Jeep Liberty 3.7L P0300 Multiple Cylinder Misfire
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- čas přidán 27. 06. 2020
- My sister has a 2006 Jeep Liberty with a 3.7 Liter engine and had an issue. She had it put on a computer for testing and got an error code P0300. She paid $350 for a garage to put on 2 new coils that didn't fix the problem. I diagnosed it down to a $36 oxygen sensor and that fixed the problem.
Found this video as a troubleshooting search.
Had multiple misfire code and cylinder 4 misfire code.
Did usual coil pack and plugs. Cleared code. Came back during driving relearn.
Replaced the upstream o2 sensor. ( pain in butt to unplug and plug back in connection.
Drove 50 miles....all in the green. No dtc's
Thank you! Never would have thought...you rock!
Trying to replace upstream bank 1 sensor. Can not reach the dang connector...
This will finally resolve my issue. That same side is where the antifreeze leaks out from overflow. Added history of possible cause based on my 05 Liberty history. Gratitude brother! Many blessings
Did you fix your antifreeze leak?
THANK YOU! Got P0300 intermittently and once while was running good I got an O2 sensor code which I likely would have ignored at least initially until I saw this video. Will replace and post results!
Thank You for your help & video !! I have the same problem after changing all the coil & spark plugs !!
My daaughter's Liberty seems to have the same diagnosis. Thanks for the help-I will replace the sensors.
I watched this video after watching several others and after replacing the Spark Plugs, Crank Shaft position sensor, Camshaft position sensor and Map sensor, the code P0300 still came up. I saw your video and changed out Both Up Stream O2 sensors. WOO HOO!! the Problem was solved! thanks for videoing that.
Glad to be of help.
You frickin rock! Exact same problem with our 2011 liberty, same code so I went and got a new sensor and whatya know... Runs like new now. No more misfire, no more blinking engine light. Cant thank you enough!!!!
I had the same problem and changed plugs and coils. The same issue came back. I keep the hand held scanner on data out put settings and noticed one of the o2 sensors was putting out unsteady voltage readings. I changed the same o2 sensor as this video showed and have no more misfires. Thank you for pointing this out. It lead me in the right direction . Problem solved.
how long did it take for your issue to come back? I replaced the spark plugs a while back, and just now have a P0302 error. Did it immediately come back for you?
Did you onow id be here 2 yrs later. Thanks bro!
I posted because at the time I couldn't find crap on CZcams about the problem. A lot of people were saying possible valve issues. So when I figured it out, I decided to post the short video to help others with the same issue. I have like 370+ videos. I never dreamed this would be the most popular. Glad I could help...
You Da Man!!! Pretty sure this is what is wrong with mine. Wow I cannot get my hand on that connector plus I broke the 02 loose then it seized up. I went back and forth on it with a wrench put the 02 socket back on it and broke the socket in half. Enough fun for 1 day I ordered a better set of sockets and will have more fun in 2 days. Thank You for this video!!
Thank you so much bro. Hopefully this fixes my random misfire as well
Going through this now , really helpful! Thanks guy !
what did you find?
Awesome fix brah!!!! I have 2010 Jeep Liberty limited with 3.7L and I’m getting P0304 code(miss fire on cylinder 4). I’ll replace the spark plug wires, spark plugs twice, and fuel injectors twice and still having the same code
Did you ever get it fixed?
Just like everyone else. I replaced everything but the O2 sensor. Just ordered and hope that fixes the issue. Thanks for the video.
What happened, was that the problem?
Just gave up and sold the thing. O2 didn't fix the issue. Sorry, I don't have any better news for you. @@SrColon309
I just bought a 2003 liberty and is running rough I’ll try this first! Thanks
Thanks a ton that's exactly what was wrong with mine too. Same plug and everything.
Glad my video helped you brother..
I have 2012 Jeep Liberty same problem how do I check the sensor will it screw up my computer by changing the sensor and is there more than one sensor
You are my hero!!!
Glad to help all I can.
Thanks for the information.
I posted this because it seems to be a common problem and nobody else posts it.
Oh thank you!!! I've been chasing the exact same problem on my girlfriend's 2005.
You're very welcome. I hope it fixes her issue. The sensor was cheap. Like $20 or $25.
Many people have spent hundreds, including my sister, replacing coils that didn't need replaced.
Yeah my 2006 same exact problems going on...now I have hope!
@@Kennedy4OurCountry I hope you get it fixed.
i have a 2011 nitro with 3.7 and misfire on 5 and 2 and well they cut the cats off and piped it with no o2s so wonder if thats the issue with it
I have codes 0172 and 0175 too would this be the o2 sensor? I replaced the coils and spark plugs and t case still idle rough and smell gas. And also cuts off when leaving it run. I think it says running to rich ?? HELP PLEASE
I have a 09 liberty misfire extended crank no start and when it do start stay on for two seconds shake and shut off would be a 02 sensor
Thank for your video , appreciated
You're welcome. Glad to help.
Ran into many issues with my 02 liberty 3.7 L. Multiple misfires, running rough, etc. AUTEL reader would show numerous codes. I bought it with 170K on a supposedly "newly rebuilt" 🤔 motor. I have put 10K on it. I love driving it but geeze it's been an adventure ! Have replaced all O2 sensors, water pump twice, new brakes front and rear, tires, etc.. etc. It has always had the ticking noise but I noticed the past week a tapping sound coming from the drivers side valve cover. Like someone randomly hitting it with a hammer. I have been chasing the dreaded CEL light on and or flashing on for 6 months. I am pretty positive after watching CZcams videos that my rocker arm has fell off ! Mechanic today said he keeps plenty of these rockers in stock as he has done plenty. Estimate is $300, which I will gladly pay. Used vehicle prices are outrageous ! And Chrysler should have taken care of this very known issue. 🙄 . Here's hoping for the best results next week. 🤞
Bad news ..... Head gasket blown 🤪. Replaced with good used motor, parts and labor $3,100.00. Still beats the costs of a used vehicle, what with the outrageous prices nowadays. At least I know what I have now.
@@stansmad I woulda did it for 1grand
i had a cyclinder 1 misfire i did all the coils all the spark plugs fuel injectors and 4 new o2 sensors and now its missing worse then ever and gives me 4 high voltage o2 sensor codes for every sensor in the car.... is it possiable all 4 o2 sensors are faulty?
Good job Andy, sometimes those o2 sensors are a nightmare to remove.
Did you watch the video. I fixed it. I put this video up to help others with the same issue.
@@poopingandroid hi Andy good to see you back. just saw first few mins ill catch up on it.
Hope you're keeping well Andy , miss you're videos.
Dammmmm man I have the same issues but I have grand cherokee 2006 3.7 v6 I been change a lot things including coils and everything elese even computer and i still have the same issues random missfire im tired to spend a lot money and time trying tl fix it but always go back to the spot can please help me thanks man i will appreciate you
I have a similar issue. P300 and p302 (passenger) flashing CEL light.
Hi Andy, we haven't had a new video of you for a long time, I was wondering if you're okay.
Tell us how are you my friend
It can jump timing on one side by a couple of teeth and it will cause that because that engine has a separate chain for each side and a chain in the center so 3 timing chains one engine
Stupid question, is that the upstream sensor?
Ford had the same problem back in the early 90s on the 300 6cyl.
I'm having simular issues. I replaced all my coils and plugs. Question about how it was running before, because I get the same stories on the rocker arm problem. Before you replaced the O2 sensor did the engine knock really bad.
Found my issue. Replaced the O2 sensors and still had same issue. Decided to check the rockers, and while doing so I noticed the timing was off. Went to reset the timing and heard something metallic fall down the chain way. So ended up pulling the timing cover and found out all my tensioners were broken. Surprisingly no damage to the engine from the parts that broke off.
Thank you for the video
You are very welcome. I never dreamed my video would help so many people when I made it. I am shocked at the thanks that I get.
Hi I have a 2007 Liberty 3.7L V6, 117,000 miles. Owned it since 67,000 miles. It operated perfectly for the first 30,000 miles and then it started getting a #1 Cyl misfire code P0301. It also seldomly gets a #1 cyl fuel injector circuit open P0201. It must be a very mild fault as the misfire freeze frame data shows it always happens at less than 350 rpm and when cleared it comes back immediately at next startup, cold or hot. So it seems to only happen once on startup as its moving up to regular idle speed. The miss isnt noticeable when driving or idling. Its getting 15.5 mpg fuel mileage. Doesnt burn oil. Doesnt smoke. Has great power. I've changed plugs and coils but no difference. Cleaned air intake, air filter, and ran cleaner through system. I've cleaned and inspected the injector plug and all wires but no difference. Dry / wet compression test of #1, 3 and 5 cylinders all read good: 160 / 175 psi.
I'm wondering if there's a mild wire defect for that injector, or just a flakey connection somewhere. Has anyone tried to use a new set of compatible gauge wires and run them to a place closer to the injector control? I can't see where the wires go though.
I'm not sure if I should just live with this, or troubleshoot it more. I don’t care about the engine light as we don't have emission requirements. Now that I know the compression is good, I'm not so worried about it.
Any suggestions of what to do next? Thanks!
Pics are of what I'm curious the injector wires are headed.
Hey did you ever figure put this problem my gfs 3.7 grand cherokee is doing the same thing have replaced everything but injector on cylinder 1
@bassboostedd8220 it was fuel injector. I should have ohm checked it to begin with. Read like 120 ohms. They should read 12.5 to 15 ohms. You can do it by simply disconnecting the plug, while it's still in car fuel rail. After swapping #1 then #4 started to do the same almost immediately. So Ohm check all of them. Replace any that read more than 15 ohms. It's pretty easy to swap them.
I bought a set of 6 rebuilt ones for $80ish on ebay.
@thesetruths1404 I really appreciate the reply man really the code is for injector misfire on cylinder 1 I have replaced everything above ! I will try with my multi meter when I get home.
hey brother, it's pgdedden here (Ur 500 sub giveaway compass winner), just checking how ya going, goin' thru my subs and remember U hahah. 👌
on my handheld reader its saying #6 misfire. its got a rough idle and misses on low rpms. higher rpms accelerating it kicks in and fires. engine light is on and flashes sometimes. only been doing it 3 days after i got "fresh" gas. im doing a fuel treatment then Im going to pull the plug and replace if needed. Then ill move onto the coil or the o2 sensor (whichever is cheaper). i didnt think about the sensor, so thanks for the input.
mine is doing the exact same thing. What was your final result?
I think I have the same problem with 135. I was thinking on taking out the rear one and seeing if that will fix the misfire. I guess to try before I guy the part. I have a good feeling that's what my problem is too.
You cannot just take it out or unplug it to test it. It is possible to test the sensors with a multimeter. Search CZcams for videos on that. I do not have a video on it.
Did that 3.7 cut off at 2500 when you where driving
How are you doing?
Excellent
I have the code P0306. Replace the coil and spark plug. but it is not solved. Would changing the oxygen sensor work?
Probably not. If it is only missing on one cylinder. #6 only then it is probably a valve issue.
Nice video man 👍🏼 I got one question I had my #4 coil misfiring which I changed it and cleared the code, everything’s great no codes my problem is that now I feel like that whole car shakes like if it’s loosing power, any suggestions?
Not really. If you have no check engine light. I did have a similar issue with my Jeep patriot and that turned out to be bad spark plugs. But I can't say that is your issue. Hard to tell not being able to witness it in person.
Yeah the light came back on and have the same problem yours you did so, I’m ordering new sensors and see what happens
@@ramonalvarez9485 what happend
Ok so I got cylinder 1 3 and 5 misfires with the O2 sensor codes. I'm confused of which O2 sensor to buy. You got up and downstream then left and right any clue brother?
My experience would tell me to replace the one on the drivers side that is right by the engine.. The one BEFORE the catalytic converter.. But experience also tells me that I would replace both since they generally go out close in time.. The one after the catalytic converter is less important and does not control the engine like the first 2..
@@poopingandroid word thanks man
How did you get to the plug? Great video.
Get to the plug to unplug it? Lay on your back and crawl under.
The jeep liberties have great motors but the sensors are the worst! Mine misfired bad when I first got it and my fix was replacing the cam and crank shaft sensors. Basically if a sensor goes bad, any sensor related to the motor running, it will misfire.
Everyone tried telling my sister it was valve issues. I did some study and found out it was that O2 sensor.
Fingers crossed I'm gonna replace this next
I hooked mine liberty up to a computer and it throw out a miss fire cylinder#2 and multiple miss fire I might have to try that o2 sensor
Have that problem now. No fire on cylinders 2-4-6 My 02 sensors are unplugged
I have the same exact problem should i replace just the sensor you showed in the video or should I change both.also where is the other 02 sensor located
They suggest changing them in pairs, but that's not my call to make.
@@poopingandroid where is the other sensor located
The same thing happens to mine, I'm going to check it.
Hi, have you heard from Escape Adventures? He hasn't been on CZcams for ages and people are worried about him, I hope he is ok. Do you know?
I have same P0300 on JGC 4.7 my mech. Is going to change sparks as he blames they are Densos (2 months old) and should have been only Champions. He disconnected both O2 sensors but there was no change, I do not want to spend for sparks if its not an issue.... What to do?
Your mechanic doesn't know what he is doing apparently. Disconnecting the O² sensors will not make it run better. The computer is getting a faulty reading as it is. That is why it is running poorly.. Disconnecting will make the computer get no signal and still run poorly because it will flood the cylinders with too much or too little gas. If the problem is only on odd or even cylinder numbers, then change the sensor on that side. If the misfire is random on both sides, the problem may be plugs or valves.
@@poopingandroid installed new plugs valves are good, what else?
Did you have lean burn codes or o2 codes?
Multiple cylinder misfire codes.
My Jeep Liberty 2010 Limited same model is experiencing the same fault code PO300 but there is a glitch in the engine itself.
It was found that the engine oil went into the piston region and spreaded all over inside the cavity. It made all the Interior of the engine very greasy and choked up.
Now what's the solution???
Can we clean that engine again by any cleaning agent or solution ????
To me that sounds like a bigger issue.. Possibly blown head gasket..
@@poopingandroid so should I change the full engine or only head gasket ????
Inside it is all greasy and mechanic is saying that he'll clean it up but didn't mentioned anything about gasket issue
@@nishihas I was only saying how I think you could get engine oil in the piston cylinder. I could not answer your question without seeing it myself..
@@poopingandroid okay is there any means for contacting you brother ?
so i am having the same issue with my 05 liberty. it was throwing multiple codes, including random misfire code and i replaced 2 upstream 02 sensors and the codes went away and it became drivable. now, it’s throwing the same code again. random multiple misfire… i took it too a shop when the codes first popped up and they charged me $300+ just to only say it was the battery. put in a new battery and it still showed the same codes and was still misfiring. so that’s when i replaced the 02 sensors and i replaced the alternator. now i’m here with the random misfire code once again.
Not sure my friend. I really am not a car guy. I just made and posted this video to help point others in the right direction. It is quite possible to have a bad sensor again. They are quite fragile. Especially if you have an engine that is not running well. If the engine is burning oil it could easily foul an O2 sensor in a short time.
is it a upstream sensor or downstream sensor ?
It is upstream thanks
Having same problem on 2007 Nitro 3.7. Mu question is, did it make a constant ticking noise while running and missfiring?
No Bud.. Ticking is probably lifter noise... You got bigger issues..
Ticking generally means lifter/ rocker arm/ cam/ valve issues, which can reduce fuel intake and reduce power..
Or cause misfire.. But could also foul a CO² sensor with unburnt fuel and cause false readings and misfires as a result.
Thanks guys. After plugs and coils, o2 sensor. Looks like gonna have to take the valve cover off.
Update: After all that I did had to take it to a garage. He changed all the lifter, and timing chain tensioners. After removing the head he found that piece of the head inside where valve goes thru broke off. Valve guide if im not mistaken. Pretty random but happens. Very expensive fix. New head, new piston. Anyway got it back everything seems ok, but there is a slight miss. Got code PO300. I changed the bank 2 upstream sensor before trip to the garage. Now im going to change the other side and see if it takes out that miss and slight shimmy at idle. I have read that these sensors should be replaced in pairs. I will give another update after I get it done.
A dealer charge her that or a mom and pop garage?
It was a local shop.
Yikes, I am having this same issue and codes. "02 sensor 2/1 slow response and 02 sensor 1/2 heater circuit high". Thanks.
Will that cause it to smoke?
Yes. It could. Any misfire could cause an engine to smoke.. But excessive smoke could indicate other, more expensive problems...
I’m currently having the same issue with my 09 Liberty limited. Changed coils and plugs. Checked vacuum lines. Cleared MIL. After the 4th drive cycle came back on. Confirmed same PO300. Same cylinders as before, 3 and 6. Do you think this issue could be the one and the same? I ask because my misfires are on both banks, not just one. I also need to add that there isn’t any cylinder specific codes present, just the PO300. Any advice would be greatly appreciated and helpful. Cheers 🍻
It's very possible. I changed the one O2 sensor on my sisters Jeep in the video and then the drivers side went bad just a short time later.
Interesting that the other side went bad. I’m going to switch out both the upstream and downstream sensors. I also need to add that using my DTC reader with live data, I’m watching both 02 sensors go from 0, 20, -10,-30 etc (random numbers i don’t remember the specific ones point being they’re all over the place) but I’ll give that a shot and let you know how it went. Thanks for your help and very quick reply. Cheers 🍻
@@Thealmightybyron Actually no. It is not unusual. I don't know if one gone bad can affect the other or what, but I have since learned that it is recommended to change both when one goes bad.
@@poopingandroid I completely agree with that. A little back story with this is it’s my wife’s jeep. She failed to tell me about the coolant being low. Well she overheated it. Drained the oil (needed changed anyway) no milkshake. No metal. Topped off the coolant and reservoir. Verified no leaks. Idk why it went bone dry but it did. A week later the P0300 code came up. Did the plugs and coils (from my first post) no change. I don’t think it’s a head gasket. I’m not hearing any of the tell tale signs or especially the steam from the exhaust. I’ve debated about having a compression test done (one tool I don’t have 😑) but again I don’t hear any signs or symptoms that would generally indicate a failed gasket. So idk. It’s entirety possible it cooked those sensors. 🤷🏼♂️.
@@Thealmightybyron These Jeeps are also known to have valve issues on occasion.. I got my compression tester off Amazon for like $40 or $50 and it's a complete kit. Might be worth the investment before spending a couple bills on O2 sensors and then you will have the compression tester for future use.
Yo! You never made a new video, all good? Let us know how you've been dude.
I justed changed all mine coils it cost 150.00 for six and changed out sensors 32.00 for 4 sensors
I only know of 3 O² sensors. One on each side before the cat and one after..
Tks
I did replaced the o2 sensors but failure still there….
What sensor did you replace and what are your P codes?
I have the same error code P0300 along with P0302 which is a cylinder 2 misfire. Autozone hooked up their scanner and their computer suggested to replace the fuel injector. Is the o2 sensor and fuel injector related? Does one affect the other? If it does, then which should I replace first?
I would suggest replacing the O2 sensor first and go from there.
I would change the exhaust co2 sensor and see what happens. It's cheap and easy to replace. And a P0300 error code is for MULTIPLE cylinder misfire... The 0302 is for cylinder 2.
They are know for valve problems but yup them o2 sensors suck get all kings of false readings
did you replace them all or just that 1 sensor
I replaced the 1 but had to replace the other shortly after. It is recommended to replace both upstream sensors at the same time. From experience, I agree.
Okay also before you fixed it was the truck not letting you go over 40 before it started jerking like it didn't want to go any faster
@@lelandpippin9659 Yes.. Starved for fuel..
Appreciate you man I'm gone try that now
Lol omg I can't believe what you said
This is me working on a car
What’s the part number?
I have no idea. They will know at the auto parts store if you tell them what you need.
If I’m getting p0138 02 sensor Circuit high voltage bank 1 sensor 2 and misfire on cylinder 6
Do you think it’s still the same sensor in this video?
I already replaced spark plug and Coil pack on cylinder 6 but still have the same code
@@5248momo Dude I don't know the part number. My sister paid over $300 to have coils and plugs replaced on her Jeep too. Simply tell the Auto Parts place that you want the O2 sensor for passenger side BEFORE the catalytic converter.
I'm right behind you...right now...at burger king
Don't think so bud. I don't visit McDonald's or Burger King.. Well, maybe.. Only one time a few months ago. What city..
I replaced that sensor, but it's still doing it
There's 3 of them.. You should have looked up how to test and see which one was needing to be replaced. 1 on each side before the catalytic converter and 1 after.. Usually it's one of the front 2 in my experience.. Suggestion is to replace both front ones at the same time because they generally go out together withing a short time..
@@poopingandroid ok, I'll look into that's
thank you
Is the upstream the front ones
Dude. Help...just replaced the sensor and now my jeep won't start!!
You can always change it back. And it is possible that you got a damaged sensor. They are a bit fragile.
It's not the sensor. I had the stereo on when I pulled the sensor. And I got shocked. No fuse blown...starter is ok. Alternator is ok. Plugs seem fine. With the relay in...it does nothing but turn the lights and stuff on. I can bypass the remand it turns but won't start. I'm lost ...need help bad. May loose my job monday if I can't be there
Where you been dude!? You don't upload much anymore
I am back in Michigan. I will do a video soon. CZcams threatened to demonititize me unless I do a video. Which to me is crap since my videos still make me money.
Damn same jeep liberty same code same problem.
I think I can fix it!
Edit: won't start at all now.
Dang.
The reason my car died (completely!) was a broken lgnition accentuator...located in steering wheel.
600 bucks but I'm not complaining.
The check engine light went off.
Jeep was still missing, just a tiny bit.
So I got seafoam for older engines..
Works pretty darn good.
Here's a similar video I did over a year ago which explains how this problem occurs. czcams.com/video/d7aVG-ZsINk/video.html
i have same code...once in a while I lose power and it shakes..
and the check engine light blinks when it happens
With my sisters car there was I think a P0302 and a P0304 error code which told me that it was on the passengers side and told me which one to change. But it is best to change both at the same time, since they both tend to go out together.
@@poopingandroid I have a 2005 Jeep Liberty Renegade 3.7 lt
@@Evocati-Augusti The Jeep in the video is my sisters 2006 Liberty with 3.7L.. But if you read comments lots of people have this problem. It really shocked me how many people this short video has helped. By far my most popular video with like 50 views a day and average viewing duration of people watching about 40% of the video and that's probably because a lot of the people watch it all then come back and watch parts as they change their own.. Seems to be a very common problem..
@@poopingandroid My muffler has a massive chunk missing, I should replace that 1st , and then do the 02s, because I have an o2 code as well...and the same thing happened with my Euro 1983 911SC...it took me a year to find the right o2 sensor...and it ran like sht. I'm used to Porsche engines and Saab engines, they're user-friendly and I've been working on them since I was 13. this engine when looking at it,..... I just wanna take a hand full of Xanax..
So this was the upstream O2 you replaced? How many O2 sensors on 3.7l. I have been trying to fix a random misfire at idle for months on my liberty (p0351/2/3. changed plugs/coils.injectors/fuel pump/filter no luck, still random misfires but no more codes. Finally learnt about fuel trims short trims are always plus or minus a few % BUT my long term fuel trims are always -20+ so must be running too rich, plus there is smell of exhaust fumes when driving so guessing its the cat or exhaust leak. Could it be just O2? Good video anyway :)