Troubleshooting An Intermittent Idle Only Misfire (Dodge Durango) Part 1

[@Diagnosedan]

Gas analyser reading 27.3% Oxygen in the air🤔 Tell Danner to get it calibrated😉

[@billrimmer5596]

Nice to c DD here. Never miss an SD or DD video. DD fixed it again!!

[@EKHondaMotive]

Good eye! Great catch!😁👍 -100

[@ScannerDanner]

🤣 nice

[@thisisyourcaptainspeaking2259]

Air is 21% oxygen, mostly N2 (78%)

[@eugeniujosanu279]

The " computer guys" working toghether, Nice!

[@chrisdavis8299]

I actually learned a lot from watching you perform all the various tests! So not a total waste of time brother! Thank you for everything!

[@grandsea2]

Always good to see that even World Class Tech's like yourself get tripped up scratching their heads by the new part bug sometimes...just proves your human still! Thanks for sharing!

[@Joseph-xx4fd]

Dealt with this exact misfire, exact engine and vehicle. The 3.6 pentastar engines from Chrysler are notorious for roller rocker failures. Just like your coil primary tests it didn’t show in the waveforms I captured. I ended up seeing the excessive “turbulence” at idle in the secondary waveforms caused by improper intake valve seating from a failed rocker, pulled valve covers off and found the rocker took out the cam lobe. On some of your captures you can see the “turbulence” at idle in the secondary burn. Hope this helps appreciate all that you do, I’m a premium member and love the content👍🏼

[@kolton5543]

It's kinda crazy how inconsistent the misfire symptoms from failed rollers are in these 3.6Ls. I had one in a caravan about a month ago. Had a dead miss at idle on #3. Found an intake rocker with just a tiny bit of slop. I thought surely it couldn't be the problem. Replaced it and miss went away. I have a Journey in the shop right now with a small miss on #1 at all times. Intake cam is wiped clean. One valve opens half way and the other doesn't open at all. But only a light miss. Had a Chrysler 200 a while back. Had dead #1 miss at idle and cruising but was fine under load. Again, intake cam lobes were totally wiped clean. Both valves barely opened at all. It seems like every one of them misses differently and the worse the cams are, the better they run.

[@ScannerDanner]

The excessive turbulence you mention is not what we were seeing during the misfire 😉 While I agree, that can happen, but when a spark line completely disappears like we had, this is never from a mechanical or fuel problem. Thank you so much for helping me do what I do. You guys (premium members) are the reason I still produce content here and don't ever ask for donations to the channel. I'm forever grateful.

[@ScannerDanner]

@@kolton5543 i bet in your examples, cranking compression tested good too! But this is where secondary ignition was so valuable here in my case. Also wiped lobes can be caught using an intake and exhaust psi transducer and of course a running compression test, but when the intake covers the cylinder that you need to get to, the psi transducers i mentioned would have been the key!

[@kolton5543]

Yep. Both the chrysler 200 and the caravan had both good cranking and running compression. Nothing noticeable with a mechanical gauge at least. Unfortunately I don't have a pressure transducer for my scope. I'd like to get one sometime. Might make diagnosing valve train issues a little easier on these 3.6Ls

[@tracydiller9378]

Intermittent problems is a pain to begin with but going thru the troble shooting you did led you to the problem.Great video as always.Stay safe everyone.

[@speedy_pit_stop]

I waited days to finally have time to watch this one. Glad I did. It's not as fun when the diag is too easy.

[@CumminsDriver100]

I cannot STAND getting bad new parts. When I first started working on vehicles my brain would automatically convince me that no, it can't still be that because its brand new if the problem remained. Led me on many ghost hunts that I learned the hard way from.

[@T-Hogie]

Really enjoy your videos. I used to have a 2002 Chrysler T&C that developed a really bad multi-cylinder miss fire. It started as a single cylinder miss fire but after a particularly cold night it became many cylinders (almost all) miss firing. Turned out the wiring harness for the fuel injectors came loose from its support and fell down near the exhaust manifold and melted the insulation on the wires and they shorted together. It was a mess. I had to use a heat gun to separate the wires and then cut out the bad section (about 4 to 5 inches) one wire at a time rejoining them with butt splices and solder with heat shrink over them. After I got done with it the harness still reached to where it needed to plug in and was now too short to get too close to the exhaust. Car ran great after that. Apparently this was a fairly common problem.

[@silvergate8952]

Thank you great description of my problem too

[@bm3772]

Had the exact same issue with a secondary ignition misfire. On the same SUV it Keep sending me down the wrong rabbit hole. Sounding board is good to have. Thank you it was very helpful ASE Certified Chris

[@benclark1113]

Awesome video! Learn so much from you! Had a similar issue with my wife’s 3.6 pentastar a couple years ago, it ended up being 1 failed exhaust rocker arm on misfiring cylinder. Wasn’t making a sound!

[@thesmartguy3523]

Had a similar case with a Yaris 1KR, misfire was only at idle, at higher RPM, no misfire, no fault codes, all tests passed, turned out to be a damaged intake valve.

[@THERIDESHAREMINUTE]

Just went through this with a 2018 caravan light misfire when cold but after several hours chugging at certain speeds on highway. After spending 1500 full coil plugs all gaskets. Still check engine light would not stay off. P302 permanent code. I took what it was gonna cost to keep chasing the misfire and went to the dealer and just traded it in. Got an earlier model, less miles and no check engine lights on and a 4 year 80k warranty as my vans warranty expired during the pandemic. These 3.6 engines are really good as long as the problems don't start popping up.

[@mypony7310]

I did one 6 months ago. 3.6 chrysler. Ended up being the cylinder head. A cylinder leak down test showed it pretty quick. The new head from chrysler was only like 350 bucks

[@Portuguese-linguica]

Ya the head was only 350.00 but labor and taxes plus other hidden fees more along the lines of 900 to 1,350.01

[@carloshernandez2216]

There is a TSB for this problem in bank 2, they even extended warranty to a 150k miles

[@THERIDESHAREMINUTE]

​@@Portuguese-linguicaexactly. So I just went through this for the 2nd time in less than 3 years with 2 different caravans my 2016 and now 2018. It was easier to use the 1300 bucks for a down payment and buy another one that comes with a 4 year 80k mile warranty. Case closed. Piece of mind for the next 3 years minimum.

[@htownblue11]

For an experienced diagnostician, a first instinct is usually a good idea as to where to start, but the goal must always be to let hard factual data / input be the final diagnostic end all. Process of diagnosing is part science, part instinct, and part experimentation. Read the plug and boot and replace accordingly.

[@ScannerDanner]

Unfortunately upper intake removal is necessary to gain access to the coils and plugs, but you are correct and I'm doing everything I can to prove whether or not I need to do that 😉

[@weshawkins7165]

Excellent who done it video. I’ve use my older A/C hydrocarbon sniffer for the same test.

[@shawnhimel1969]

Great video on the total diagnostic process, lots of great testing. great job Danner, great editing too...😁

[@mauriceorduna3564]

Just had one of these..same motor same symptoms. Referbisded the heads and found the exhaust valve on cylinder 1 was stuck. Code P0301 Replaced the valves too. That got rid of the misfire. I also thought it was ignition related. Thats what it feels like. Little rumble coming from driver seat.

[@haakanlight9661]

just got the fuse adapters from AESwave myself. Awesome tool to have.

[@Paul1958R]

Caleb, James, Paul Great analysis and video - thank you! Let us know how it ends. Paul (in MA)

[@wmwil2564]

You got so many tests at your disposal it's all about picking the right one

[@ScannerDanner]

Exactly!!

[@jonny8813]

Hey off question, what 5 gas analyzer set up was that?

[@ScannerDanner]

PA state emissions machine. One of the few tailpipe test machines left here.

[@jonathanbarnes3792]

Was surprised how low statistic for cylinder head was on the repair ranking for the P0302. I was getting tons of compression loss diagnosed for case study results when I had a Grand caravan here with same code, same engine. I was losing sealing of exhaust valves on my customer's 3.6/cylinder 2 as well. Anyway looking forward to the update. Thanks for taking us along on the struggle with this one.

[@Premier-w3k]

SD, pls keep us updated on fixes and what the other shop missed plus what type of spark plug used and ignition coil if feasible. Sometimes aftermarket parts don’t play very well engine management system. Thank you sharing this video.

[@normangallant9879]

Wow what a find.True at times new stuff can be the culprit

[@JamesSmith-xs7sr]

Had 2 of those 3.6 with int misfires due to faulty valve seating. Many had recalls for replacement cylinder head. Both vehicles had misfires on the front center cylinder. Last one sounded normal during compression cranking (sans gauge) but ended up with only 60 psi with compression gauge attached.

[@nemanjadzombic6101]

Thank you for another perfekt video!!! I know I would struggle with this one. Actually because it's 2 wire COP maybe I would not, but if it's 3 wire and I can't see secondary, that would be a huge struggle. I mean ignition related misfire on idle and not at load... how often do you see that... If it was 3 wire COP, the way to go I think would be to swap that number two coil and plug. But as I said, idle only misfire would put me far awy from even thinking that direction. Greetings from Serbia.

[@luismarty1685]

Hey Paul. You are the man. Keep up the good work Kaleb.

[@godfamilycountry4211]

Secondary ignition problem? I need to do a little research. Great video guys thx so much

[@robertnicholson8054]

Interested in part 2 also. Saw which I didn't know in petrol injector engine. You have to balance reset all injectors. As timing slightly out. Can only be done on expensive scanner tools not a self DIY 😒. Good luck from Capetown

[@dugy40]

sometime when u get a little time can you explain what your listening for when u hold the pedal to the floor and try and start it?

[@ScannerDanner]

Watch the first part of this video kzbin.info/www/bejne/a5qQp5SOiMqooac I go over it in detail

[@blakeknox6178]

Just curious, if it was a bad coil or a plug, my guess it has a bad lifter, or a rocker arm, or cam lobe, I worked for a Chrysler for the past 15 years, thanks always looking for new info

[@ScannerDanner]

I'm pretty sure I proved the fault in the waveform of the secondary.

[@knock904]

I see u taking the tips Scanner ..u are awesome .gotta keep us sumth 2 click on

[@faustogonzalez8397]

Thanks Paul , as always AWESOME video !!! keep up the great work !!

[@steveguest8028]

Great video this is Paul i have been caught out by this before, had a vauxhall with a dead misfire on cyl.2 put a coil pack on it and the misfire was still there and STILL on number 2 cyl. Would you believe it was a faulty coil pack causing the misfire on the SAME cylinder …. Crazy stuff man

[@okhotrodder]

I've been working on an '19 3.6 for a couple weeks. Swapped parts several times. Dealer said camshaft and rockers. Still have a idle miss that gets worse and worse as it warms up. New lash adjusters, rockers, camshaft, injectors and coils. Still has a miss. Compression is good, all wiring was checked. Just at a loss. When I pulled the cam, left exhaust, it did look bad and I was sure that was the issue till I replaced it and nothing changed. Solus still shows #2 secondary miss fire. Swapped plugs and coils and nothing changed again.

[@ScannerDanner]

you need to do a running compression test. It is common to have good static compression and have poor running compression from a valve issue. And it will also be an idle only type misfire. An in-cylinder pressure transducer on a lab scope would be ideal, but you may be able to catch it with a regular gauge

[@fulano787]

Pentastar 3.6 is known to have poorly machined valve seats. Results in cyl 2 misfires. There’s a recall for it. That’s why it’s the first recommendation in the troubleshooting tree. I have one in my wrangler and it had to have the cylinder head replaced under 5k mi

[@amr-50]

That was a great one danner you are a star

[@JAKEaudio2]

Great video as always. Question: What solution are you using in the spray bottle??

[@eddiereichel9354]

I went through a 6 month nightmare on one of these. It also had cylinder 2 misfire and it had a new coil and spark plug in cylinder 4. I found cylinder 2 low on compression. This was last year around july and I ended up finding low compression on cylinder 2 due to valve sealing issue. Burnt exhaust seat. I get it back together after waiting 3 months on a cylinder head from Mother Mopar. I even took the old head to a machine shop and they could not get the valve seats. So I get it back together and its tapping from the rear of the engine. Its my own fault for not hearing it in the first place but It ended up being roller rocker failed.

[@timhanialakis8269]

Sounds like it will be back for a rocker arm. Super common I used to replace these rocker arms weekly ( 10 year CJD master technician ). Normally the exhaust rocker arms would make no change in sound when they fail.

[@ScannerDanner]

Someone else mentioned an engine noise too and this engine had zero mechanical noise from memory. I believe the camera mic was picking up the injectors in a few shots as it was attached to me and I was leaving into the engine bay

[@daveunbranded]

I have the same motor. I reused that intake gasket 2 times. I know it says you can't. But I had no issues

[@kevinfrye1822]

I seen people say cylinder head and there was a call back / service bulletin on the first 3 years of the production of the pentastar 3.6 l cylinder head causing misfire on the #1 bank but it's usually all 3 cylinders on that bank. They ussually fail a cylinder leak down test .

[@JDgomez001]

What kind of scope he used at the end? To check the formware of coil ? I need that tool 😂

[@ScannerDanner]

Picoscope I believe

[@johnjohannemann1220]

Excellent presentation and diagnosis as always 👍🏻

[@alexisjohnson9608]

Hey Scanner Danner awesome Tec videos you can reach a larger audience here on KZbin I miss the Hands-On back in the old class days at Rosedale continue to share the knowledge God bless take care

[@ScannerDanner]

Is this my friend Alex? Former student at RTC??

[@alexisjohnson9608]

@@ScannerDanner yes sir it IS my friend Paul.

[@alexisjohnson9608]

@@ScannerDanner yes it is me my friend. Good to see the videos AND to hear from you.

[@ScannerDanner]

@@alexisjohnson9608 oh man! It is so good to hear from you my brother. I miss you man. It has been a really long time. I hope you are doing well and your spirit is well too. It certainly was not the last time we spoke. May the God of peace be with you every single day. Are you still local?

[@alexisjohnson9608]

@@ScannerDanner hello brotha Paul good to hear back from you. I'm doing well thank you. It has been to long brotha. Searched hi and low for you man and then just decided to leave a comment and pray 🙏 you would read it and reply. You looking huge man and good to see u and ur son working together on different projects. Hopefully one day we can get together so we can catch up even more my brotha. Stay Strong and keep up the good work.

[@James-fs4rn]

👍 can't get enough of this channel. Can the secondary ignition waveforms be used to indicate the condition of the spark plugs? Thank you!

[@ScannerDanner]

Thank you! Condition as in wear or an increased air gap? It would be hard to pick that out but it would increase your firing line a bit. But if the plug is open or shorted, yes, you'll absolutely see that in the waveform, but further investigation would be needed because a bad wire or coil can look similar

[@James-fs4rn]

@@ScannerDanner Copy that. I was thinking of a coil on plug setup to judge if it were time to change the plugs. Thanks for the lessons!

[@ScannerDanner]

@@James-fs4rn got it, and yeah, when I see a messed up secondary waveform, there are times that I cannot differentiate whether it is a bad plug or coil, so I move coils and plug around when possible

[@josephbragg1162]

Your the coolest. My question is my truck has a number 3 cylinder misfire and same thing goes a bunch of stuff had been changed out basically throwing money at it changed the plug wire and it's a 96 Chevy Silverado 5.7 c1500 and I was thinking the same thing, did I just get a bad plug or a bad wire but I have yet changed them out again to test that but I was wondering if an ignition coil for that truck could possibly just cause a number 3 misfire? Just curious as my brother is a mechanic and been doing it for like 38 years and he's always busy training other mechanics and working as a recon manager for a dealership. He gives me help when he can but I wanted to kind of see what you think. Ignition control module was changed out IAC was changed out TPS was changed out cap and rotor was changed out but it's just a misfire on cylinder 3. I was leaning toward injector and if it is the injector or spider injector system I was going to get the upgraded injector system anyhow because the original spider injectors on those trucks actually kind of suck and plug up fairly easy with this crappy gas we have these days. I used to run non-ethanol gas in it but because of the prices I now run 87 and then an injector cleaner which I may be wrong for doing this in the first place. Great video though I love it I've watched two of your videos so far since I come across you and you really really know your stuff pretty well.

[@ScannerDanner]

check compression on that cylinder. search "relative compression sound test" on my channel. Easiest one to do

[@joemichael3656]

Found idle miss fires on some ford 3.0 liter 4 valve engines to be burned exhaust valves, usually you can hear it while cranking but got fooled by that because it was so slightly burned and the misfire monitor was picking it up. Also found 4.6 liter engines with head gasket leaks into the cylinder and would miss when cold, took a while to find put the pressure tester on and let sit overnight pulled the plug and found slight amount of coolant on the center of plug.

[@davidraezer5937]

Curious to know if it was a OEM coil used or aftermarket or maybe they used anti seiz compound and got some on the porcelain. I wish I still had access to a 4-gas. Block tester works most of the time.

[@eugeniujosanu279]

Had a missfire only at idle or stop lights (park or drive idle) . Was driving me crazy since I know most of the stuff is new , turned out to be one spark plug (all replaced with new ones ) . It got a small crack on it. (No eng light ) New parts going bad in minutes can drive you clueless really fast .

[@isalmankhan1]

Superb👍 Thanks for sharing SD, Love it👍 The best part is your cool tool's arsenal😎 The outro was awesome, great job Caleb😉 Stay Safe Guy's❤

[@ScannerDanner]

Glad you enjoyed it, just read this comment to Caleb :-)

[@isalmankhan1]

@@ScannerDanner Thanks a lot SD, this is a huge compliment for me😍 You're my mentor, Love your work always, what I've learned from you is unimaginable👍 Stay Safe & Blessed❤

[@jorgegonzalez-bk8zn]

Happen to probably all of us before if there if there is a new part that is the last part in question but so many aftermarket parts fail

[@Steven-mh9gc]

I agree with the techs that are suspecting cyl head. Have had several myself that failed cyl leakage tests. Known problem with 3.6 liter Chrysler penstar engine!!!

[@DANNYN224]

Nice video hey Danner I don't know if you can help me I have a 1997 Nissan Altima 2.4l with 87,857 miles the problem is I have a intermittent rough idle or idle surging I have cleaned the mass air flow cleaned the throttle body this one has a tps sensor and put an new air filter installed a idle air control valve check for vacuum leaks had 2 cracked hoses fixed it also the intake manifold gasket looks good and checked fuel pressure it was good the fuel pump was replaced a couple years back it still has the problem when I put it in drive or put load on it feels like it is gonna stall out and no check engine light

[@kolton5543]

As crazy as it sounds, I've seen a few older Nissan have surgine idles caused by bad battery terminals. Make sure they're clean, tight and the cables are in good shape. Also, if I remember right, they have a minimum throttle position relearn procedure that's supposed to be done after messing with the throttle body or IAC. I don't rember exactly how to do them though. It's worth looking into and it cost nothing to try it.

[@ScannerDanner]

What are your fuel trim numbers during the rough idle and when it's not rough. Do the water test i showed in this video. Intake gasket leak is a common problem and you may not find it with a hot engine

[@DANNYN224]

@@kolton5543 but it is a 97 isn't it old I don't don't there is a throttle body relearn

[@kolton5543]

You'd be surprised by the stuff a car can do in 97. It's not a throttle body learn but a minimum air flow learn. The ECM needs to know the limits of the IAC and how much air is flowing into the engine at those limits for it to properly regulate the air flow. I'm not saying it's your problem nor am I saying it for sure has a learn procedure for it. I'm not super familiar with the older nissans. All I'm saying, I'm pretty sure I remember dealing with a similar issue a while back and I think that's what I had to do to fix it. It's been a while though and I tend to forget things after fixing another 1k cars.

[@Kota_Bear]

With that misfire check engine light did you have the stop/start warning light come on as well? I'm chasing a similar issue but the S/S light comes on too.

[@filmaker256]

Intermittent idle misfire My carmy 98 seems to have that , well only when hot outside. It will go away and stay away after that . I keep hearing IAC valve is the culprit for my car. I do have the intermittent lean bank one occasionally however.

[@ScannerDanner]

Definitely not your IAC with those symptoms.

[@filmaker256]

@@ScannerDanner Hey Danner! I am scared to ask , but if you took your best guess with my car symptoms ... what would it be? I do alot of stop and go driving if that helps? Insert bad news below

[@ScannerDanner]

@@filmaker256 too hard to say over the screen here my friend, but the intermittent lean condition code you are getting along with the misfire symptom could be an injector issue, I'm only saying this because of you car and they are known for injector issues kzbin.info/www/bejne/mGnaqGqigrKjkJo

[@filmaker256]

@@ScannerDanner Thanks for response Scanner. I do have small oil leak on valve cover, not sure why people have said that may cause lean condition but I have heard that. Though I would think most likely dirty injector or electrical problem with injector.

[@codysautodiagnosticsprogra8706]

Excellent video like always Paul

[@JimmyMakingitwork]

Wow. You would think they would Know if the problem started after a tune up to look for bad parts? Let us know.

[@DirtyWorm12]

Hey Dan, ive had misfires with these 3.6 engines and lifters stick and the roller rocker roller itself wears out

[@philh9238]

What about a crank sensor issue? Or a pcm update

[@JoseAndrade-ke4fz]

This is exactly what i needed! Thanks for the awesome video.

[@JoeCnNd]

Wonder if he's going to swap to another cylinder. Edit: in the end I guess thats what he'll do. Lol but I love you did the other stuff to keep it informative. The 1 on 5 might be a false read.

[@kylesalem-fuson8012]

I’ve done 4 camshafts in the past year on these. First one took my lunch. Second I was okay. Third and fourth I just pulled the valve cover on bank 2 and there it was. I can swap a cam on bank 2 in about 45 minutes now lol

[@ScannerDanner]

Problem is the intake has to come off, so all this testing was to prove that is what is needed to continue.

[@kylesalem-fuson8012]

@@ScannerDanner understandable. I don’t personally have a lab scope nor the experience to use one as effectively as you do. But I do have a fair bit of experience with those 3.6 pentastars and can have that plenum off in 15-20 minutes lol so I go with what I know

[@verohandymike]

28:39 Actually the very first thing I've ever done when one cylinder is misfiring is to swap coils and plugs to see if the misfire follows them.

[@kicknsystm]

I couldn't quit looking at that red Camaro. I used to have a 76 same basic color.

[@Volusiaev]

@ 26:05 Grammy Danner must really be praying for you, Paul, LOL

[@ScannerDanner]

🤣🤣 I'm dying, yes she absolutely would be for that rant

[@tcifusion4497]

FREAKING LOVE THOSE CASES....THE ONES U THINK U GOT IT!!DAMMMMM I LOVE THEM......

[@Dragonchi1971]

What is the "ticking" sound coming from? There was a time our 2011 Durango Express 3.6 ran smoothly, always using premium fuel here in Georgia. Now, at 167,000 miles, it's making the same "ticking" sound as the one you're working on.

[@sixstarauto]

Get it all set up, won't break, story of my life.

[@diamondstateautodiagnostic5250]

Can you check secondary on that ignition system with probing the wires

[@ScannerDanner]

No sir, that would be a primary analysis BUT, the primary does mirror the secondary, so yes, you can do that to gauge what the secondary is doing. This can even be done right at the ECM, since the coils are all hidden. Keep in mind however, that this test can only be done on system with the coil driver located in the ecm or external module. If the coil driver is part of the coil, this signal (coil primary negative control), cannot be viewed.

[@diamondstateautodiagnostic5250]

@@ScannerDanner how would you scope a coil that has the driver in it

[@ScannerDanner]

@@diamondstateautodiagnostic5250 amperage pattern on the primary and then a capacitive secondary probe (like I used here) for the secondary. You cannot physically see the coil negative voltage or control on those as it is in the coil itself.

[@diamondstateautodiagnostic5250]

@@ScannerDanner awesome thank you so much for the info I watch a lot of your videos and learn so much from you Ivan errico at South Main Auto you guys are awesome. I have one more question I'm always afraid to mess up my scope when back probing injectors and coils what's a good rule of thumb for using attenuator I've seen you use them sometimes and then I've seen you not use them sometime so I was just wondering kind of work rule of thumb do you use thank you so much for responding I really wish you were closer to Arkansas because man I would love to work around somebody like you and learned everything I could

[@ScannerDanner]

@@diamondstateautodiagnostic5250 depends on your scope but in general, when looking at coil negative voltage or injector control voltage signal, these will be your highest voltage spikes on the car. My Pico for example can handle a 200 volt spike without an attenuator, so I'll check injectors but not ignition coils without one. My Verus can handle 400v spikes so no attenuator is needed. Some smaller scopes only have a 50v input max, so you have to be careful!

[@michaelshaft07]

Would random p0300 cause same even after packs/ spark plug replaced?

[@ScannerDanner]

Injector and compression issues can cause a p0300, as well as vacuum leaks and headgasket issues

[@lance1097]

We have all been there Paul. Why didn't i do that to begin with. Kicking myself .

[@enriquemartinez7990]

AgainAgain thank you very much I love your videos and it’s awesome when you talk to your brother on the videos it’s a lot of fun thank you very much man God bless you say hello to your brother he’s a cool man👀🌿

[@ScannerDanner]

Glad you like them!

[@justinballard7242]

13:05 good ole 350 vortec leaking around the injector connector. Seen that trick before 😂

[@Pablo_Automotive]

Thanks a lot for this kinds of videos it's really interesting.

[@everythingbutkoi6898]

Great work again

[@jdtractorman7445]

I think try a compression test and leak down test. I saw an engine with a valve sealing issue that had about 125psi and would only occasionally misfire. Had a fubared valve seat in the head.

[@alfee9411]

yep cheap assurance ..had one a year ago that another shop did a used engine and then a coil, injector was bad and smoked the cylinder and i replaced the engine again with all of the goodies. a year later all ok fix it right

[@florenbaron7111]

What is a secondary misfire? I searched on the browser and I didn't see a definition. Thank you.

[@ScannerDanner]

Search primary ignition and then secondary ignition. Or I have some classes on ignition systems right here

[@nightstorm9128]

Is the 3.6 direct injection...

[@M-HWeldingAndMechanical]

3.6 pentastar from Chrysler had a lot of issues with the cylinder heads. They even extended the warranty on those heads

[@MarioDallaRiva]

ScannerDanner Premium members need to hear the unedited audio! 😎😈👌🏼

[@ScannerDanner]

lol

[@kevinfrye1822]

Those 3.6l are known for worn rocker arms causing the valves to not open correctly causing low speed misfired. Long cranking relative compression testing may reveal the mechanical issue of one rocker intermittently binding up.

[@larryreno8293]

But wasn’t this also accompanied by a ticking noise as well?

[@kevinfrye1822]

@@larryreno8293 I've had them not tick and still have a intermittent cylinder miss in early failures of rockers in these specific engines I don't believe that was the case in this video it's been a while since I seen the video

[@larryreno8293]

@@kevinfrye1822 good to know, thank you

[@abonourabonour1006]

Love you ...love you...love you from my heart 💖💖💖💖💖 best teacher in the world

[@ScannerDanner]

Thank you!

[@jamescallaway6263]

I am currently working on 2011 Jeep Cherokee with P0301, P0303, P0305, only misses when warm and only cylinder one is consistent, passes leak down test, compression test, timing, fuel trims all seem correct, does not follow cylinder when doing parts swap

[@logicalguy488]

For the smoker ..... Just so you know, you can use regular baby oil, Johnson & Johnson baby oil makes good smoke. You don't have to use the expensive smoke oil.

[@kas0016]

Yep essentially mineral oil

[@weldingjunkie]

Baby oil stinks so bad it. Mineral oil is way better. Anyone using baby oil def doesn’t use it often makes me sick now

[@tretyakovdenis]

Baby oil smells so bad. I used regular motor oil

[@mypony7310]

Was it a blue streak coil?

[@joe1273]

The rocker arm needle bearings fail a ton, also had a run of leaking valves.

[@scraiga66]

Kinds of sounds like a rocker tick

[@throttlebottle5906]

@@scraiga66 I caught that also, I'm betting mechanical issue too, which explains why it gets better with run time/heat :)

[@ScannerDanner]

No rocker tick. I believe the camera was picking up the injectors on a few scenes. There was no engine noises whatsoever on this from my memory.

[@donwasse7892]

Late to this. When you had your amp clamp + snap-on scope hooked up, the scope was set for trigger. I don't believe you would have been able to see a lack of coil control, had that been the issue. I don't think there would have been any gap in the waveform when zooming and scrolling back. If you had used a second channel for firing order reference, do you think perhaps the ringing (oscillations) in the waveform, or lack thereof could have been useful in narrowing the problem to an ignition issue quicker? Perhaps being able to compare the current waveforms when you know the specific problematic cylinder to the rest of the known good cylinders would have been beneficial? I'm still learning, thank you for your work, I certainly appreciate your efforts.

[@ScannerDanner]

Need a time frame, sorry. It's been awhile.thanks!

[@donwasse7892]

@@ScannerDanner 9:14 you state you're looking for a drop

[@ScannerDanner]

@@donwasse7892 this is an auto trigger, so I'd still see it live, but primarily I'm using the buffer to be able to see it when I feel it. Pause, freeze, then zoom out and you'll see it, regardless of trigger setting. Why? Because I can go back in time and view everything, even if a manual trigger was set, I'd still see it. Hope that makes sense

[@donwasse7892]

@@ScannerDanner I use the snap-on Verus scope at work. I was not aware when in auto trigger the buffer would show only time instead of trigger+sweep, allowing a person to see a gap. In a automotive oscilloscope class I attended, it was taught to never use a trigger if you're looking for a missing coil/injector event, as the oscilloscope would not show data unless the voltage reached the threshold of the trigger. Thank you for your responses, I bought your book from AESWave a few years ago, great book.

[@ScannerDanner]

@@donwasse7892 thank you so much! Yeah, that's actually not true at all! The buffer records everything regardless of the trigger on all of the snap on scopes and the pico! Now when you are "live" you can absolutely miss it, but not in the buffer

[@darrylschuman5373]

Miss at idle only? My first thing would be to use vaccum gauge first for diag. Then i would smoke intake to check for any vacuum leak on that intake run er of missing cyl. I would lokk at plug very closely and then finally do a compression check and leakdown test on cylinder in question. Lean miss on that cyl ??

[@ScannerDanner]

Intake manifold covers the coils and plugs and must be removed so that would alter ones direction a bit 😉

[@JimmyMakingitwork]

Valve seat issue or carboned up valves… On to the video. :)

[@haakanlight9661]

be interested to hear if you do find out the ultimate fix (plug or coil). I've unfortunately been down this road with a number of shops I help and it's often inferior quality house-branded ignition coils that are the culprit :(

[@CubasAutomotive]

I agree.... those aftermarket parts, have burned the shops quite often. To the point some didn't want to replace the parts I called because they "just replaced it". 🤦🏻‍♀️🤦🏻‍♀️ well.... don't know what to tell you then. This is my call. Or continue throwing other parts then 🤷 🙄

[@31terikennedy]

Check TSBs?

[@blakeknox6178]

We’ve done hundreds, of lifters, rocker arms, and cam shafts, for the same problem, especially on the earlier models 20 12, and 13’s

[@ScannerDanner]

Which is why I was shocked when it ended up being a secondary ignition problem. Thanks for confirming that.

[@stanleystickles7703]

Cylinder head. We changed 12 this year

[@alrifainidal]

nice work Mate 👍

[@carloshernandez2216]

Comon problem on cylinder head bank 2 on this 3.6l Chrysler, there is a TSB

[@ScannerDanner]

It's not what you think

[@carloshernandez2216]

I need to see the second part, thank you SD

[@gregoryfairchild2460]

Just started the video. Guessing vacuum leak. Air bypassing creates a lean miss usually. Only have high vacuum at idle.

[@gregoryfairchild2460]

Wow...would've been a tough one

[@gregoryfairchild2460]

I'd like to see a close up magnifying glass inspection, maybe ohm the coil etc. Bad boot? Etc

[@liquidrockaquatics3900]

I’m not a mechanic, but could that be a cracked boot and as the rubber heats, it loses the path to ground and operates properly?

[@m.mooverssr9211]

I always look at mode 6 and ffd look at engine temp

[@logicalguy488]

Another factor is ... New is not always good.