Jeep Cherokee Misfire / Skip / P0300 , P0306
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- Опубліковано 8 вер 2024
- 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.
I had a 2001 cherokee and had to replace the coil twice in a few years. They are known to fail. Dunno why Jeep switched to that for the last two years of the XJ. FYI, for those who have 00-01 models and experience misfires after starting up on a warmed-up engine, it's the notorious heat soak issue. There are some fixes that work and some do not. I vented my hood to allow the heat to escape when it's parked after driving. I also had a relay hooked to the electric fan that enabled it to run a few minutes after shut down to cool the engine bay. This corrected the dreaded heatsoak misfire. Just a heads up.
It just happened to my 01 and I’m no car guy 😭
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!
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.
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
i just did the same thing and i just got the code that cylinder 6 is misfire what else could it be?
I hardly ever comment to videos but Eric O is the most thorough mechanic I ever seen great JOB Only man I seen that takes pride in his work. The small details is what makes a true professional.
Thank you for showing the world that there are legit techs out there mechanics whatever you wanna call him that do care and do the right thing and think about the customer at the same time plus I love your work and on a 2000 Cherokee is that's also what I own
Excellence. Almost could imagine you were working on mine! Same year, color, 250,000 miles, cylinder and troubleshooting dead end after tune up done by previous owner. Had it 3 years now, love my jeep....301 slightly rough idle the last thing to dial in to move onto trustworty 4WD use and a throw a few dollars at cosmetics. Correct, simple and complete explanation....brief too, Subscribed and Thumps Up for sure.
Love those Jeeps and the 4.0l but the coil connector is a giant PITA. Thanks for the video Eric.
had same issue in 99 xj, replaced both o2 sensors, replaced coil, replaced map and crankshaft sensors... the problem ended up being heat soak. I think I have replaced all critical components on xj, should be all good for next owner. Lol
I had this happen to me this morning after heading to work, I will be looking to work on this tonight. Thanks for doing this video and giving good explanation of the procedures you did.
I can give you some info on the low oil pressure. It's the head...if the head has the 0331 casting number on it then it has small hairline cracks between cylinder 3 and 4. In late 99-01 the 0331 head was used and then in 02 a different head was used.
it's always a pleasure to watch your video. I own a shop and I actually watch your videos during lunch hour for fun.
Oh that's cool. Thanks!
just starting watching your videos about a month ago. have to say I love your attitude. with as stressful as this job is and the hours we put into it it's nice to see the chuckles and positive attitude you have. there really are some days I just want to change professions. keep up the awesome videos my man.
Same here man
Eric, firstly, the Jeep hat is critical for this job because it lets the vehicle know that it ain't dealin' with no pedestrian. Secondly, it is a common practice by Jeep DIY'ers and professionals alike to avoid aftermarket electrical components on Jeeps. They report a higher failure rate with aftermarket and claim that OEM (mopar) components reduces "be backs". Your mileage may vary.
Nice work. Love the 4.0L power band but rough idle seems to inherent.
Thanks for making this video. I have a misfire on my 01 Cherokee and now Im sure its a bad CP. You saved me all those diagnostic tests
+John Gluse cool glad it helped
Recently swapped one of these 4.0s out of an xj with 265k. Remember when they had distributors on them? The good old days. Sweet videos man. Good work
My '88 still has a distributor.
My 99 just got a new cap and rotor… 246k.
Great video, I have a 2000 cherokee as well with the exact problem, I verified it was the coil... so I just picked up a good coil at the junk yard for 50$, will be putting it in tomorrow.
Nice video.
Six-pack coils. Probably saves the company 30 seconds when they're putting the engine together, but when it comes time to repair, the customer has to pay for six coils, instead of one.
Garth Goldberg Time is money for them right ?
One hundred bucks for six all new coils makes this engine idiot proof.
Three coils
3 coils (they use one for two cylinders) and replacing them as a block if they have failed isn't a terrible thing. When one goes like this, it's likely the rest are about as worn. So not a big deal, and honestly the price for the thing isn't horrible at all.
The 86 and 87 Grand National were the same way. The module was right under it. Back then this ignition style was quite advanced.
i watch many auto tech videos and i think yours are some of the best !!! very informative and your video skills are great
zoie godwin Thanks :)
Thank you! I never new how easy this fix could be and you showed me what I was missing when trying to fix my Jeep! 5:00
A coil pack. My Wife's 97 Grand Cherokee was a 4.0 L, with wires, cap, rotor, & coil. Easy. Pontiac had a 4 cylinder that used coils on top of plastic with internal connections that sat on the spark plugs at the top of the engine. The misfire was an internal short in the plastic between coils. Lucky only the plastic needed replacing. That was back in the mid 90's we fixed that.
Of course on your spare time, keep up the honest work and videos of your repairs.
Awesome video, Great information... Thanks for the help.. God Bless you ❗✌❗💪❗
He'll be back come inspection time. Thanks for the video.
great job Eric just did a Grand Jeep 8 cyl CPS was out acted like starter drag kept shutting off after crank that did fix the problem ... I never seen coil pack like that though glad you got a fix .... have a great day! ;)
Glad you had a nice easy quick fix. I left work with a sore ass from an 05 tribute p0750. Solenoid functions when commanded, fluid is good, ppppfffffffffff!!!!!!!!! I'm surprised you don't have a custom camouflage SMAR hat. Thanks for the video, looking toward to the next one.
Michael Herbert Dang, get those once in a while that wanna beat you up a little:)
Best mech videos on U TUBE - and from a HONEST mechanic - a VERY RARE combination! You're the best!
Another great informative video. So far I have watched all of your video's. Btw I called you a few weeks ago about my ex's 2009 Chevy Impala. It had that po401 code. Well I did what you recommended and it worked. I replaced the secondary air injection valve and the code went away. Thank you for the help and thank you for the great video's. When I get a chance I will make the drive up from Buffalo and come visit. Take care and thanks again.
Gregory Feeney Nice... I am a good guesser then haha
You keep teasing us with those shirts! Lol. Always nice to have a quick and easy job once in a while.
Jonathan Milbury Soon :)
Nicely done Eric and thanks for bringing us along.
stuzman52 Hey Terry, Thanks for watching :)
There is nothing better than a straight six.
Didn't know the 6 had oil pressure problems, everyone always says how great and reliable they are
I have a 96 5.2 with143k and runs great, oil consumption and smooth as glass
the oil pressure sending unit is prone to fail. I would change that before tearing into the engine
Thanks for showing us how to do it!
Now, roll in bearings, pull the head and get a valve job, ball hone the cylinders and install some sealed power pistons and new cam and lifters only if needed, add timing set, already have new oil pump, in under $500
Will restore compression and maybe some oil pressure will run like new for years easy, keep running rotella, they need it anyway for the cam
Or spend another $1000 and build a 4.6
Stroker is the way to go
Thanks man! Great video! Appreciate you taking the time to share your knowledge
You taught me a ton in just 15 minutes. Thanks man.
Just as a follow up, after I got the coil pack back on I now have the part time light going on/off. And the check engine light flashing on/off. Neither ever happened before I took the coil pack off, would that have anything to do with the electric plug I plugged (by #6) back in? Maybe plugged in wrong? Seems like such a weird light to be getting. Any help is appreciated thanks!
a simple test to determine if the misfire is electronic or mechanical is hooking up a vacuum gauge. pretty quick way to determine what you should be chasing.
good repair well done Mr. ERIC and thanks for sharing.
j georges YW
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.
Half the time time, they ain't very potty trained. Last jeep I had, used to piss oil EVERYWHERE 🤣
I got a ripp mods dodge viper coil pack on my 2000xj, it's the dodge viper style but aftermarket high output. It's got plug wires now so that's exciting lol
South Main Auto Repair, thank you for posting this video. I followed your video and swapped out my ignition coil and 2 weeks later no issues. You helped me out of a tight spot. Only thing, taking out mine was very hard and I actually broke it during removal. I appreciate all you do.
got to love quick and easy after that long hard winter.
super coupe Oh for sure...
Great Video man....pretty straight forward and great explaining along the way. No carrying on about stupid shit. Thanks.
We have a lot of your relations here in Galway,lovely people and great workers.Liked the video.
Tom OConnor Oh really? People with my last name?
Tom, I didn't know you are from Galway, one of the most unforgettably beautiful places I've ever been. The whole of Ireland is amazing.
I just started watching your videos. They are great. Wish you were closer.
Very methodical diagnosis. Well done.
I figured that there was a dead cylinder due to spark because you said that the check engine light was flashing. The check engine light flashes because the catalytic converter is in danger of being destroyed. Raw fuel can overheat a cat and damage it. So if you see a check engine light flashing more likely than not this is the case.
A consistent misfire will always cause a flashing cel light
Awesome video man. I learned a great deal of info to help get rid of this stumbling. Thanks man! 🍺
I love your videos man quite a bit different than a lot of other channels but you never disappoint with a video haha keep up the good videos and proper work
same issue 2000 Jeep Grand Cherokee Misfire only on cylinder 6 changed plugs oil coil and ran injector cleaner.No vaccume leaks.Car runs great for about 100 miles.Engine light flashes at high rpms and then misfires.Compression is all good.Not sure what the issue is haven't replaced or tested the injector yet
Its a good thing how you explain things as you go n your preety dam good at what you do thanks for the info n help
I have a 02 Dakota 3.9l check engine light came on p0306 running rough backfiring/ misfire watched this video I hope it’s the same exact thing on my truck
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
my 97 GCL pulled up P0300,305,306. also codes for the coil, O2 sensor. I replaced NOTHING but the CRANK POSITION SENSOR and all problems were solved. There's a cheap Lil piece of felt on it that erodes over time....
Nice quick diagnosis.
Nice and easy Repair Simple Diag On this one Just a bad Coil good work Eric O was very Entertaining @SouthMainAutoRepairLLC
i just bought a 1998 Jeep grand cherokee 4.0.,it idles rough,but runs smooth as soon as you mash on the gas,it runs smooth,i cleaned and re-gapped spark plugs and distributor,i'm starting to think it's the distributor pick-up coil.
I know this jeep is long gone, but on the 4 liters they have a problem with sludge buildup in the oil galley behind the pressure sensor causing a low reading. Might help you out sometime in the future.
I had this exact same problem. O2 sensor and all
Well done video, thanks for sharing
Good video! Thanks it helped me diagnose a misfire
There is a chance the O2 sensor problem was a result of the misfire, Good fix!
have to say thanks, recieved the sma coffee cup, perfect to hold the java while checking out at your vids , thanks again
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
Well done Eric- Thanks
i always find it funny when people say they have low oil pressure and think replacing the oil pump will fix it.....oil pressure is created from the engine clearances inside the engine..the oil pump is just there to pump oil to the engine for lubrication. great video as always, just though i would throw that in lol .
+Herschel Herndon Yep your right :)
+Earl Guyton please step away from the keyboard go and gather up all your tools throw them in the river and NEVER touch anyone's vehicle again for the love of god
Jeremy Proctor ?
+South Main Auto Repair i was just marveling at Earl Guyton comment everyone (i guess only us mechanics) know crank clearances is everything when it comes to having good oil pressure ruling out the oil isn't pure sludge
On 4.0's 90% of the time we find the cam bearings are wasted...
Love the Jeep vids. 👍
Well done! I think the lucky cap helped on this one :)
***** Oh it sure did... special powers :)
Haha yeah your pretty good at guessing. I am just kidding but seriously you're a great tech and I learn alot from your videos.
Gregory Feeney Educated guessing :)
Jeep grew out of American Motors Company. AMC joined Jeep. AMC went out of business. Then Jeep provailed. AMC was Ford, G.M., and Chrysler combined. Jeep grew away from Army Jeep style to Renegade and Minivans. On Renegades, the diagnostic port is in the engine compartment. On Minivans it's in the passenger compartment on the left side. Cars with deep well plug holes require deep well insert kits.
Actually, AMC was Nash-Kelvinator and Hudson motors combined. It never included Ford, Chrysler or GM, though they used parts from all 3 in their own vehicles. Jeep was always a product line, not a mfr, originally owned by Willys and then passed down through Kaiser, AMC, Chrysler, and now (sadly) Fiat. AMC also spun off AM General around the time they went under, which mainly served military contracts, and still exists today. This is why the HMMV resembles a Jeep in many ways.
Best video out of all 20 i seen! Great job bro!
just a note anytime I need to know the companion cylinder take the firing order put the first half on top of the second half and you will have your companion cylinder.
Robert Young Yep every 720 we have a firing event so with the firing order you can figure it out pretty quick :)
The Buick GN had this same style all in one. The GN community was quite large, and a vendor came up with a stand alone unit to test the coil packs far beyond what was available, and to simulate running the engine under high boost, which will put out all but the best ignition spark. Here's a video of the tester in action. You can see that they all work, but one begins to fail under heavy load. The GN Turbo motor needed everything top notch to perform as it should. ua-cam.com/video/Q6QMhuSVF8Y/v-deo.html
Thank you for the video...helped me with my Saturn ls1. 😄👍
Good video, very helpful. Thanks.
Great Job Buddy I'm doing the same thing
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 !!
Great video. If I can do it you can do it is inspiring. I Replace my PCM based on code but still skipping. Local mechnic thinks its the head gasket. going to see if its coding tomorrow
same thing happened to my 2005 chevy trailblazer 2 coil packs went bad while driving it sucked but it happens replaced them both after reading the codes cuz i knew already going into it that was most likely the problem trailblazers are known for it
Good job Mr. " O ".
This was great, I learned so much! Thanks man.
all jeep and dodge have oil pressure switch problem did he try one . Good job Eric
You don't need to check the dates on Ericsson videos just check the wear on the brim of his hat.
Just the way I like my cylinders, in a line!
Whats telling him he has no oil pressure when it's hot? Without a mechanical gauge it's really just a guessing game.
Another interesting video, thanks
Rick James Lol he has an aftermarket screwed to the dash... he didn't believe OE gauge so installed aftermarket :)
My 99 has 411000 miles no oil pressure problems
Mine is a 98 GC, same engine. No issues with the engine (or anything else) since I bought it brand new. Best vehicle I even had. Very tough and reliable. It still runs and looks like new. Can't say this about my 2010 Tacoma.
That is fantastic, please tell how you do it. Would like my '98 to last.
@@landontesar3070 change the oil at the recommended intervals with high quality synthetic oil, and replace the filter with every oil change. Theres no magic goop you can put in the engine to make it last forever, just doing the maintenance will go a thousand times farther than any oil additive off the shelf at an auto parts store. If you're towing, offroading, or otherwise beating on it a bit more than the average driver, change the oil earlier than necessary. An oil change is under a hundred bucks even with top of the line fluid and filter, an engine is thousands and even more to have it installed. Dont neglect the coolant, transfer case, or differential fluids either, again, relatively cheap and easy to replace fluids at recommended intervals, but very expensive to replace components. Change manual transmission fluid regularly, DO NOT change automatic transmission fluid if it hasn't been done regularly since the vehicle is new, often the goop in the old fluid is what's keeping it all together, just top it off if it gets low.
Short version: do maintenance.
@@alexandersimcox2079 Thanks, Alex. Just bought an old tractor, asked the seller, you change all the fluids? He just sort of looked at me. Hint: (that's a 'No') Oil was the worst I've seen since a toronado diesel, and think the water pump impeller has disintegrated. 5 gallons of 80W-90 is in the future.
Quick and efficient diagnosis. If it's a coilpack and has a companion then why wasn't the companion misfiring? Wouldn't that make it more of a coil on plug setup if it could misfire individually?
***** You could have a crack in the coil and it will take a short-cut through engine block to the other cylinder spark plug. current take the path with less resistance.
***** surprisingly it doesn't always work that way. Scannerdanner has a video on this subject with an explanation. I don't remember which one.
***** these coil packs have a copper ribbon that runs from the coil to the each companion cylinder, the ribbon to one of the cylinder could've shorted and the other would've keep firing
super coupe A ribbon is just asking for trouble no matter how well it's sealed. Even though the whole rail looks really neat and easy to work with I'm not a fan of the design if there's a ribbon. Round wires can help contain oxidation to outside layer in the even of a crack in the housing. A ribbon has a flat surface area that will corrode away pretty quick. Great info thank you for sharing that.
As the owner of a 2000, 1998, and 2001 Jeep Cherokee and previous owner of several other Chrysler vehicles, I have never once put those stupid red locks back in any harness connector other than the fuel pump.
Thank you for posting !
I had a 04 Chevy Silverado to diagnosis coolant sensor circuit high sensor was broken at connector on sensor side have to love road salt
Christopher Barone Ahhh salt, it's a thing of beauty :)
I keep forgetting to give you the thumbs up but I remember this time
ok listen up I used to panic when my oil pressure in my 92 Cherokee dropped to around 20 from 40 psi tried Rislan, (still put it in can't hurt) thought it a jeep 4.0 L thing. years later got a 01 Cherokee. With the infamous 4.0L in it what can I say I like those things and guess what it does the same thing, changed the oil sending unit Rislan again, decided to consult the OWNERS MANUAL when I got one light bulb time. the pointer indicates engine oil pressure this gage does not indicate level readings are 20-60 in city driving and 45-60 at highway speeds, pressure varies with speed temp and oil viscosity, hot engine idle pressure of 13 psi is fine constant lower readings like accelerating and your pressure doesn't move above lower reading than you have problems but if it rises to the higher reading your fine, the last part is my own words cause that seems to be a Jeep 4.0L quark I'm not saying ignore it but keep an eyeball on it and you should be fine
I wonder why american manufacturers started with kind of coil near plug ignition. Glad they finally went with coil on plug though. I used to own a 94 bmw 325i that already had coil on plug.
Partially a slow transition from OHV to OHC cylinder head design, and maybe a need to just get a working system that would make it through emissions warranty without dealer service expenses. I'd guess Bosch might've developed the coil-on-plug design in conjunction with German auto makers, as my early 90s Asian and US stuff all had distributors, or plug wires to remote coils. GM cam in block LS engines are still using coil near plug and stubby wires.
I'm using Dura lube for transmission fluid. Then I added a bottle of Rislone engine condition/cleaner.
I have never seen a coil pack like that. I bet it is expensive.
My '88 Jeep has one coil and a classic distributor.
you were right it's got coil packs it still got water in there .
Actually injector driver or injector wiring could still be a concern even if noid light flashes since element takes so little amperage to light up. I had an open in the injector wiring but it had enough of a carbon track to cause the niod light to flash but would not carry enough AMPs to fire the injector. oh oxy sensor is do to the misfire most likely customer called it not to replace. Also some dielectric grease on the coil to spark plus connector is a must on these or intermittant missfire will occur in the we mornin hours do to moisture.
That used to be Martin Yan's hook at the end of his cooking show - "If Yan can cook, so can you!"
hoppes9 Oh nice haha
i love the XJ
Thanks Michael... But I drive a Toyota, My OBD 2 reader works good I guess, never tried the OBD1, I get some info off the OBD2 but since I don't have a as they say
"DEALER LEVEL" scan tool I just have to use my noggin and get er done.
Charles Miller You just have to think like a dealer then your saying?
Well.... I have to think like a "Dealer Level Scan Tool". So many videos I watch, the person is talking about their dealer level scan tool, "esp.. The guy with the sunglasses" :)And I have the newest Intel Processor installed in my brain.My 82 280 ZXT has a computer and no way to read codes at all, no Obd1 or Obd2 and no flashing lights to give you codes, your in the dark. But I figure it out, one bad ass running car. Your comments are really fun, back to trying to get the 350 starter working in the boat, problem is it was working, then I messed with it now it doesn't work. ?
Oh yeah I have fixed a few minus the scan tool haha, just a few ;) as far as your boat sounds like a classic case of if it aint broke don't fix it... man what did ya do to it!?
South Main Auto Repair was the starter relay, I removed it cause I didn't know what it did......So now I'm a expert on starter relays ..Its such a long run to the starter from the key it could not carry the current, I found out that's what that relay thing is for!!. So now I know, I'm going to use relays for a lot of the 12 volt items in the back of the boat, bilge pumps, Trim tabs, etc. Yea started right up, love the sound of a older 350. Now to try and run gas thru the tank that we cant remove and we don't know if there's crud in it, guess we put some see thru filter before it hit the water , oil, separator filter and see if it loads up with junk. Just finished power sanding a teak swim deck off the back of the boat. its 3 1/2 by 10 foot, don't know which way to go, teak oil, or varnish, decisions. Its a 27 foot Sport-craft boat, 1983 vintage, in real good shape, basically a fishing boat with a large clear area to fish from, kind of like a lobster boat, as I've been told. We will be taking it around 100 miles into the Gulf. Its got all the high end electronics, radar, Gps, Large screen fish finders, Ship to shore radio. Think we going to call it the " 2 Large ", cause that's what we paid for it. So tomorrow is Monday, everyone will be headed to work, (except me) :)
Well after reading all of that even I need a nap lol. Sounds like fun going out on the ocean, heck i just mowed my yard for the very 1st time yesterday lol. Well glad to hear you got it fixed with out having the dealer level scan tool :D
Could be heat soak issue. Check the forums. I had this issue.