  22. Avataaar/Circle Created with python_avatars Just_A_Catholic_Dad says:

    I got the same code on my 02 liberty and it has a tapping sound when idling and after it runs a few minutes start getting a little whitish smoke coming from the engine bay. What do you think that is?

  23. Avataaar/Circle Created with python_avatars Doug Kubash says:

    There is a chance the O2 sensor problem was a result of the misfire, Good fix!

  24. Avataaar/Circle Created with python_avatars tyci tyci says:

    Pozdrowienia z Polski

  25. Avataaar/Circle Created with python_avatars RI Aviation says:

    Those Jeep XJ 97 up oil pressure gauges are inaccurate sometimes & read low or drop off. I replace the sender no improvement. I found I had perfect oil pressure when I put a mechanical oil pressure gauge on my Jeep. About 15 lbs difference.

  26. Avataaar/Circle Created with python_avatars ANGELO Marban says:

    Awesome video, Great information… Thanks for the help.. God Bless you ❗✌❗💪❗

  27. Avataaar/Circle Created with python_avatars Frank Perino says:

    hard to C

  28. Avataaar/Circle Created with python_avatars Frank Perino says:

    Crankshaft positioning sensor worn out misfire 1 and 6

  29. Avataaar/Circle Created with python_avatars Frank Perino says:

    Crankshaft positioning sensor worn out 1 misfire 1 and 6

  30. Avataaar/Circle Created with python_avatars Captain Jazzbo says:

    Thank you for the video…helped me with my Saturn ls1. 😄👍

  31. Avataaar/Circle Created with python_avatars Scott Duffy says:

    The 1st thing you should have done with check the fuel pressure it's the fuel pump trust me

  32. Avataaar/Circle Created with python_avatars MrJoey1570 says:

    K Suspension Viper mod….your welcome

  33. Avataaar/Circle Created with python_avatars Jarrod Durant says:

    Love the video see this what I need a mechanic like you I trust u just watching this video I have blinking check engine gas smell going through my Exhaust I'm lost I smell gas on driver side not valve cover passenger side seems ok I haven't inspected anything I have to watch videos learn step at a time

  34. Avataaar/Circle Created with python_avatars Paublus Americanus AMERICANUS says:

    You know Eric you are one of the smartest troubleshooters I have watched. Usually I can be way ahead of a lot of mechs. But proving you are Polish was loosing your license one day before you got it back, burning the tires off with Dad's car. When I was a teen I broke the pickup transmission doing very similar stunts and he made me put another transmission for punishment. Taught me a bit and probably easier for me than him in his 50's.

  35. Avataaar/Circle Created with python_avatars Shane Harrison says:

    Didnt know they switched to those kind of coils all the ones I had all had plugs and wires and distributors

  36. Avataaar/Circle Created with python_avatars 8avexp says:

    My '88 Jeep has one coil and a classic distributor.

  37. Avataaar/Circle Created with python_avatars Pedro Arroyo says:

    My jeep due the same misfire 1999 jeep cherokee

  38. Avataaar/Circle Created with python_avatars Joe Jacovino says:

    have to say thanks, recieved the sma coffee cup, perfect to hold the java while checking out at your vids , thanks again

  39. Avataaar/Circle Created with python_avatars Mondyu Garvoye says:

    I have a 2015 Jeep cherokee, misfire on cylinder #2. My uncle replaced the Spark plugs and the coil and there's still a misfire on #2. What could be the problem sir?