Jeep Wrangler needs Major Engine Work at only 40,000 miles! | 3.6 Pentastar Issue

I had this Jeep Wrangler Sport come into the shop this week for a check engine light. I pulled the code with my scanner and it was P0302 Cylinder 2 misfire.
The customer had taken this jeep to another shop previously and paid to have a tune-up done (new coil packs, new spark plugs). And still wound up with the same misfire code. In this video, I explore other possible issues and I'm surprised by what I found. Especially because this jeep is only 3 years old with about 40,000 miles!
Tools In The VIdeo:
Compression Gauge - amzn.to/3dHyl4C (I had this one before)
Ratchet Set - amzn.to/3sek4QO (Has spark plug sockets)
Impact Socket Set - amzn.to/3aLjfsD (I've had this for 5 years, still works great!)
Electric 3/8 Ratchet - amzn.to/3slVRYW (Affordable Option)
Electric 3/8 Ratchet - amzn.to/3aLYVr3 (Milwaukee)
Scan Tool -amzn.to/3bw7KVj
Tool Tray - amzn.to/2P6c469
Magnetic Work Light - amzn.to/3aMPVSI
Torque Wrench - amzn.to/2ZLdFjK
Keyword Tags :
compression test p0303 p0305 pentastar v6 #jeepwrangler #3.6pentastar #p0302 #p0300
#alexthecardoctor #autorepairguys #autovlog #dodge #chrysler #autorepair #automotive

[@oldgiapetto]

A week ago today I bought a 2015 Wrangler....and the engine light came on fifty feet from the dealer.....So, I had O'Reilly Auto Parts put the gauge on it....Cyl 2 misfire. The dealer took it back and had all new plugs and spark coils installed ( at his expense)....and the mechanic said there was no change and that the engine had serious internal damage. Apparently just like this one. The dealer, an honest man, came to my house that night and brought all my money back!! So, it was a good day....I owned a Jeep for a day, learned a lot about Jeeps and met an honest man. Thanks for your video, great stuff.

[@AlexTheCarDoctor]

Thanks buddy.wow that’s unheard of, what an amazing story

[@jeepfan75]

wow good deal. not that many honest people left in the world now.

[@meganbradley6187]

I have a 2013 with 67,000 miles. I just got a PO300 and PO339. I love my Jeep but this is irritating. I have replaced the starter at 27,000 and the thermostat at 55,000. I wish these were more reliable. Thanks for this video.

[@AlexTheCarDoctor]

Dang that is irritating good luck buddy. Thanks for watching and your support

[@reelnative01]

That head from the factory has a 150k 10yr warranty because they have a major prob with the drivers side head so I’m sure it’s under warranty

[@AlexTheCarDoctor]

They took it to the dealership and the dealership took care of it

[@banginsteel4978]

Good job, very thorough, easy to follow!

[@randallmeacham4655]

I get it, I have a 17 JKU that had a timing chain failure that caused a catastrophic failure and had to replace the engine at 57,000 miles.

[@gdmofo]

Coworker of mine has one of those 3.6 nothing but problems I have an old Ford truck it's a 91 F150 the engine has never been overhauled it has been well-maintained 380000 MI still going strong I'll keep my underpowered 300 cubic inch inline 6

[@redwolf979]

It's an mini van engine. Chrysler is notorious for under powering Jeep wrangler! They probably think the low gearing makes up for the bad engines. What makes a wrangler a Wrangler or a Willies is the low gearing and the slower than normal prototype engineering. Most companies Chrysler included have a 4 year prototype year Jeep tries not to change anything for about 6 to 7 years and then only a little bit. Like the body lines. It's 10,000 dollars just to change the body lines of course that is by 1999 prices so it probably went up.

[@renj6531]

6:26 that looks like the same type of airfilter toyota uses

[@robertalexander7782]

I got a 2021 jeep gladiator. Bought it new. I was not aware of a procedure in place to break it in, common sense , I avoided hard take off, let it run at least 30 sec if was a cold start and I changed the oil every 2000 miles til I hit 15 thousand miles. I use royal 🟣 oil and wix filters. I discovered something interesting by chance. One particular oil change my parts store didn't have the synthetic oil filter. They did have the same filter but for conventional oil. I got that one. On my digital oil pressure gauge, noticed the pressure readout was much more responsive in relation to the acceleration with this filter. I translate that to better oil flow. That's my guess. I felt if the oil is changed on a regular basis that increased flow is worth using this other filter. I put 50,000 miles on my gladiator in about 49 weeks. Not quite a year. It runs just like the day I bought it. No tics, no change in how loud, smooth as silk.

[@calbob750]

With only 40K miles he should have taken it to a Jeep dealer first…warranty? My 2014 Chrysler T&C has 134K miles. CEL light came on. Rough idle. Went to the dealer the next day.PO 302 code. Cylinder head replacement $3000. Number 2 cylinder 100 psi. Failed leak down test. Because I’ve owned Chryslers before I bought it new with the Maximum Care Lifetime warranty. Only up to $6500 in warranty repairs since new. Believe it or not! Had to return the T&C back to the dealer for the same problem last Monday. Service advisor says the minivan might be ready this Monday! That Chrysler Lifetime Maximum Warranty was the smart purchase in 2014.

[@AlexTheCarDoctor]

Yeah, that’s what I told him to do and he did. And the dealer fixed it for them.

[@edilbertolopezgonzalez9456]

At the end of the day, what was the problem with the engine ?

[@AlexTheCarDoctor]

Needed a cylinder head. Luckily for them it was under warranty and the dealership replaced it for them for free. I’ve seen many cases like that.

[@rubberstump]

Cant cover intake when doing compression test and hes being careful .

[@AlexTheCarDoctor]

Thanks buddy very good observation. Thanks for the support as well

[@vianad9285]

It’s a hit or miss I personally wouldn’t gamble my hard earned money on any jeep brand.

[@alexsantana5377]

I got a 2017 Jeep Wrangler and I do live in Phoenix and it started overheating but didn’t reach to the max and I changed every component on cooling system thermostat, radiator, hoses, water pump, overflow tank and even radiator cap. When we run the Jeep it flows the coolant to the overflow tank causing it to have not enough coolant in radiator and then it heats up. Next step is to do compression check maybe warped head or head gasket?? Also check engine light doesn’t come on ??? I’m lost and the air was bled from system too.

[@AlexTheCarDoctor]

Hello, are the cooling fan coming on

[@alexsantana5377]

Yes sir they are

[@AlexTheCarDoctor]

You can perform a block test to make sure the cylinder head gasket is good, you have replaced just about everything in your cooling system.my guess if it passes the block test you still may have air in the system, are you familiar with performing a block test

[@N4UPD]

Might want to check your heater core. They are known to get clogged up.

[@oiygfdxssfgg]

You seem like a really nice guy.

[@jess...b..1894]

Alex could a failed rocker arm or lifter give it a misfire or low compression also..?????

[@4Runner21]

What direction did the customer end up going in this case? What was the outcome? Awesome vid!

[@AlexTheCarDoctor]

They took it back to the dealership and they replaced it under warranty!

[@chiefjoseph8154]

Horrible engine, mine self destructed @ 81,000. Never missed service! Run, run fast.

[@AlexTheCarDoctor]

That’s crazy!!!! Sorry that happened!

[@g.fortin3228]

Thought these had a 60k powertrain warranty ?? Wow 40k thats terrible. I wonder if the idea of poor break-in is the culprit here or if it's just a quality control issue with Chrysler. I'd like to know whats the final diag on it.

[@AlexTheCarDoctor]

I convinced him to take it to the dealership and the dealership took care of them free of charge,Bad cylinder head also I thought the same thing wasn’t broken in properly

[@TheDirtCreature]

This is a design and manufacturing problem. Period. This came from the dealership that replaced the driver's side head at 80,000 miles. My 2014 was babied from the second it came off the lot. Oil changed with premium oil every 3-4,000 miles. All scheduled maintenance performed, etc.

[@Kyle-nq5si]

What do you think about buying a 2015 chrysler 200s 3.6 with 15k miles. I usually work on my own vehicles have for years so I can handle more repairs that are not too extensive.

[@jeffdurling100]

So let me ask, honestly how reliable do you think this engine is? What is the Jeep was used to deliver rural mail with 200k on it. Has an extensive service history with no major problems reported.

[@AlexTheCarDoctor]

My saying is this if you take care of your engine it will take care of you but to answer your question the engine do require a little bit more maintenance than others. Would I own a 3.6 Pinter star no but I’m not knocking they are good engines

[@jeffdurling100]

@@AlexTheCarDoctor fair reply. I am also looking at a older Jeep with the 4.0 was just over 100k on it. Also has extensive service records. I have had both engines and the understand about the 3.6. Had it in a Grand Cherokee and with the 6-speed it was pretty terrible. Drove it with the 8 and much better. Anyway, I am not in a hurry and thanks for the response. I may go take another look at the older Jeep with the 4.0.

[@AlexTheCarDoctor]

All I have to say about the 4 liter is they stopped making it because it was too good was not breaking enough so they wasn’t making any money LOL

[@disorderlymovement]

@@jeffdurling100 I just came across this video but know it is over a year old. I hope you've found the right Jeep for you by now. I own both a 95 Cherokee with the 4L and a 2016 JKU Wrangler with the 3.6L. My Cherokee has 295k (mostly) trouble-free miles on it. My 2016 has only 40k. I've done more work on my 2016 in just those 40k than I did in the entirety of my 1995! Not all have been motor issues. Things like speed sensors going out, ignition module failing. I just replaced the plastic oil cooler on my 2016 as it blew up prematurely. I'm on my 5th Jeep in this lifetime and I'll say that I'm about done with them. Think I'm moving to Toyota from this point forward. Good luck in your search and if it's a 3.6L, buy good tools and be ready to patiently spend Saturdays working on your rig!

[@OffTheBeatenPath_]

@@disorderlymovement Yeah just about every component breaks on Jeeps. I've got a '12 wrangler with 275,000 km. No engine work, but I have replaced the oil cooler.

[@eliseonegrin]

This car is still under warranty, why not let the dealer fix it ?

[@AlexTheCarDoctor]

They did after I diagnosed it I told my customer to take it to the dealership

[@davidlampe4153]

Jeep was a good name years ago but this Stellantis-Fiat engine is not very good. 40,000 miles and put the engine in the trash?! I’ve heard about planned obsolescence but this is just poorly done quality control. What do jeeps cost $50,000 or more? The worst thing is wasting your money on repairs on a new car!

[@Fireal4632]

that thing is running like a top, he already knew what was wrong

[@Jumpwingz]

Great video sir. I have a dilemma that you may be able to provide guidance on. 12’ JKU (114k miles) son did cold start before school and was idling during a cold morning the other day. Engine started stuttering and puffing white smoke and then died. Jeep would not start back up afterward, cranks but won’t run. Threw a code for oil pressure sensor, so I replaced it after I disassembled upper intake and lower intake manifolds. I also changed the spark plugs while in there, since they were through. Still won’t start but it sounds like it wants to. Fuel pump makes buzz noise when key is turned on so I don’t think it is bad. Do you think maybe fuel filters are plugged? Or could it be something else? Battery is good also, and fuel in tank is fresh. Any guidance would really be appreciated!

[@AlexTheCarDoctor]

Hey buddy sorry to hear the bad news buddy.start by checking the engine compression with a engine compression gauge and make sure you have spark

[@Jumpwingz]

@@AlexTheCarDoctor thanks for the quick response. I will have to go buy that gauge, as I really don’t work on vehicles except for basic aftermarket upgrades, and general maintenance. I will keep you posted. Thanks for all the great videos and guidance Alex! Daniel Aiken SC

[@AlexTheCarDoctor]

@@Jumpwingz my pleasure buddy

[@slocavky]

Those 3.6's don't they have issues with the rockers?

[@AlexTheCarDoctor]

Yes! I’ve done a few videos on it lol but they seem to have corrected the issue with the newer ones 2020 and up. Time will tell though.

[@tpangle85]

I will never own another Jeep product after having the 3.6. it is the biggest piece of crap to roll off an assembly line.

[@rigobertosantana9702]

Hi Alex! I watch..u video.. I was planning 2buy a Jeep Wrangler 2018…but I had been hearing that they r very bad cars.. Now ,I’m not sure 2buy.. My cuestión is ,are all the Jeep’s wrangler ara bad? 🙏

[@AlexTheCarDoctor]

Hey there it’s not really about the vehicle it’s all about the drivetrain, The wrangler comes in different engine sizes a four-cylinder gasoline a four-cylinder diesel and the 3.6 pintastar in the late models in the early models the wranglers came in a four-cylinder gas in-line six which is the best engine in my opinion and the 3.8 V6 which is another good engine depending on what year you’re looking at which I think the later models 2018 I will try to find a four-cylinder it’s easier to maintain or the diesel which is great on fuel up to 30 mpg I’ve heard. now the most common engine of Chrysler products is the pentastar 3.6 which is not a bad engine you just have to take care of certain problematic like changing out the plastic oil cooler for the aluminum one and using full synthetic oil which I think you should use anyway in any newer vehicle

[@AlexTheCarDoctor]

I’m a big Jeep wrangler fan by the way my jeep of choice is the new 4xE great power great fuel economy or if I go for the older model it would be the in-line 6 cylinder 4 L

[@rigobertosantana9702]

@@AlexTheCarDoctor thank u so much!!🙏

[@AlexTheCarDoctor]

@@rigobertosantana9702 my pleasure

[@mikegordon3436]

so what was the follow up on this jeep ?

[@AlexTheCarDoctor]

They got it repaired under warranty

[@mikegordon3436]

@@AlexTheCarDoctor was the motor bad? Thought it was out of warranty

[@AlexTheCarDoctor]

@@mikegordon3436 i do believe it was a bad cylinder head. I seen the Jeep recently and it sounded great

[@tuesdayskelton9233]

Do you know what the warranty is on these vehicles?

[@AlexTheCarDoctor]

@@tuesdayskelton9233 it depends on year and mileage

[@nickysindora6952]

Yeah jeep replaced the head on my jeep wrangler 5k miles late the engine went never going to buy a new jeep again 6k Jasper engine

[@AlexTheCarDoctor]

Sheesh. Yeah the new Jeep isn’t for week pockets.

[@nickysindora6952]

@@AlexTheCarDoctor I'll stick with the 4.0 jeep xj

[@AlexTheCarDoctor]

@@nickysindora6952 the engine was so good they stop producing it they claim it was not Emission compatible yeah, right

[@nickysindora6952]

I have a 98 jeep Cherokee XJ also just turned 250k runs like it's brand new I tow my 16 ft center console boat with it to the down the shore in jersey like a half hour ride from me it has a lot of torque

[@AlexTheCarDoctor]

@@nickysindora6952 and a lot of life left in it

[@paulspinosa1679]

I'm a professional, mechanic of sorts (electrician.) I hate bad butcher type work... I'm glad to see that you you care. That's a good mechanic.

[@AlexTheCarDoctor]

Thanks brother

[@jpdriver1967]

3.6 pentastar has a recall for cylinder #2 misfire. It is only taken care of if the owner goes to the dealer with the problem. Not all pentastars get this issue. The estimate is about 1% of all units built will have this problem develop. It was a major problem through 2014, but is a known problem through 2018 and a class action lawsuit has been filed. Chrysler will take care of it for customers who are persistent. The heads are manufactured with sand castings and if the heads are not properly cleaned before installation during the manufacturing process, this is a result. If I were the customer, I would demand Chrysler reimburse for all repair costs.

[@michaelcronin5225]

Is there a recall for cylinder 1 misfire too for 2015?

[@jpdriver1967]

@@michaelcronin5225 Only way to know for sure is a trip to the dealer. The people on @EpicFmilyRoadtrip just had a cylinder 1 misfire on their 2020 JL. It all comes down to the way the heads are cast and if the manufacturer got all the residue out of the heads before assembly. #2 and #3 are both covered by recall if it is determined to be the head. I had a new head installed at manufacturer expense for a #3 misfire.

[@michaelcronin5225]

@@jpdriver1967 thanks. Just dreading hassle and the expensive repair. Sounds like $3k or more

[@sidneythomas4174]

😊

[@queensapphire7717]

They all pretty much have the oil filter housing problem, that fails, mine did at 42K miles. It’s a $1000 fix.

[@MaryLaties]

30 years ago that would have had a bulletproof straight 6. How far we have come.

[@LewdSilhouettes]

Man…world needs mechanics like you. Youre the real deal.

[@AlexTheCarDoctor]

Thanks for the kind words man,I’m just out here trying to make a difference

[@onebridge7231]

A good trustworthy mechanic is worth their weight in gold. So few are honest or do good quality.

[@bstrutton]

That's some solid diagnostic skill right there. Damn good job diagnosing and teaching! Most folks these days couldn't troubleshoot their way out of a wet paper bag...

[@luisangel-fe8hy]

Great video Alex! I didn’t know how the cylinders were numbered and you did a great job explaining that. Thank you for your help and you gained a new subscriber

[@AlexTheCarDoctor]

Thanks for the support buddy. I’m glad you enjoyed my video

[@mtoddvan]

Common failure is the rocker arm bearings on 3.6. Millage isn't relevant or year model. It's known manufacturer defect. Really luck of draw if happens & it can chew up the cam shaft lobe. Doubt it's the VCC or it would effect all cylinders on same side of engine.

[@AlexTheCarDoctor]

I just witnessed that on a Ram pro master with low mileage

[@kentearly805]

Cylinder # 2 exhaust valves not seating properly or burning have been a regular problem on pentastars from the beginning. Put # 2 at tdc compression and blow a little shop air in plug hole with a latex glove on the tailpipe. Glove inflates letting you know for sure it's the exhaust valves not seating.

[@AlexTheCarDoctor]

That was gonna be the next step but the customer didn’t want to pay for further diagnostics

[@seahorse5677]

@@AlexTheCarDoctor lol you charged for that?

[@AlexTheCarDoctor]

@@seahorse5677 unfortunately I have to.my shop rent at the time was 2500$ plus light and water a month I don’t think you want to now lol

[@jacobdykes6736]

You said at that time it was 2500 how did you get it lower

[@AlexTheCarDoctor]

@@jacobdykes6736 5000$

[@abdulsaber1085]

That co worker of yours giving you the battery is prime example of someone you want in the shop. You aint even have to LOOK at him and he knows to help.

[@braydinjones6301]

Great job man! I can tell you take lots of pride in your work. Simple and straight to the point as well. 👍👍💪💪💪

[@AlexTheCarDoctor]

Thanks brother.I put my all in my work

[@user-kw5ze5ky5q]

I can tell you’ve worked on a few of these 3.6s. You’re absolutely right about not using power tools on the intake manifold. I’ve cracked a few of them over the years just tightening them with a 1/4 ratchet and torqued to the minimum torque spec. Other than that the pentastar engine is a great engine despite their early production flaws. As opposed to the dreaded GM 3.6, which needs a timing chan kit every oil change. I’ve seen plenty of neglected Chrysler 3.6!engines with no timing chain or VVT issues like GM cars have. Also you opened the hood on the wrangler the correct way lol. That’s how I open all of them. The prop rod is for the customer to fill their washer solvent and the rare occasion where a customer checks oil. And screw them hack mechanics. I hate when I get a car that I see a bunch of butchering, missing bolts, misrouted wiring, amongst other things, then I have to figure out how the car is supposed to go back together. My conscience won’t let me hack on a car. Customers pay tons of money to get their cars fixed and it should be done right, even if it’s an 07 rotted Caliber.

[@AlexTheCarDoctor]

Aman brother 100% true I like you where are you from

[@77DucMon]

I had, key word HAD, a Cadillac CTS with the dreaded GM 3.6. You are right about the timing chain and gear issues. But also a flaw that can present as a timing chain but is really much much worse. The crank position reluctor ring on the back of the crankshaft is just pressed on and can shift. When that happens it’s a crankshaft replacement. Big $$$! For a piss poor design. Should have been keyed. I also ironically have a 2014 Wrangler Rubicon with the 3.6 Pentastar 120k+ miles and really no engine issues, oh save for the oil cooler leaked and needed replacement at 80k miles. It’s stupid that it’s plastic and under the intake, but at least it’s fairly cheep.

[@davidperry4013]

Even aluminum intake manifolds can crack if you tighten them too much. A manual ratchet is the proper way to tighten an intake manifold.

[@richsweeney1115]

Dodge sucks.....theyre not good motors...not even close.

[@xjssts7127]

Why you gonna cry let the customer cry, they chose that vehicle not you, if Chrysler don't give a dam about their cars about their customers why do you care? Next time buy a Toyota or a Honda stay away from American cars. I spoke with one mechanic he said they had few wranglers like this at their shop with bunch of problems they brake at nothing.

[@county23]

My 2019 Ram has the 3.6 and got the check engine and soon the tick tick tick, took it to one of the local parts stores, they did the scan tool, got the code, Cylinder #3 either spark plug or coil pack, I couldnt get it into a dealer for 30 days, took it to a local shop, nope! it wasn't either, it was a bad cam, flat spot on cylinder #3.. not a cheap date.

[@ghostchicken69]

The mechanic prior doesn't take pride of his job...

[@AlexTheCarDoctor]

That’s what’s wrong with mechanics this days

[@ronaldbrosius7488]

Great video, its great to see mechanics care about their work. You my friend are doing Awesome!!

[@AlexTheCarDoctor]

Thanks man

[@hksjoshua]

Pentastars are great but if you only have short drives you will have issues.

[@TheDirtCreature]

We lived in a city and most of our drives were highway since we used it to get out of the city. It makes no difference. It is a design defect.

[@riverrail]

Remove the ASD relay and you can do a compression test with out the fuel system to be bleed. ASD relay + voltage to the injectors and the coils

[@AlexTheCarDoctor]

Did not know it had a auto shut down relay so I didn’t bother mentioning it. Thanks for the information buddy

[@deanedell362]

Jeep's engine warranty is 5 years or 60k miles.

[@howsithangin03]

Great work. I first encountered this problem on a 2011 charger then a 2014 jeep and now a 2018 grand caravan.. Finally the grand caravans owner paid to tear down and the issue is actually the exhaust valve seats. Chrysler is aware of this problem and check engine comes on for different reasons o2 codes or misfire codes and yes its common on cylinder 2 4 or 6 After hours on the phone with Chrysler i was able to actually speak to a good tech. The cause for the issue is the robot that assembled the head put incorrect valve seats.. Sooo there you have it.

[@AlexTheCarDoctor]

Thanks for the information buddy

[@howsithangin03]

Anytime. " knowledge cant be power if you dont share it with no one"

[@AlexTheCarDoctor]

@@howsithangin03 I love it thanks again

[@howsithangin03]

@Jimmy S Its possible... But i dont think thats the case with the 96k mile one.. by went away for 2 or 3 weeks im assuming u mean no check engine light on. But the misfire is still there u can feel it in the body or even see the engine shake now to continue the issue i believe is the seats are misshapen just a tad to where over time it causes the valve to not completely seat correctly putting more pressure on one side or the other and the valve bends just a tad and begins to wobble and if left that way for some time especially at higher rpms it wreaks havoc on the lifters sooo that may be what you were hearing in the valve cover.. the 2018 grand caravan i first posted actually went to the dealer due to being covered under there extended warranty Brand new head replacement Cost was $1682.13 for parts $2000 for labor in california so its a pretty penny

[@187onYaAs]

My 15 challenger 3.6 got its lifters rockers cam and exhast valve replaced at 100k, was literally almost at the end of my warranty so that was covered, it was an 11k job my deductible was 300 😅. But yea i thought i caused it by riding hard on her always red lining 1st and 2nd gear so my exhaust pops lol. I have the paddle shifters/sport mode. Now at 122k and i just replaced the thermostat and water pump. Hoping the engine makes it to 300k

[@glanphear588]

Hi, very important! You were supposed to cover up that exposed intake manifold (6 holes) so that you don’t drop tools or debris down in the exposed engine. 😣

[@AlexTheCarDoctor]

Hey buddy and thanks for watching.I only cover them up if I’m leaving the work area.I’m always paying close attention.and plus I’ve been doing it that way for about 12 years and no problem. thanks for the advice

[@glanphear588]

@@AlexTheCarDoctor I get your experience, but even experience people make mistakes.. it only takes one ratchet socket to fall down in one of those holes and basically that Pentastar engine could be ruined. Just my observation and based off watching other mechanics working on that type of engine and they would stress covering up those holes as I own a 3.6L Pentastar myself.

[@AlexTheCarDoctor]

You right about that buddy. Thanks for the advice man

[@VWtech562]

I'm also a mechanic... you can't cover the holes when checking compression.

[@rick5644]

Cover the manifold before something drops down there.. Otherwise good video!

[@AlexTheCarDoctor]

Thanks buddy

[@Ray526]

Received bad new tonight. My 2014 Jeep Wrangler with 49485 miles needs new engine. This engine sucks. Why put a new engine that sucks?

[@AlexTheCarDoctor]

GM LS swap it. They make this engine’s so they tear up quickly so the dealership I mean stealership can make more money that’s my opinion

[@traviolisupreme]

Poor Pentastar, someone neglected him in the past, such low km’s too, fixable but at 40k that’s just full neglect from previous owner ☹️

[@AlexTheCarDoctor]

They said they took care of it but you know how that works sometimes

[@chiefjoseph8154]

Took care of mine, junk engine.

[@TheDirtCreature]

No! I replaced oil with premium every 3-4,000 miles. I had both a 2009 and 2014 (still have the 2014). The 2009 oil cooler broke (common problem). The 2014 had passenger side lifters replaced under warranty (common problem). Then at 80,000 miles the driver head had to be replaced for P0302. Poor maintenance will help to kill an engine, but these issues are well known, documented, and Chrysler is paying for the work as a warranty fix, regardless of mileage.

[@MrBenjo55]

I just did all my phasers , rockers, and lifters on my 3.6 Jeep that has 130k! works great! But it was not easy!

[@AlexTheCarDoctor]

Sounds like you are the man,that was a big job

[@MrBenjo55]

@@AlexTheCarDoctor Thanks man! Love your videos!

[@AlexTheCarDoctor]

@@MrBenjo55 thanks for the support buddy

[@robocowone464]

Probably hasn't had an oil change in 40000 miles.

[@johnhiram1207]

How sad at 40k the engine needs this amount of work. Jeep ain't what they used to be for sure. Did this person keep oil changed? Often that can cause a failure like this.

[@AlexTheCarDoctor]

Yes they’re not what they used to be for sure. From my understanding they took very good care of it, always changing the oil.I do know it was some type of recall on the cylinder head failure that this jeep was experiencing nevertheless the bad dealership took care of it under warranty so I was very happy for them.

[@jeepfan75]

no Chrysler dosnt care about their quality issues with their customers. they don't stand behind their products at all. they know there's quality issues and do nothing about it...

[@jkwfo]

I retired from working on these and all the other engines Chrysler made and I can tell you I made a butt load of money , so hey Chrysler or whom ever buys them DONT FIX THEM WE NEED THE MONEY

[@TheGeorgiaMediaGroup]

I have a 4.0 online 6. In my jeep. Love it

[@gmtully42]

Had the same problem on cylinder head #2 of 2014 Wrangler Rubicon w/ 70k miles. After failed compression tests had a dealership replace the cylinder head. After I went under the hood and found multiple hack mechanic examples including the plastic bolts that seat the air filter housing being broken. After the first 2+ hr. road trip I am having high RPMs when starting and cycling through low gears. Going to replace crankshaft sensor and see if that is problem.

[@AlexTheCarDoctor]

Dang man I wish people would take more pride in what they do

[@JasPlun]

I had a 2015 Ford Fusion SE with the 2.5l engine that had a cracked cylinder head in 3 places at 22k miles. Ford fixed it under warranty and said it was a bad head from the forge. Testiment to Ford quality control because a 3rd party made the heads and so it got passed their quality control and past Fords quality control. Later on at 55k it had a bad head gasket. I got wise and have a Toyota Camry in the drive for my wife now. Best decision I ever made for her. I figured this Jeep had a cracked cylinder head from the start because so many Pentastars have them. Its a well known issue so I immediately thought that when it was mis-firing. Good work though keep it up man:P

[@JavaJon3D]

I just replaced the oil filter housing on my 3.6 in my Dodge Grand Caravan and I cracked the upper intake manifold plenum while tightening one of the screws with my torque wrench. Can't imagine using power tools on that plastic!

[@AlexTheCarDoctor]

I follow this Mobile mechanic on Facebook and I seen him tightening down an intake on a 3.6 Pentastar with a impact that I was smh

[@veryconfusing]

The right piece of rubber hose ( stiff braided type ) is also awesome for walking spark plugs out and in. I have had the same four pieces I use for about the last 15 years in my "odd stuff" toolbox drawer. Thanks for video !

[@289hipo]

Been using that hose on sparkplug technique for 48 yrs

[@Greenwitch_Garden]

Thank you for the information! You explain things so well. I’m the sole owner of my 2017 Jeep JKUR and starting to have many common issues. I’m learning about common problems so I can get ahead of them. Fortunately I followed the engine break in guidance 😅 and got an extended warranty but now I’m out of warranty at 110k and learning A LOT!

[@AlexTheCarDoctor]

Just stay on top of the maintenance and you will be good, sounds like you’re doing all the right stuff. thanks for watching

[@azizabahati7037]

Hi there! Would the extended warranty cover the tick?

[@sergiomiranda1497]

This 3.6 pentastar engine is an absolute disgrace, problems on top of problems.

[@AlexTheCarDoctor]

I’m actually thinking about making a video about the Pentastar. What do you think?

[@sergiomiranda1497]

@@AlexTheCarDoctor do it. I own one of these and do some work on it and I'm telling you it's every six months a major problem comes in.

[@AlexTheCarDoctor]

I believe it!

[@JP-nisu_2]

Me and my Brother have two 13’jeep wrangler Rubicon’s 2dr 3.6 L - Both are about 95,000 miles, no issues with the engine or transmission one has developed a leak in the front driver side axle seal no other issues.

[@casper3130]

Fuel Injection sucks hard! Repair Dealers are expensive, injectors are expensive and the job itself is royal pain! Carburetors where cheap and easy repairs, I could take a carburetor off rebuild it and have it installed and adjusted within 2 hours for less than $50 and I so wish I had kept my carburetor fueled engine vehicles and just restored them.

[@AlexTheCarDoctor]

I’m pretty good at rebuilding carbs but suck at adjusting them lol

[@William-rf8oh]

I have a cylinder 1 misfire 3.6 2016 charger. Could bad gas?

[@MitchGaar]

Never dump fuel in a cylinder! It will wash out that cylinders! Bad for pistons too!

[@tommyclickclick]

does anyone know what vehicles with the 3.6 pentastar are compatible donors? I do have the same issue on my 17 JKU and it had less than 30k miles, I am looking forward to replace the whole engine instead trying to fix the cylinder head

[@AlexTheCarDoctor]

Hey buddy I don’t know the answer to your question but here’s a tip, at many local Salvage auto places they have the software that tells what year is compatible with your vehicle.you may want to give them a call and see if they can help you,you may have to call a few.good luck

[@reelnative01]

On that drives side head it’s 10yrs 150k miles they have a ext warranty on that head

[@Rocky-d7t1q]

Maybe the miles was turn back,400,000 vehicles mile are turn back in a year 😢

[@knockout77]

hello, how much do you charge to change a head because of cylinder 6?

[@djduvi88]

Hi Alex. I’m Currently in the market for a wrangler. Would you recommend the 3.8 v6 over the 3.6? I just don’t want to have head issues because it will be a substantial purchase. Let me know if anything. Thank you!

[@AlexTheCarDoctor]

Hey buddy yes the 3.8 was a wonderful engine. If you want something newer look into the four-cylinder that’s a great engine as well.I’m getting the four-cylinder diesel but I suggest the gas burner four-cylinder for you a little bit easier to maintain

[@djduvi88]

@@AlexTheCarDoctor thank you! You’re the man

[@AlexTheCarDoctor]

@@djduvi88 my pleasure buddy

[@sweetmcnasty]

The 3.8l will struggle in a head wind on the highway in a Jeep JK. The power is very anemic in those engines. The trade off for the 3.6l is the amount work to do for basic maintenance. If you want to lift the Jeep or get a 4 door, avoid the 3.8l. With a 2 door, the 3.8l is fine. I've had both engines and had more issues with the 3.8l than the 3.6l.

[@djduvi88]

@@sweetmcnasty I’m just afraid of the cylinder head issue if I go with the 3.6. I saw somewhere that if you do a lot of highway driving then the 3.6 engines are fine. Short city driving can stress it from lack of operating temp etc. Not sure if that’s true but I’m getting a 2013

[@MegaBenjamin]

The 3.6 is a very weird engine, some people get ones that last 250k and other get one that needs work every few months and they end up getting rid of it. You either get a good 3.6 or a bad one and there is no in between

[@michelsolounias1447]

How do you know you have a good one?

[@MegaBenjamin]

The 3.6 is a very weird engine, some people get ones that last 250k and other get one that needs work every few months and they end up getting rid of it. You either get a good 3.6 or a bad one and there is no in between

[@michelsolounias1447]

How do you know when you have a good one?

[@Rnemhrd]

Offroaded it and probably overheated it. Lifted jeep. Just a guess. Had one. Seen people overheat these in the mud. Maybe a valve seat problem.

[@upsman1313]

Do you have a video doing head removal and install on the 3.6L Jeep? I need to replace left head.

[@DependableAutoTruck]

before i scared the customer i would have pulled the valve cover knowing the problems with lash adjusters and rocker arm problems with those engines might have lost lobe on cam but everyone goes about diag differently

[@AlexTheCarDoctor]

It was definitely the cylinder head. Either way it was under warranty. They went and got it changed for free and that solved the problem.

[@damian4608]

Whoa , that's one UNPROFESSIONAL mechanic..... Don't make a video if half the time you say I don't know this,I don't know that , I haven't checked the specs........

[@AlexTheCarDoctor]

Man get out of here. I film these videos in real time as I go along. No scripts, nothing fake. And don’t judge me out off of one 30 minute video…. I have 300 others. Go watch all of them and then form an opinion. Go check my reviews and then form an opinion.

[@lstruggy]

No disconnecting the negative battery?

[@thechad5764]

Its a 3.6......they were junk when they were brand new no matter what vehicle they put them in

[@davidsias5351]

Whoever service that before should be ashamed of their self

[@AlexTheCarDoctor]

They don’t need to be around anymore cars again

[@worksonit1]

NGK makes ACDelco plugs .. just fyi, good vid, appreciate the info

[@AlexTheCarDoctor]

I didn’t know that

[@queensapphire7717]

I just wish they use 10MM on all, the 8 10 switch annoying.

[@AmricanEagl]

I own a town and country 2014, it has the same exact engine but 117k on it with same exact problem 😞

[@AlexTheCarDoctor]

Wow sorry to hear that

[@jasonbaxter5502]

The problem will keep happening no matter tell the wire harnesses is fixed.

[@dieselbronco9247]

Last guy just plain didn't know any better or just flat didn't care, I mean how much is a set of hose pliers? I think mine came from horrible freight for like $20 for a 3 piece set. Gotta do the job right and at least make it look like you know what you're doing.

[@AlexTheCarDoctor]

I was always Taught do it right or don’t do it at all.thanks for watching

[@davidwebster3510]

Still under warranty something doesn’t seem right with this video .why would you go to another place other then the dealer. That would void the warranty.

[@AlexTheCarDoctor]

Some people don’t trust the dealership. Sometimes dealership takes months to get to a vehicle. Needless to say, they took it to the dealership after this video and the cylinder head was replaced under warranty.

[@stevethompson7613]

I had my oil cooler and spark plugs replaced on my 2015 Wrangler Rubicon. Since I had it changed my gas mileage has tanked (no pun intended) and it’s sluggish. What could be causing this? I am not getting any codes at all.

[@AlexTheCarDoctor]

Hey buddy sorry to here the bad news and thanks for watching. What type of plugs did you install Brand and material

[@stevethompson7613]

@@AlexTheCarDoctor I’m not sure what was used I took it to a shop. I can check them.

[@AlexTheCarDoctor]

@@stevethompson7613 they may Lie to you get a unbiased opinion have a friend or mechanic buddy pull one of the plugs out and let me know what you see

[@stevethompson7613]

@@AlexTheCarDoctor you’re not that far from me and my son lives in the city where you have your shop. I don’t care to drive 4.5 hours to have you to look at it.

[@AlexTheCarDoctor]

@@stevethompson7613 I understand! I’d be happy to check it out for you if and when you come to town. Call ahead when you ready so I can be prepared for you.

[@TwoFeatherChannel]

I have the same engine in my JLUR Jeep. I hope I win the lottery when it happens to mine, cause I'm throwing in a LS in it. I have 400,000 miles in a Silverado with an LS in it. Question: Why can't you use other brands of Spark Plugs in the 3.6 Pentastar engine?

[@Josh-bu4zx]

This is why you don’t buy a new Jeep. Fiat made. Sad to see the death of Jeep reliability. I’ve owned several XJs with over 250k miles that ran great. Original engine and transmission. Fun fact: the XJ has an Aisin auto trans. Aisin makes some of the best transmissions, Toyota also uses their trans and parts. Also owned an 06 wrangler with over 130k miles. Anything after 06 seems to have way too many problems since Chrysler went to using Fiat parts. Chrysler alone is bad enough, but once Fiat also got into the mix that was it.

[@AlexTheCarDoctor]

I Did not know that about the transmission thanks for Sharing your knowledge buddy,and you are right about the year

[@Josh-bu4zx]

@@AlexTheCarDoctor No problem, the transmission used in the cherokees from 1987-2001 is the A340H Aisin transmission. Chrysler called it the AW4 auto trans, perhaps they didn't want to admit to using a transmission that wasn't their own.

[@lagoots]

2018 with 40,000 miles ? Doesn't Jeep have a 60,000 mile 5 year powertrain warranty? Is what your working on in this video not covered?

[@AlexTheCarDoctor]

Yes it was covered I told them to take it to the dealership and the dealership took care of them

[@AlexTheCarDoctor]

Now I only see them on routine maintenance

[@DependableAutoTruck]

actually a professional mechanics tools should last longer than home owner because they shouldn't abuse them because they realize the value of taking care of them because that is their means of income. i am 67 still use most of the original tools i started with of course have had to update because of newer vehicles some new tools required but like my combination wrench set is the same set i started with at age 17 when i started my life as a mechanic. if you take care of your tools they will take care of you. everyone will brake a socket or ratchet all along but the basic tools should last. i just updated my screwdriver set which was a SK that i bought about age 20 but i don't use screw drivers as prybars or chisels. tools used properly will last almost a lifetime

[@papamrk1343]

Alex... THIS WAS VERY EDUCATIONAL!!! I have a P306 ERROR with 40 PSI on my NO# 6. Looks like gotta take out a Mortgage??? or do I.... Can you give a round a bout figure of what that follow on work might cost??? Tks!

[@zublacus]

I'm crying. My 2017 tossed a P0302 while on the Rubicon Trail. 40,300 miles on the engine. I pushed and my dealer pushed, and Jeep is going to cover this and I have to pay $1500 deductible. I drove this engine around town and wheeled it. It's not my primary vehicle. I changed the oil religiously with Amzoil. Looks I like I'll get it fixed (My compression was about the same..80% of normal) but I think I'm going. to start a HEMI fund.

[@dandtintennessee7675]

Facing the same thing but we're at 120k miles. Cylinder 3 misfires when first start it and coolant vanishing. Started this morning and a huge plume of white smoke. Gonna have to have a head gasket looks like..

[@queensapphire7717]

That should still be under warranty, Mopar has a 5yr/60k on Powertrain for Jeep vehicles. My 2016 has 7/100k powertrain warranty, as I bought it Certified Pre Owned (CPO) and it is covered until April 2024, but the normal powertrain is 5 year / 60k miles. In 2021, when this video was made, A 2018 with 40k miles in 2021 ? THAT VEHICLE WAS STILL UNDER POWERTRAIN WARRANTY !!!! They would have probably given him a new engine.

[@hunterwilliams360]

what did the customer do? do you have a part 2 on this?

[@GRO646]

What ever happen with this jeep? Did it get a new head or motor? I have the same exact issue on my 16 jku.

[@AlexTheCarDoctor]

Hey there and thanks for watching. I think the dealership replaced the cylinder head if I remember correctly, it was still under warranty.

[@aaronmanley7595]

Awesome vid, man! I have a 2015 Jeep Wrangler JK with a 3.6L & have been dealing with a misfire the last month - rocker arms and lifters! I'll be doing those this weekend! There is a lawsuit currently in place against Chrysler/Dodge for these motors, specifically to the previously mentioned engine components. Really sad given how inexpensive the rockers and lifters are and additionally, being tied to the Jeep name. Curious to know if this was the issue got had and repaired on this particular vehicle? Thanks again for sharing! I really enjoy your analysis on different things and your teaching abilities! Keep it up, man!

[@darknes7800]

You need a new head, its the only real fix for the issue.

[@TheDirtCreature]

@@darknes7800 Exactly. The lifters probably failed and so the exhaust port burned through. The dreaded P0302.