SOLVED! Jeep Wrangler Misfire is over - a hard lesson learned

SOLVED! Jeep Wrangler Misfire is over - a hard lesson learned - Can't believe the cause!

Рет қаралды 171,673

4 жыл бұрын

www.Garagecouple.com
Be sure to check out all 4 videos in this series to watch me diagnose this misfire issue:
Episode 1: • Solving a cylinder 3 m...
Episode 2: • Jeep Misfire Diagnosis...
Episode 3: • DIY Jeep Tj Vacuum lea...
Episode 4: • SOLVED! Jeep Wrangler ...
NTK bank 1 sensor 1 - amzn.to/2mEcZfX
NTK bank 1 sensor 2 - amzn.to/2lHYbfV
NTK bank 2 sensor 1 - amzn.to/2nbaXnD
NTK bank 2 sensor 2 - amzn.to/2nenZRt
Autolite xp985 iridium plugs - amzn.to/2lG3xsc
MAP sensor - amzn.to/2mEmWd8
Finally figured out the jeep tj cylinder 3 misfire issue. A hard lesson learned - here is the final video. Glad she is running smoothly now. How this helps others in the future! We checked everything from fuel injectors, to the wiring, to the compression, a leak down test, vacuum test. Many of the parts and testing supplies we purchased either from amazon or rented from local big box stores. We were even thinking this could be a heat soak issue, but the real issue were the spark plugs. So we replaced the plugs with some high quality iridium and this issue is no longer active. Glad to be done with it!

Пікірлер: 163

@vgullotta 4 жыл бұрын

Oh nice! Congrats!!!

@vgullotta 4 жыл бұрын

Don't stress it, these gremlins in older Jeeps are always expensive to find, and it's always something you thought about already lol. The TJ was just acting up cause it wasn't getting all the attention the JKU was getting lol. Enjoy that beautiful Jeep!

@Garagecouple 4 жыл бұрын

I appreciate the kind words! And thanks for your help during the process! Just glad it's over! Lol

@vgullotta 4 жыл бұрын

@@Garagecouple Hell yeah, that sigh of relief at the end when it's all fixed is sooooo satisfying =) Actual real world Jeep problem videos are definitely my favorite! It's like a puzzle we all get to work on with you! Keep up the good work, lovin the channel!

@Garagecouple 4 жыл бұрын

Thank you! I'm glad you enjoy it! If there is anything specific you would like to see just let us know! Cheers 🍻

@falseshepherd6611 Жыл бұрын

You saved me a world of pain brother. I have a new rebuild of my 4.0L, and the store sold me the wrong spark plugs. Jeep ran fine at higher revs, but rough at idle. Gave me a miss-fire code. I replaced the already brand new (wrong) spark plugs with a new set of correct plugs, and all good! Thanks again.

@Garagecouple Жыл бұрын

Amazing. Glad to help! Cheers!

@jamesrodgers6472 2 жыл бұрын

I have a 2001 TJ with the 4.0 L six-cylinder. I had a number three misfire code. Replacing the spark plugs cleared the problem. I’m considering putting the MSD Coil pack rail in just for good measure though.

@mra1957 4 жыл бұрын

Nice Video. I am a career mechanic. That said, in diagnosis always remember that hesitation and miss under load is usually due to a weak ignition. Plugs first, then spark plug wires. We had 4.3 V-6 motors in a lot of our fleet at UPS. After a couple years they started throwing various codes. When tracking it down, we had done spark plugs, cap & rotor, and still had codes throwing. Plug wires looked like new. Guess what, put a set of wires on and the motors ran perfect. Lesson learned. Take care of the basics first.

@Garagecouple 4 жыл бұрын

Thanks for the comment and tips! Agreed and lesson learned. Will always begin with the basics. What's odd is the stuttering improved with rpm.. Which made me think it was a sensor or a clogged cat. Oh well, 6k miles since this video and she's purring!

@curtiswhite7720 2 жыл бұрын

I’ve seen a few of your videos, but this is what made me subscribe. I recently changed my spark plugs to double platinum Bosch plugs on my 4.0L, and it sounded great in the garage. When I took it out, got a cyl 1 misfire. Shortly later, cyl 5 misfire. Not even 100 miles on the new plugs. I thought the spark plugs causes a chain effect of other parts to go wrong. I had my rockauto shopping cart LOADED, but wasn’t 100% confident of it all. I just so happen to still have my old champion plugs, put them back in and it all went away lol. Well, no more Bosch plugs for me. Thanks for the tip, saved me hundreds of dollars and hours of work.

@Garagecouple 2 жыл бұрын

Dang! Glad the video was helpful!

@TXFarmRoad Ай бұрын

Champions are the OEM plug to begin with.... Why would you change ?

@MadDogXJ 4 жыл бұрын

Yay!! Wow what a trip.. Im happy you found the issue. And shared your triumphs🎉🎈🎊🎆

@Garagecouple 4 жыл бұрын

Thank you so much!! I appreciate your comment. Hopefully this helps someone down the line!

@zodiac8208 3 жыл бұрын

I start with the same problem!! Very low idle , stalling, shuts down when stop or when engage clutch at first it do when warm, now when jeep is cold too. I will try with the sparks first! Thanks for all your videos! Really appreciated!

@Garagecouple 3 жыл бұрын

Of course! good luck!

@zodiac8208 3 жыл бұрын

Ok! I think today my saga ends!! New iac, new sparks, and a new vacuum heater line... just in case... and... now its fixed! Thanks bro for your videos, really help me.

@bohuslavhumplik6744 Жыл бұрын

Jeep....Making Mechanics out of Drivers since 1942!

@Garagecouple Жыл бұрын

Lol

@youthbuildersantiaging4250 7 ай бұрын

Yes. We are the lucky ones. No need to take to mechanic just to change oil like new vehicles.

@thehatefull1761 3 жыл бұрын

First time I ever did a tune-up on my 4.0 I went and bought brand new iridium cuz that's what AutoZone said I should use. Ran fine until you get up around four grand and it would start skipping. Took the old spark plug that I just pulled out of them back up there and told him to give me the exact ones which were coppers pulled their Iridiums out put the coppers back in and it ran fine.

@Garagecouple 3 жыл бұрын

Glad to hear your problem was simple. We have had good luck with the iridiums!

@MattBrownbill 4 жыл бұрын

I have just put a set of those iridium plugs in my ZJ, they were recommended as mine is converted to LPG/CNG. Looks like I made a good choice then!

@Garagecouple 4 жыл бұрын

Nice nice! Yes so far they've been awesome!

@erikherring9817 4 жыл бұрын

This misfire code are caused by the Jeep Gods!! They know it will keep us all in constant communication combing through forums and KZfaq videos. It’s bigger than us. 🤣

@Garagecouple 4 жыл бұрын

Hahahahah

@thelonewrangler1008 2 жыл бұрын

I knew it!

@Jeff-wu6wn 4 жыл бұрын

i got the E3 plugs and they are so awsome !!! i noticed a big difference in idle , millage and over all performance well worth the extra few dollars!!

@Garagecouple 4 жыл бұрын

Thanks for sharing!

@DarrylSheather 4 жыл бұрын

Glad you sorted it !

@Garagecouple 4 жыл бұрын

Thank you!

@nickyj3571 2 жыл бұрын

I have the 2.4 TJ. Cant find what the OEM spark plug is. I ordered copper on rock auto NGK hope they work

@frederickdupont5743 3 жыл бұрын

I had the same problem, and I also bought, part after part trying to fix the issue. Searching once again for a solution, i came across this very video. Wham-Bam-Bing-Boom-Bada-Bop, and the problem is fixed. I was using Bosch Platinum before I switched to the same ones in this video. Oh on a totally different note. I am selling six slightly use (2 weeks) Bosch Platinum spark plugs and still in the unoriginal box

@Garagecouple 3 жыл бұрын

Haha Awesome! Glad to help!

@the-bu3lb 2 жыл бұрын

I’m glad it worked out for you. But these new Jeep you have to remove the complete top end just to have access the spark plugs it’s a 4-6 hr job. I still do t even know if it will work.

@RVingTheCountry Жыл бұрын

I know. I’m dreading the job on my 15.

@davidcolasurdo2282 Ай бұрын

Use what it comes with I’ve seen this many times!

@harrydesforges7802 4 ай бұрын

I’m having the exact same issue. Any reasons you didn’t go with Jeep Original parts from a Jeep dealership besides prices?

@rustybritches6747 3 жыл бұрын

Damn, thats a hot plug!

@Garagecouple 3 жыл бұрын

Yep

@sharplessguy 3 жыл бұрын

At 3:57 I paused the video and zoomed in on the top ceramics of your plugs... I have seen arcing before where the coil pack arcs across the top of the plug due to contaminate like carbon or oil/water forms a path for current. At least one of your plugs looked like the ceramic between the coil and the lower metal base was fairly dirty/contaminated....

@sharplessguy 3 жыл бұрын

Carbon tracing between the boot and base of a spark plug m.kzfaq.info/get/bejne/mbyIn5dlm6uco2Q.html

@jamesdodson9417 2 жыл бұрын

Good eye fella

@DJBrearley771 4 жыл бұрын

what year is your TJ? I have a 2000 TJ and am having a cylinder 1 misfire. Started years ago and wouldn't pass smog due to the check engine light so I gave up and bought a new truck. Now I want to get back to my Jeep and get it drive-able.

@Garagecouple 4 жыл бұрын

It's a 2001! I would follow all the steps in the series of videos. Does it have any symptoms?

@reesewalden1547 3 жыл бұрын

Crazy as it my 08 was rough on idle. Misfire cylinder 3. I went to pull cylinder 3 spark plug and it wasn’t tight. Pulled anyway and put back securely in and misfire gone.

@Garagecouple 3 жыл бұрын

Wow nice!@

@jamesray3920 Жыл бұрын

2 year old video but I wish you showed a before then now to see what problems so other may say thats my problem also, on my 05 jeep lj unlimited rubicon 4.0 I installed a sprintex supercharger I've had nothing but problems on tune that came with kit , p0300 is multiple cylinders misfire ,p0129 (/6) barometric out of range, p0129 (4/6) throttle position sensor /switch A circuit high , p0157 02 sensor 2/2 circuit low , I wished I never installed this supercharger and bought a stroke engine , sprintex 3800. Stroker 7,300 if I can't fix this issue in buying a Stroker engine doing a swap I really love the online 6 power/ performance platform easy to work on plus old school last of the real jeeps nothing like it of its glory days

@destroytheilluminati770 2 жыл бұрын

had a 95 jeep wrangler that i had done plugs wires and cap and rotor, shorty after i did that it developed a misfire, being that everything was new tune up wise i started to suspect injector was failing, while running i could pull the connector off and isolate the miss, replaced injector to no avail. so i pulled the plugs to take a look at them and i discovered the porcelain on the plugs were all red (they were ac equivalents of the champions they didnt have at the time) replaced with correct champions, miss went away. AC plugs are junk

@vinceversteeg9959 2 жыл бұрын

AC plugs are fine, but only in GM products. 4.0 Jeer needs Champions.

@Nobamaable 7 ай бұрын

These tractor engines do NOT like iridium plugs... use the recommended OEM plugs and you will be fine.

@Garagecouple 7 ай бұрын

Yup!

@stevebyk8358 4 жыл бұрын

I have the problem on my 03, cylinder 1 and recently was told it was the IACV solenoid ???

@Garagecouple 4 жыл бұрын

Worth swapping it out? Good luck!

@dennismontgomery8290 Ай бұрын

Well I tried this plug change for my 02 TJ 4.0 misfire did not change a thing long story short was the cylinder cracked 0331 problem sold Jeep interesting

@tomhubbard353 2 жыл бұрын

I know this is an old video but... The 4.0 don't like fancy spark plugs IE iridium etc. The forums pretty much all say to just use the good old simple Champion standard plug. They go and go and are cheap. The coil on plug can have connection issues in the connectors. Always!!!!! Check ALL connections before firing the parts cannon LOL... I spent "A LOT" of money on my Duramax to FINALLY find a bad connection in the AC system that was crippling the truck. No NOT the same thing but,,, connections connections connections!

@user-qh1wz3kp4k 5 ай бұрын

I just buy a jeep 1999 and I used your comment that uses champion the regular my idle was terrible man w the champion spark everything change now runs like new thank u

@mannybro1 2 жыл бұрын

Did you had to gap them?

@atomicdmt8763 3 жыл бұрын

there might be quality issues w spark plugs purchased (on Amazon).........I put in new plugs- and later discovered several were CRACKED, badly ** ** **~ might have been fragile prior- and over abit of use the cracks grew.

@Garagecouple 3 жыл бұрын

Ahh man bummer!

@user-qh1wz3kp4k 5 ай бұрын

Hey wooo man muchas gracias dios te bendiga I fix my jeep I just buy it w that issue just change the sparks plug and that it wooo champion spark regular no bronce one

@the-bu3lb 2 жыл бұрын

I have a p0152 code it’s saying o2 sensor. It now it’s shaking and my engine light is flashing. People keep saying it’s the fuel rail it’s only 4 yrs old

@howardbeach8701 2 жыл бұрын

I feel your pain! I bought my 2011 Jeep Rubicon brand new. It's the worst vehicle I've ever owned. By the time it was 3 yrs old, it'd been in the shop probably close to 85 times! Horrible! Full of defects. I still have it and it's been in the shop at least 40 times in the last year. If I thought I could have Jeep CEO Mike Manley killed and get away with it, believe me I would have. Right now it has a P0306 code, Cylinder 4 and 6. I'm trying not to drive until my mechanic gets back. Can't take it to ANY Jeep dealership in Illinois. They're all crooks and thiefs! Good luck!

@rolexseller5120 2 жыл бұрын

Did the issue come back?

@walterlangkowski4723 2 жыл бұрын

If your pistons are smashing the spark plug gaps and won’t rev past 1600 what do you think that could be ?

@TXFarmRoad Ай бұрын

Wrong plugs

@flippinstoop1125 Жыл бұрын

My 2004 jeep wrangler TJ 4.0 runs best with the NGK spark plugs I tried champion and it through code 303

@Garagecouple Жыл бұрын

Nice!

@Garymayo 4 жыл бұрын

You likely corrected the problem by removing and reconnecting the spark plug wires. There could be an issue with them that got a better connection when you put it back on. Next time it happens replace your spark plug wires.

@Garagecouple 4 жыл бұрын

I don't have spark plug wires actually,but I see how that could help others. Thanks for your time!

@charleswright86 4 жыл бұрын

I think someone may have mentioned it, but if you swap out a plug for another, and you still have same problem, your plug wire may be suspect.

@Garagecouple 4 жыл бұрын

Thanks for the helpful tip! Our tj doesn't actually have plug wires, but I agree! We actually solved this issue and it's been over 10,000 miles running strong. Check out the final video in the series! Cheers

@bkpickell Жыл бұрын

My YJ has the opposite problem as yours. It idles and accelerates very smoothly. When I get up to speed and driving at around 2000 RPM it starts missing. Gear doesn't matter. Will not miss in neutral. I've thrown all sorts of parts at it: plugs, wires, coil, cap, roror, distributer, O2 sensors, Throttle body, fuel filter. I'm kind of stuck now.

@jeremyvigil9762 Жыл бұрын

Valves carboned up

@TXFarmRoad Ай бұрын

This 👆🏻 And the tops of your pistons

@harrydesforges7802 4 ай бұрын

BTW, I replaced the original spark plugs with Champion Iridium spark plugs 6 months ago with a new coil pack from Amazon. I was thinking of just going authentic dealership parts. Any advice would help. Mechanic recommended NGK. Any helpf would greatly be appreciated.

@TXFarmRoad Ай бұрын

Champions are the OEM plug , why change brands now ?

@libra3655 2 жыл бұрын

KZfaq mechanic here, but I've got limited experience with other relevant theories. Maybe it's possible it's your ignition rail? New plugs might handle the lower voltages better or the dielectric grease is allowing better continuity of the voltage to the plugs. That's my theory on why it initially migrated with cylinder 3 but went away after replacing.

@bohuslavhumplik6744 Жыл бұрын

I fixed my P0301 issue with by replacing the Ignition Rail a few years back, bought it from AutoZone (yeah I know, Duralast is crap, but they had it in stock at 8pm and she was my daily dricver back then) now five years latter the fault came back. I relaced the plugs, she ran good for a month, code came back, then I replaced the Ignition Rail (Duralast has life time warranty!) and shes runnign like a champ again.

@charleswright86 4 жыл бұрын

Copper anti-sieze might be better then putting vaseline on your plug threads.

@Garagecouple 4 жыл бұрын

This is true. Been using Vaseline for over 20 years and over 400k combined miles with no issues.. Probably the same tub of vaseline too lol! Thanks for the tip! Cheers 🥂

@2goblinsinatrenchcoat 3 жыл бұрын

I have a cylinder 5 misfire, I hope it’s just spark plugs lol

@jameskohler3701 3 жыл бұрын

Runs even better if you do champion copper

@Garagecouple 3 жыл бұрын

True!

@bravobullz7475 3 жыл бұрын

Is the same story for the 3.7 v6 ?

@Garagecouple 3 жыл бұрын

Would have no idea!

@howardbeach8701 2 жыл бұрын

It looks very easy, but could a girl change them? I have a 2011 Rubicon.

@mandytuning 3 жыл бұрын

I dont known why people install bosch plugs.they have been misfiring since they start with the weird no electrode design.its no secret

@Garagecouple 3 жыл бұрын

Good to know!

@mikimiki195 3 жыл бұрын

You done everything but one first thing you should look at first 😕

@Garagecouple 3 жыл бұрын

This is true!

@everettmagbitang1319 4 жыл бұрын

Did this clear the code for you?

@Garagecouple 4 жыл бұрын

Yes it did!

@ChristopherPerryEnt 4 жыл бұрын

Had cylinder 3 misfire in my jk and fixed it

@Garagecouple 4 жыл бұрын

Nice!

@RottieMom14 3 жыл бұрын

How fix? My SRT is in garage now being diagnosed for cyl 3 misfire with P219A code. Mechanic has looked at everything and I’m afraid it’s lifters/cam😩

@wiley0714 2 жыл бұрын

I don't know why you would put in a iridium plug in that year Jeep. Nor a "double platinum. A standard champion would be fine.

@jasonshadron81 4 жыл бұрын

👍🏻

@Garagecouple 4 жыл бұрын

Right on!

@mikeshank3040 7 ай бұрын

Not sure but it sounds like your valves might be rattling

@Garagecouple 7 ай бұрын

Tight valves :)

@TXFarmRoad Ай бұрын

For now on , do a better diagnosis before shooting your parts cannon at it . And save a bunch of money 👍🏻

@philliptaylor5981 4 жыл бұрын

You can hear a knocking noise.

@Garagecouple 4 жыл бұрын

Yes! Fortunately that misfire was resolved with the spark plug :)

@willyx2809 4 жыл бұрын

I have a 2001 Tj 4.0 and I’m giving up 😭 I have p0300, p0303 and p0304

@Garagecouple 4 жыл бұрын

Ahh!start with the plugs

@willyx2809 4 жыл бұрын

I changed spark plugs first, but I bought NGK spark plugs, I don’t know if I should change it for the same ones you have.

@Garagecouple 4 жыл бұрын

I would think they would be fine. Time to replace the coil

@willyx2809 4 жыл бұрын

I changed for the spark plugs you have, I noticed a little more power, but after I accelerate fast like more than 45mph and I do a completely stop. It starts running roughy and Dont go faster than 35mph, I’ve replaced the coil as well.

@jasonb3907 4 жыл бұрын

@@willyx2809 Mannn I have the same exact codes (P0300, P0303, P0304) showing up on my 01' TJ 4.0! Have you resolved any/all of your issues? I'd appreciate any help I can get because I'm not a mechanic whatsoever but I'm damn well going to try my best to become one for a day with the few tools I have! Thanks William and to anybody else willing to help :)

@darylhudson777 3 жыл бұрын

Those Bosch plugs are terrible...short time you got problems like you did.

@Garagecouple 3 жыл бұрын

Agree!

@vinceversteeg9959 2 жыл бұрын

Copper Champions are OEM. Stick with those. Period.

@claudesmoot1880 3 жыл бұрын

Never buy anything Bosch, except a dishwasher.

@Garagecouple 3 жыл бұрын

Solid advice!

@brycebackstrom9587 3 ай бұрын

You installing the wrong spark plugs…. Must be copper… See specs on the firewall in driver side under the hood

@samvish6363 Ай бұрын

Parts Canon its cheaper to have it diagnose by a professional

@jat-justamaturetech-philpj8285 Жыл бұрын

DO NOT PUT THE IRREIDIUM PLUGS. ALWAYS USE COPPER ONES! Factory NGK.

@Garagecouple Жыл бұрын

Yup! We learned the hard way

@thehatefull1761 3 жыл бұрын

You don't put iridium in that jeep you're supposed to put Copper's

@Garagecouple 3 жыл бұрын

False

@thehatefull1761 3 жыл бұрын

@@Garagecouple that ignition system was designed around Copper's

@thehatefull1761 3 жыл бұрын

@@Garagecouple unless you've modified or made upgrades to your ignition system you should always be running coppers

@Garagecouple 3 жыл бұрын

This is a myth. Lots of extensive research +running iridium in our 4.0 for over 200,000 cumulative miles begs otherwise! The element that propagates the spark does not make a difference. Iridium will outlast copper.

@thehatefull1761 3 жыл бұрын

@@Garagecouple say what you want but I got 6 Jeeps. Every single one of them I ever try to put anything--but copper in ran like crap. All 4.0s and 2.5s

@Donnythelatemodeltech 4 жыл бұрын

Lol. Nice video. Nice channel. Sorry to tell you this but, you didn't fix it. The dreaded cylinder 3 misfire isn't fixed with plugs and sensors. Your almost at 1k! Keep up the work.

@Garagecouple 4 жыл бұрын

Thanks for the comment and kind words! Thankfully for us, the misfire is history. All it took was plugs. It's been 5,000 miles and it's purring like new. Cheers! 🍻

@TheMrprez 4 жыл бұрын

Wish I could say the same. Changed plugs to a APP 985 and also the coil rail. Still have 300, 303, 304, 353.

@jasonb3907 4 жыл бұрын

@@TheMrprez Any updates on your Jeep John? I'm having the same codes popping up on my 01' TJ 4.0 now, except for the 353.

@jakefine8049 Жыл бұрын

@@jasonb3907 any updated lol I’m fooked with the same problem