Jeep Liberty: Cranks, Starts, Stalls, Runs Rough- Part I

Рет қаралды 261,318

6 жыл бұрын

In this video we take a look at a Jeep Liberty 3.7 that was purchased from an auction and then towed into the shop from a local dealer. You could get the engine to start on occasion but when you did it had a lot of mechanical engine noise and would not idle. Let's see what we find. -Enjoy!
PART II "The Follow Up" : kzfaq.info/get/bejne/r7KBp8li3ci6kas.html
PICO FILES COLLECTED IN THIS VIDEO: drive.google.com/open?id=1x7WAkAcGL1O6s1ZqBPIeRwdlmzbH-GYp
FREE PICO SOFTWARE (MUST HAVE TO VIEW FILES) : www.picoauto.com/downloads
3/8" Drive SAE & Metric Spark Plug Socket Set : amzn.to/2GgoRgl
Autel Maxidas DS808(Upgraded Version of DS708) Automotive Diagnostic Tool OBD2: amzn.to/2G8ZIR9
PicoScope PP925 Advanced Automotive Kit - 4 Channel: amzn.to/2ugrp9d
WPS500X Pressure Transducer: amzn.to/2pzjrDE
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Пікірлер: 528

@oldsilkhat7893 6 жыл бұрын

At right around 15 minutes I was getting anxious saying "just do a compression test" then came the words of wisdom that will stick with me for ever...." A compression test proves a cylinder can seal, but it does not prove it can breath" priceless advice right there.

@SouthMainAuto 6 жыл бұрын

However, a running compression test will show how it breaths, but ours does not run 😉

@youbreakemwefixem7209 6 жыл бұрын

Was thinking exactly the same thing. Learned something new right there!

@SouthMainAuto 6 жыл бұрын

It does prove Kerryithm2. It proves the engine can seal :)

@oldsilkhat7893 6 жыл бұрын

Thanks missed that

@SushiPac 6 жыл бұрын

I LOVE these video using scan tools and the PICO scope!!! That's one think I would love to get better at is using those tools and knowing what I'm looking at when using them. Because they can tell you a lot of information with out touching much of the vehicle. Thank you for taking your time to film this and also editing it and posting it. I know your a busy busy man but it's greatly appreciated Eric!!! Hope you have a great day and will be looking forward to the next video what ever it may be I'll be watching it anyways!!! Life time subscriber!!

@mannys9130 6 жыл бұрын

Damn Eric, you're amazing. First try, right on the money with the diag. I was stumped looking at that RCT but your idea clicked right away. Your channel has driven home the idea that a scope and good scan tool (as well as competency) are CRITICAL to a shop serious about diag.

@longrider8265 4 жыл бұрын

This is what a very skilled mechanic looks like these days - fantastic work and teaching Eric !

@94jimmy5 6 жыл бұрын

Understanding what the diagnostic equipment is telling you is the hard part. You're experience makes it look easy. Well done.

@haywardsautomotive6156 6 жыл бұрын

Ahh such a pleasure watching you diagnose while I'm kicked back feet up drinking coffee...and I didn't get dirty or have to clean up after...semi-retirement is good. Great video Eric and diagnosis as usual. I could watch you work all day :D

@Paul1958R 6 жыл бұрын

Eric, One of your finest videos! Clear, concise, accurate diagnosis and presented in a way that I could understand it. I love your white board presentation and explanation. Where were you when Jim Lovell needed you? LOL!!! Looking forward to part 2. God bless Paul

@RingZero 6 жыл бұрын

Great troubleshooting Eric! Finding the root cause is more productive than throwing parts at it👏🏻👏🏻👏🏻

@chickmagpunk 6 жыл бұрын

Wow screen capture in the vid! You went all out for us folks Mr.O. Excellent as always, enjoy your weekend :)

@spelunkerd 6 жыл бұрын

What an excellent case study. I suspect many professionals would shrug and never explore it enough to find such compelling evidence. I was thinking it was going to be a timing issue, but then when I saw the spark coincident with TDC compression, I had to reconsider. Also I didn't jump at the most important finding, extremely HIGH torque to spin over those two cylinders. These are the problems that make auto repair so interesting.

@richardbambenek2601 5 жыл бұрын

Eric you gave me a flashback in that explanation back to when my instructor was talking about the spectral density of a signal over a sphere. Whaaaaaaaat!!!! Your diagnostic abilities are amazing.

@bobmoy3406 6 жыл бұрын

Cliffhanger, but we all know that Eric O is not just going to leave us hanging. Nice format of letting "The People" see whats the picoscope is showing in real time. Thanks for bringing us along and taking the time to edit the video.

@wyattoneable 6 жыл бұрын

Yes sir, I followed along. Your explanation was easy to follow and the PICO screen on the video was really helpful in understanding what was going on. I'll be paying more attention to the Jeep I'm looking at on Sunday and ask if routine oil changes have been completed. :)

@ShiversRSS 6 жыл бұрын

I look forward to your videos everyday. Love hearing you talk through your thought process on these trickier diagnostics.

@bostedtap8399 5 жыл бұрын

Excellent diagnosis, and pretty non-invasive. Very clear use of the Pico Scope. Thanks for sharing and best regards from the UK.

@graciescott3334 4 жыл бұрын

“Like jeeps sometimes do!” LOL. You are not kidding. Thank you so much for your videos. This was great information regarding firing order, exhaust, and compression. I like to understand how it works. Working on my daughters 07 Commander with 202k miles. It has the 3.7 like this liberty in the video. Nice addition to my Jeep videos.

@str-lrd3863 6 жыл бұрын

When I heard it crank and kinda run, my first thought was some kind of timing issue. Luckily you have the proper tools, and the most important tool under your hat, to quickly diagnose. Nice work! Can’t wait for part 2 to see what is the true issue.

@KBMOTORSchannel 4 жыл бұрын

STΔR- LᎾRD I’m trying to diagnose my Jeep Grand Cherokee right now! I could have sworn timing issue as it sounded the same way! For some reason my fuel system isn’t holding pressure with no leaks!! Even pulled injectors to look for one stuck open. Nothing lol. But you said timing lol that was my first thought as well with chugging and popping

@rrmech11 6 жыл бұрын

I love your channel. Can't wait for part 2. Yes pressure transducer shows how the engine is breathing. I was fortunate to be trained by the best. John Thornton. Guru of in cylinder pressure testing.

@j.cooper2246 6 жыл бұрын

Great video Dr. O. Know you have peaked my interest. Don't keep the public waiting ,we want the rest part 2 and we wanna see carnage!!!@Don't keep me in suspense all weekend. Chop chop, get those little fingers working and upload part 2 brother. All the best to you and yours thank you for the video .

@kyhomegarage3430 6 жыл бұрын

This was excellent explanation and use of pressure transducer Eric. Thank you so much for taking your time to share your knowledge with us. Cheers

@toysareforboys1 6 жыл бұрын

Love the live screen recording!!! Stepping up your game man, FLAWLESS! 21:25 is PERFECT!!! Your face beside the screen capture explaining it. Only thing that would have been better is if you could have drew a line on the screen showing what the normal waveform exhaust bump should look like. Awesome work Eric.

@curtisroberts9137 4 жыл бұрын

It really is amazing how clearly you can see mechanical things happening with electronic test equipment when you learn how to use it and how much time it can save you. Especially if you notify the customer and they decide they're going to get rid of the car and now you have junk torn apart that you have to put back together versus just pulling some test leads off the vehicle.

@jgriff3218 6 жыл бұрын

Thank you for your videos. Was having idle issues with my liberty. I was ready to start replacing sensors until I had it fixed. After watching your video l took off the valve cover and a rocker was not sitting on the valve properly. Saved me money and time at the beginning. Turned out to be a broke valve stem.

@arthurfricchione8119 6 жыл бұрын

Great analysis Eric O. Can't wait for part two👍

@Sandbag1300 6 жыл бұрын

That very advanced diagnosis is not something everyone can perform! Well done. Thumbs up video.

@Doplar12 5 жыл бұрын

We've seen you overlook the obvious on occasion, for which you always chastise yourself, and on occasion forget something. But wrong, never. You are the master of masters, Eric.

@PineHollowAutoDiagnostics 6 жыл бұрын

That Pico waveform was so cool! Awesome diag, Eric, would not have thought that a companion cylinder could affect the relative compression waveform like that...definitely learned something new :)

@SouthMainAuto 6 жыл бұрын

Would have been cool to pull out 1 and 3 plugs and redo it. Would have blown minds to see a "normal" cranking waveform with no plugs in it :D

@PineHollowAutoDiagnostics 6 жыл бұрын

Wait I have to think about that...damn you're right...mind blown haha that would be epic xD

@walkercolt7926 2 жыл бұрын

i know im asking randomly but does any of you know of a trick to get back into an instagram account..? I stupidly lost the account password. I would love any help you can offer me

@walkercolt7926 2 жыл бұрын

@Soren Erik i really appreciate your reply. I got to the site thru google and I'm waiting for the hacking stuff atm. Seems to take quite some time so I will reply here later with my results.

@walkercolt7926 2 жыл бұрын

@Soren Erik It did the trick and I actually got access to my account again. I'm so happy! Thanks so much, you saved my account :D

@joe2mercs 6 жыл бұрын

Eric O, a great diagnosis. Right here is where having the right scan tool, understanding how to use it and understanding what it tells you is so important. Twice I slapped my head. First was when you surmised that the high current draw was due to suspected exhaust valve failure to open on paired cylinders and the second when the pressure transducer profile revealed the second peak during exhaust stroke. My ‘dial on hose’ compression tester would say good compression on all cylinders. I guess the ‘popping’ of compressed air back into the intake manifold is a further clue but it’s significance is with the benefit of hind sight

@baxrok2. 6 жыл бұрын

Sputterin', bangin', poppin', my kind of video! Sweet diagnosis and explanation. Thanks Dr. O!

@SAAutoRepair 6 жыл бұрын

You're shared time and knowledge is always appreciated my friend. My AESwave shopping cart continues to fill

@rtchrg440 6 жыл бұрын

Wow, awesome info Eric! Loved seeing the pico relative compression and pressure transducer tests

@patrickmorrissey2271 6 жыл бұрын

Very nice.... I followed your explanation perfectly.... "Hold on, I gotta think about what i just said...." That was me, working late at night, when I'm too tired..... A couple of colleagues seem to think I'm very very funny when I'm too tired, and I'm trying to work.... Gave me a big laugh.... I guess that's what I look like. I generally am not amused, when they think I'm so funny.... Watching you, I see how it could be funny, I guess....

@renderingrocks 6 жыл бұрын

One of the best diagnosis yet. Impressive use of the noodle!

@moldingpro7208 6 жыл бұрын

I love to watch how you work things out. You are an automotive savant.

@snakeskinproductions7500 6 жыл бұрын

Nice Diag. my friend, and thanks for the files. I have been wetting my feet with the scope and Pico software when time allows at my shop. Yep boss is one of those guys all about get it out quick. He would rather shoot the parts cannon at something then spend the time pinpointing an issue. I do it right anyway (shhhhh). Keep them coming brother.

@SouthMainAuto 6 жыл бұрын

I'd much rather have a guy make the right call the first time instead of "being fast." Fact is, you could have told your boss in one hour, 100% what was wrong with this car :) Remember, your tool box has wheels on it for a reason.

@DylanRabier 6 жыл бұрын

Awesome video Eric! Love the Pico with pressure transducer. Big thumbs up 👍👍

@jeffryblackmon4846 6 жыл бұрын

I like your style of starting with basic measurements. Great t-shooting. It will be very informative and interesting to watch the followup video.

@shaunsautorepairs5410 6 жыл бұрын

Interesting stuff eric O... Having just purchased my 1st pico im loving all the scope work..thanks a lot... Looking forward to part 2

@bobflannagan7262 6 жыл бұрын

Just great stuff, Eric! Like a detective story. Also could test your theory by removing the #4 spark plug and then the starter current for #1 would return to normal. You love your trade and want it to be practiced well. Thanks.

@DocFeelGood4 6 жыл бұрын

Damnit man! I cant say enough about your diagnostic procedures. While i have plenty of my own automotive knowledge, im currently in school for diesel technician and what im learning is the difference between a good tech and a bad is how they diagnose.

@alastairstirling8121 6 жыл бұрын

Can't wait for Part 2..!! 😎

@ericcorse 6 жыл бұрын

Let's hope there is one.

@cookscustoms4787 6 жыл бұрын

Yup now we wait for the customer to say open it up . Great video as always!

@petrocksgarage 6 жыл бұрын

Cleanest used/broken motor I've ever seen! Could eat off that intake manifold. Wish mine were like that. Damn, now I'm hungry.

@jesseb2023 Жыл бұрын

good video, ordered me an upstream. not just youtubers, actual mechanics sharing valuable information, thanks

@richard1835 6 жыл бұрын

Great Video. Love the Diagnostic Stuff. Worked on a Jeep Commander yesterday. Keep up the good work. Thumbs Up!

@62ejo 6 жыл бұрын

EXCELLENT Part 1 VIDEO, Waiting for Part 2 Video in all 1,2 's Excellency... Thxs Eric..

@wardybasher 6 жыл бұрын

Perfect advert for the Pico. Brilliant diagnosis !

@sharedknowledge6640 6 жыл бұрын

Nice video! Not knowing typical peak starter currents I would have suspected 4 low compression cylinders and been dead wrong. Your experience once again pays off. You could have, however, just pulled those 2 plugs and re-ran the relative current test. That might have sucked some crud into the cylinders but would have been just as definitive.

@Bekim8310 6 жыл бұрын

Mini series!!!! Now the fun begins. And hopefully we'll see some nuts and bolts action too!

@IceBergGeo 5 жыл бұрын

I really like this diagnostic stuff. Really makes you think. Kind of like the Mike Rowe podcast, the way I heard it. Always reveals the answer at the end, but makes you wonder, until you hear a certain clue, and know what it is.

@JOHNPHUFNAGEL 6 жыл бұрын

To the inexperienced person doing a relative compression test with voltage instead of currant could have really gotten screwed up by thinking all the other cylinders were low instead of the 2 cylinders being to high. Great diagnostics Eric hopefully with you, Keith, and Paul I can be that good someday.

@gravit853 6 жыл бұрын

Great video Eric! Thanks for uploading the pico files!

@bradhall7855 3 жыл бұрын

Wow, this makes me look at the mechanics of an engine in a new light!! Awesome!!

@jannepo 6 жыл бұрын

Brilliant work Eric! Also really liked the inserted screen captures.

@troykidd3232 6 жыл бұрын

I was thinking you were gonna say it jumped timing the hole time after you scoped it. Great diagnostic work as usual 👍

@Diagnosedan 6 жыл бұрын

I'm impressed Eric, Great Video! Smart thinking👍👊💪

@jakeford1570 6 жыл бұрын

Wow I understood everything you said, which is really saying something because I’m dumb as a rock. You are a great teacher! I don’t know why you do this but thank you so much for doing what you do.

@DaveSender66 6 жыл бұрын

One of your best videos ever!!!

@brucel.6078 5 жыл бұрын

Damn ur a genius!! I love your thought process and proving your suspicions through technological means.

@ouch1011 4 жыл бұрын

Pressure transducers for the scope are a game changer. Replaces 4 tools, compression gauge, vacuum gauge, leakdown tester and timing light...and that's just by using it for in cylinder testing! Dooesn't even include using it on the fuel rail, transmissions, engine oil, etc. Definitely a must have for advanced diagnostics, or even basic stuff. There are some vehicles that I use my scope, ignition pickup and pressure transducer to check the ignition timing.

@wanderer6510 2 жыл бұрын

Love your break down on your diagnostic thinking, its like a master class of a who done it for engines. My only wish would be to see a properly working cylinder go through its paces to show a comparison. I guess I could imagine what it would be but the thought went through my brain when I saw the one with the sticking exhaust valve. Love your video's , I honestly think your prescribe to the Kiss method, you take a complex situation and break it down so dumb guys like myself can catch up to your thinking. Thank you. It gives me hope that some day because you can do it, so could I.

@petes8849 6 жыл бұрын

Excellent call Mr O. An alternate way of proving your theory might have been to just remove one plug from a cylinder believed to have no exhaust valve. The relative compression test should now show one of the high current spikes now become normal.

@SouthMainAuto 6 жыл бұрын

100% correct

@adamraddatz1820 6 жыл бұрын

Thanks for yet another well made, informative and interesting video. Excellent diagnosis and use of time. Way to put the customer first by not firing up the parts cannon Immediately and bombingb that engine back to the stone age! 😁

@-BuddyGuy 6 жыл бұрын

I've seen up to the diagnosis of the exhaust valve not opening, now I'm excited to see what it looks like mechanically - and if exhaust shooting out the intake during the valve overlap did any damage while it was running (which you can see with the steep drop after that second 150psi peak in pressure) - edit, you talked about this literally 5 seconds after I unpaused the video lol

@MaicSalazarDiagnostics 6 жыл бұрын

Very good explanation Eric. Thx for sharing your knowledge

@FortyTwoAnswerToEverything 6 жыл бұрын

Awesome, love the new "screen grab" feature, sort of like Louis Rossmann channel does for his Apple repair videos

@nhra7110 6 жыл бұрын

awesome diag as always. looking forward to Part 2

@Kim-n-Brian 6 жыл бұрын

Nicely diagnosed and was very interesting... another great video !

@mikehartmann5187 6 жыл бұрын

My sister, who is currently having intermittent issues with her ‘ 05 Highlander shifter release (suspected brake switch issue) and frustrations with the stealership mechanics, just referred to you as “the car whisperer”. Yeah I like it - South Main Auto, the car whisperer. It sings! No “There’s your problem lady” for her yet.

@hmech61 6 жыл бұрын

This posted at 2am? Thank you for your hard work on your videos.

@racerxnk 6 жыл бұрын

Great diagnosis and explanation of your findings. Professor O'

@jcurran2414 6 жыл бұрын

Nicely Diagnosed Eric. Scanner Danner would have wrote an Novel, and a Sequel about it, and that's before lifting the Bonnet.

@sandyande 6 жыл бұрын

Fantastic training video Mr O very much appreciated cheers sandy

@kylerf150 6 жыл бұрын

100 thumbs up if I could!! I love watching you go through the diag process!!!

@evgenyk5354 6 жыл бұрын

Can't wait for Part 2

@Joe_HamRadioGuy 6 жыл бұрын

Great explanation Eric thanks for all you do. Waiting for part 2 now grr hate waiting haha

@brianmulligan6239 6 жыл бұрын

Thank you Mr. O! You are my favorite teacher . 🍎

@jamesvozar1 6 жыл бұрын

Awesome channel mate great work, very unique to you tube, in the way your present the videos.

@Ashroyer86 6 жыл бұрын

Dang bro I got excited and made conclusions before I watched the part of the video where you called the valve issues. Good call.

@jonmatney9584 6 жыл бұрын

These are good vehicles if taken care of. I have an 04 with 120000 miles and runs like a champ still.

@ralfsautomotive 6 жыл бұрын

Once again nicely done.

@anthonyperrotto4412 6 жыл бұрын

Best video yet Your methods rock!!!!

@609enduro 6 жыл бұрын

Weird how sometimes when a problem is occurring and you know what's going on but yet it's hard to put it into words. You can see the thing playing out in your head like a bad trip (or good trip)... I struggle sometimes when my apprentices are like hey bra how did you know to check that and I'm all its the chi young man. The chi told me. Haa. I'm an electrician with 22 years in so I dig on your wave forms. Troubleshooting is troubleshooting no matter if its a building or a washer or a pooched jeep car. Keep on Keepin' on bra

@chungaleta1234 6 жыл бұрын

Yeahhh I'm finally understanding this sh**t ..and I'm loving it!!! Looking forward to the second part!!!!!!

@yamahattr6006 6 жыл бұрын

Excellent video all the best from the UK 🇬🇧

@rust2985 6 жыл бұрын

Hey! I don’t know how I missed it when this was released, but I sent you that Icecream lover dr sticker. I had a good laugh seeing it in the video...

@ozzstars_cars 6 жыл бұрын

Professional tools and knowledge for the win! Nice job pinpointing the problem Eric. Sometimes you really surprise me. haha

@SouthMainAuto 6 жыл бұрын

I try to remember all that you taught me but man, it is a lot to take in.

@chrisfreemesser5707 6 жыл бұрын

Awesome diagnosis...and very educational! And yeah, NGK was (is?) the OEM supplier of spark plugs for Chrysler products...mine has them.

@TehScotsman 6 жыл бұрын

Chris Freemesser the majority are champion, but I believe some engines were ngk. I work in a Chrysler parts department and every one we stock is a champion with a mopar logo on it

@SimplyDiagnostics 6 жыл бұрын

Excellent use of the WPS 500 Eric 👍 #picoflu once you have Pico it’s more infectious than influenza, you just want everyone to have it 😂

@SuperJoes70 6 жыл бұрын

I can't wait for the final verdict on the edge of my seat ... call the customer maybe part two on Monday am another sleepless night ... good video

@soundrecordings2659 6 жыл бұрын

Making the Call, new favorite phrase!

@fonzo2525 6 жыл бұрын

this video went perfectly with my coffee and donuts,thx mr o.

@NewLevelAuto 6 жыл бұрын

fonzo2525 🤗

@tam1381 6 жыл бұрын

Toast banana and peanut butter with a plate of homemade soup.

@jahdaim9360 5 жыл бұрын

Dang man ur a wiz at diagnosing cars.. Right on Eric 👍

@tomdewey9907 6 жыл бұрын

Eric, it looks like you have a new video camera, much better clarity with this vid; keep them going... :)

@majwor3763 6 жыл бұрын

I see the Christmas tree on the dash is ALL LIT UP for you!

@Chris_905 6 жыл бұрын

Pure brilliance , you sir are the man !!

@jason-ge5nr 6 жыл бұрын

eric is a wizard of smart on the engines.

@philmerrifield1163 3 жыл бұрын

This is the 12th South main auto repair video I've watched recently and I'm 12 for 12 on the diag, quite chuffed 😁

@mariodonaciano1351 6 жыл бұрын

i'm working on a dodge nitro with the exact same symptoms. i checked engine vacuum and i would get about 5 in of vacuum, and i had 150 psi of compression on all cylinders.