2005 Imprezza Misfire DIY Tricky Diagnosis

[@that_colorado_cement2010]

As someone who has been in the field for almost 10 years as a mech/"parts hanger", you are doing a awesome job and are constantly teaching me things I should have learned years ago. Keep up your channel, you are doing awesome work. I guarantee you are helping people like me(who are too scared to admit it). You are a better technician than 70% of "techs" in the field who shotgun parts in lieu of actual diagnoses.

[@SchrodingersBox]

Thanks man. Pretty rare for someone to admit that so kudos to you!! you’ll be running the show at the place you work in no time.

[@andrewerickson6690]

Gonna have to jump on the wagon here I'm loving the information and it really does help me at work

[@winsoxuk]

So nice to see a video that shows full learning curve. I bet a lot of other channels would have edited it to show that they "knew" that the bigger spark could be incorrect. Love it , correct way to learn.. raw and unedited. Also gives people confidence to ask further questions even if they think they have found it. Excellent

[@SchrodingersBox]

Glad you enjoyed it!

[@bmw-e30]

Ignition coils are easy to diagnose when they fail completely but can be very tricky when they only fail under load or occasionally intermittently under load. Good video tutorial.

[@Johnsmith-zi9pu]

I have spent days watching your videos and taking notes during the lock down ; you are a fantastic teacher. I now feel better equipped to use my scan tool and interpret the data.

[@SchrodingersBox]

You're very welcome!

[@bash6566]

Simply ingenious! Superb diagnosis Sir. God bless you for this and more hopefully coming in.

[@jeremieparker5703]

Brother Matt .. Where have u been hiding Ole Chap? Lol ... Good to see that u are still at it great video man thank u for sharing

[@StarTrekforever3698]

Excellent job figuring that problem out, it was a thought provoking challenge!

[@labradormcgraw]

This video provides valuable supplementary knowledge to the scope training on the paid channel. It also serves as a good reinforcement example for the ignition systems series. Together, these tutorials provide the best auto training on KZbin. Simply unbeatable.

[@SchrodingersBox]

I should hire you as a sales rep for the channel

[@labradormcgraw]

@@SchrodingersBox Haha - that would be great.

[@ignacioromero5014]

You have a definite talent to convey information, I followed you every step of the way, even when you shifted direction. This was a very eye opening one - What you see is what you don't get. Nicely verified tho.

[@PaulyD0859]

Your waste spark coil is internally shorted and breaking down under load, as evidenced by your scope on #3 at higher rpm. It might also account for the bank 2 O2 code, since #4 had a weak spark at idle.

[@davyarthurs]

My thoughts exactly on the o2 sensor code

[@edwardjames6070]

it's always good news when Matt puts up a video on youtube

[@dreamrealitysyndrome]

I saw a comment recommending your videos, and it's interesting that you'll release a waste spark system video, that's exactly what I'm working on. 4runner with misfire at 1 and 2. This is the first waste spark I've seen. An interesting system for sure. I'll definitely be watching more of your videos, I like how you break down the thought process in diagnosing the issues

[@paulpaquette1961]

Great Diag Matt! Gotta love the scope. Awesome troubleshooting strategies and explanations!

[@HGreen-le4nc]

thanks for a great vid and walking us down the diagnostic lane of success

[@aor3200]

Great work again! No necessary parts bought or replaced, but real ace diagnostic.

[@kman-mi7su]

Third guy to comment! Keep up the good work with the videos! And thanks for the insights on my project, a 2000 Dodge Ram 1500 with no injector pulse that you commented on a couple of months ago. Still not done as this time of year my work hours average 60 to 70 hours a week. The truck is on the back burner for now. But again a huge thank you!!

[@diggLincoln]

New favorite channel! Recently changed from ag and construction equipment work to automotive.. soaking up knowledge and loving it

[@fisqual]

Had same exact issue on my friends 02 impreza. Even reported the misfire on the incorrect cylinder. Thanks Subaru. 🙃

[@ignacioromero5014]

I think it flagged over spark on #3, that excess was missing on #4, an inbalance, stating the obvious I'm sure

[@Viper81766]

Great video and good to see you again brother . I think I have been thrown hundreds of loops by vehicles in my many years . You always use a good diagnostic process . Awesome work .

[@SchrodingersBox]

Thanks man. Yeah the loop here was not seeing this specific type of fault before. Turns out the misfire counter was correct after all and that an excessive spark is sometimes actually worse than a weak one!

[@keepinupjonesy3681]

Just saw this... I love your "Test don't guess" philosophy. As a retired professional wrench bender, we have a couple of differences. 1) Time is money & 2) experience breeds patterns. Like, Subaru's have a coil issue, so I, as a professional would have zoomed in on a coil test, all man made things have inherent weaknesses. But, that's not what you teach a DIY. So, Good job! And yes, in a waste spark coil system in which a coil is shared by two cylinders, both cylinders will be affected. Note: each coil is shared (4 stroke) with it's opposite cylinder in the firing order. Taking the firing order, dividing it in 1/2 and stacking it will always give you the companion cylinders, just in case someone else has been there first. Trick for difficult diagnosis. If you find that you have exhausted all your avenues of testing and you can't determine which of the last two possibilities is correct, (and this will happen). Call your dealer or parts supplier and find out which part they stock. Not scientific in the purest sense, but it can reinforce your own diagnosis. They don't stock parts that they don't sell. I love your channel.

[@garrettyoung6367]

One plug fires positive and other negative. This is why you had to invert the firing line to see. Cylinder 3 and 4 fire at the "same time" and are in a series circuit on the secondary side of the coil. Energy leaves one side of the coil and returns on the other side. Windex works better than the test light for finding leaking plug wires as long as not in area of wire which is inside of the head. I have watched a few of your videos, but you really need to change wires also as the coil has a carbon tracking problem some where. Carbon tracking is caused by high voltage burning the carbon out of the air leaving a semiconductor trail. IF this carbon tracking happens to be around the tower it would have transfered material onto your plug wire. Then the plug wire would transfer material back to your new coil causing repeat failure after time until both are changed at the same time. Also worn plugs are going to stress your secondary insulation, and or any fuel delivery, vacuum leaks, valve sealing issuses etc

[@atrayyu3016]

Good info, He did change the wires and plugs. But for the science of the diagnosis, he only changed the coil to validate the diagnosis, later changing the plugs and wires for good health and preventive maintenance.

[@billyyoder8171]

Thank you Matt. Good job. Have a blessed and safe week.

[@SchrodingersBox]

Good to see you again Billy!

[@mharradine57]

we had a Subaru towed in from another shop who couldn't figure out a problem. It was a bad wire but it was weird that it had a dead miss at times and no code at all for the bad cylinder. Eventually a code set but it took nearly catalyst damaging time to do it. I was shocked that it didn't have new plugs and wires on it and to my fault I went straight to compression, assuming they already checked spark! Lesson learned...

[@kkampy4052]

I had a 1993 Town and Country that had an ignition block and wires. It would miss sometimes, die sometimes and run really well sometimes. I found the problem one day when I had my inductive timing light on a cylinder. As I moved farther from the coil, the light would flash less and less. Turned out my plug wires were rotted out at the plug. Replaced the wires and it ran better than it had in years. The wires looked great on the outside.

[@JimmyBagOfDonuts]

Right on, Matt. You're beginning to show some "technician's thinking" (swap first, take an easier path first, etc). It always comes down to: verify symptom, collect data, follow the evidence to get to the 3-C's (Complaint, Cause, Correction). Good jub!

[@SchrodingersBox]

Thanks James! Do keep in mind that often the diagnostic procedure i use in the videos is vastly different than what i might do when not filming (though the thought process is always the same). when filming i often take longer approaches because of the tutorial aspect or just to show a new tool or a concept or principle. If I wasn’t filming this I would probably have done this diagnosis the same way as on film though with the exception that I would have researched this was a waste-spark design first and thus would have pinpointed the coil much faster.

[@Sandbag1300]

Learning about scopes, how they work, what they can do is great. That way, when I cannot diagnose it myself I know what a scope can do when I take the car to a mechanic. Excellent chance I will be able to ask the mechanic good questions and get good results.

[@spelunkerd]

Ha ha ha, that's so funny. You're using a tether to avoid losing your wireless device, great idea!

[@SchrodingersBox]

Yeah I sent it away with the last person I did a diagnostic for hahaha. Luckily I knew them and they returned it!

[@danielbaladjam3393]

@@SchrodingersBox Gday mate i have an issue that has absolutely stumped me maybe your diagnostic mind can give me an idea... 2008 v6 hilux 1grfe trd (supercharged). Developed a rough idle which got progressively worse until i decided to try sort it out. Smells rich at idle and very rough almost a missfire (intermittent). Long term Fuel trims at idle and up to 1500rpm with no load are reaching -20%. Under load or over 2000rpm trims come down towards zero and no issue with power. You name it i have checked/replaced it. Spark plugs, coils, injectors, fuel pressure and flow, air leaks, compression, cylinder leakage, valve timing all triple checked. The only thing slightly off is vacuum which is around 16mmhg which is a little low. Cheers

[@curtisroberts9137]

Great video and very thorough. Much more so than the majority of "professionals" I have worked with. Very smart diagnostics and fix verifications.

[@andrewk778]

Always enjoy your videos. Thank you for sharing. Welcome back.

[@SchrodingersBox]

Good to see you again ANdrew!

[@davidostring803]

Thank you for posting your videos. I learn a lot from them.

[@kingbolen_official]

Agree

[@mansouralblooshi3004]

Thanks for sharing my friend. IMO scope will always help in putting you on the correct direction.

[@loubakker5000]

I admire you the way you handle high voltage operations. I'd never dare touching plug wires while engine is running.

[@ajjmunoz]

He's back!!!!! Finally!

[@tamyboy1]

Good to see you back!

[@riblets1968]

I noticed that you poked the test light probe into the spark plug tube when replacing the boots during diagnosis. What is the reason or theory behind that particular action? Does it perhaps help keep the coil from overheating by letting that electrical energy dissipate where it otherwise would have manifested itself as heat in the coil? Thank you for this excellent diagnostic case study!

[@SchrodingersBox]

No its because I am trying to not get shocked!

[@slayn2]

Think you might have solved the issue I'm having with my 04 Forester. Been driving me crazy trying to diagnose a misfire. Already changed plugs and wires. They were probably about due anyway but didn't solve the problem. Was going to check the fuel injectors next but now I'll test the sparks as you did and if inconsistent change the coil. Thanks.

[@slayn2]

I did verify all 4 wires were sparking already but didn't check for inconsistencies.

[@slayn2]

It was indeed a bad coil pack. Thanks again sir awesome informative video.

[@donnierobertson3088]

Nice job again like always A+

[@mexskal]

The cruise control is disabled since emissions are related with the code or any time the check engine light is on

[@DENicholsAutoBravado]

I've never seen those two correlate before but I've done little more on a Subaru then replace a wheel bearing so...

[@mexskal]

@@DENicholsAutoBravado I used to work for Subaru and they use the same strategy gm uses with the abs when the cel is on. We used to get trained on that, forgot the reason why the cruise control was disabled thoe.

[@TheDisgruntledMechanic]

That was an interesting case.

[@aninullahfaizy2564]

Once again one of the best video Thanks.

[@colincoady9386]

Can find the link you mentioned at the end of the video. have I missed it ?

[@atrayyu3016]

Excellent video.Always love your content. Quick question for you: Seeing as how spark between 3 and 4 were so compromised by the coil, do you think the length of the wires could have affected or even aided to indicate the malfunctioning coil? IE, #4 being longer with more resistance? I Could easily just over or under thinking it.

[@SchrodingersBox]

Good thinking - the extra resistance from the wire length variation causing strain on one coil output. However the additional resistance is negligible. More likely it is carbon tracking that resulted from some other issue with the secondary (worn plug or wire) that ultimately injured the coil, but not wire length itself. This is the reason you should always change plugs and wires on a bad coil- odds are they were the cause of the coil failure. But not wire length alone.

[@mei8752]

Thank you for your help and support.

[@kingbolen_official]

Hey Bro,nice misfire diagnosis content.Thank you!

[@IntradeMotors]

i had a torque converter incosistent speed code on a missfire , and the cruise control could be affected by something like that, if it was a automatic transmission

[@housecallmobilemechanic6107]

Two thumbs up on another great video Matt

[@bbkmm1]

Eric O stated check engine light disables cruise control on Subaru's. So maybe the cruise control light flashing means it is disabled?

[@SchrodingersBox]

Yes apparently any CEL causes disabling of the Cruise Control on Subaru. I was unaware of this.

[@Charles_Mulberry_7977]

Awesome diagnostic skills! I learned alot! Thanks.

[@labradormcgraw]

You deserve a medal just for working on a four-wheeled grow-house; I can't bear the smell of that s@#t. Great video for learning the basics of a scope though. This session probably prompts a lot of traffic to move to the 'Ignition Systems' series on the pay channel... and the learning continues.

[@johnnyzhu6729]

I like ur scientific way of testing

[@SchrodingersBox]

Thanks. There is no other way to test actually- otherwise it’s just guessing not testing !!!

[@kinglangren]

I was screaming at the top of my lungs “it’s the coil, it’s the coil “.. and then the guy behind me in the movie theater said “shut the hell up you idiot!”

[@kinglangren]

Just Kidding

[@kinglangren]

Thanks for all you do I have learned quite alot

[@faroukkatumba2011]

Hi there, I have VW Golf MK4 1.6 Petrol 16V 2003, for a while it's used to Come up with Emission workshop light as soon as I start the car or while am driving and I immediately know it was to do with my exhaust system because it used to make noise at idle or driving. However I ignored the issue and at the same time I had a slip clutch system. Where the car couldn't pick up speed at the gas pedal. So I replaced the clutch kit. Immediately I also replaced the timing belt kit. Nothing much changed still there was a loss of power. Then one day I was reversing into a driveway a loud blust came from underneath the car, checking on it, the exhaust system between the CAT and the rear silencer was split open. Making loud noise from underneath the exhaust manifold then I received code P0106 and 17550. Could it be the exhaust manifold with the oxygen sensor bank1. I got a new exhaust system from the front-pipe to the rear. Still am getting noise from underneath. Another issue is still low power, and I hear hissing noise from the throttle body whenever I step on the gas pedal. Therefore I suspect an air leak around the intake system. I need some guidance please.

[@SchrodingersBox]

Do you have any data?

[@faroukkatumba2011]

@@SchrodingersBox I have not been able to get live data with my scan tool however with that I will be possibly able to tell you that am also experiencing a too rich fuel condition as I ref to your fuel trim videos. Because it taking fuel excessively and I believe it's due to the hissing noise around the throttle body possible the throttle body gaskets. However am due to do a vacuum leak with my home made smoke machine before I jump to the conclusion of taking off the intake system.

[@SchrodingersBox]

Sorry but all this is is listing symptoms. I have to have data in order to make a conclusion

[@johnturner8829]

Hey man, great video, Thank You. A couple things I felt you could have mentioned to a DIYer who is interested in learning and/ or is new to this is that you could not do the spark test with an LED test light. Also, there are cheaper alternatives to scopes that most people may be able to afford or save up for like the single channel U-SCOPE or the two channel Pico Scope. Either would be better fitted to people on a budget.

[@SchrodingersBox]

Ah yeah I should have mentioned the incandescent only. Good point.

[@weldingjunkie]

It’s funny how all different manufacturers have all different strategy’s. Like you I don’t work in many suburu but I do own and use some awesome diag tools like Snap On Zeus, launch Torque, Autel Elite, Picoscope 4424 (4) channel, Autel Maxiscope, Uscope, AES Usctivate and use all of them. Some have holes and gaps that others have and don’t have..A scope is fully needed to diag most of the time.

[@robertocantu792]

Good Mr S. My daughter has a 2010 Subaru Forester non turbo that for some reason runs better on unleaded plus. The car pings on regular unleaded from all gas stations. I suspect the engine is carboned up. Recently the car had the head gaskets replaced by the dealer who performed a messy job, i.e., reused the old plugs, stuff like that. We made them replace them. No cel present.

[@SchrodingersBox]

Yeah I would suspect most likely explanation is carbonized piston heads

[@rrmech11]

Nice to see you. Excellent job. 👍👍

[@SchrodingersBox]

nice to see you again richard!

[@Jake-im2lv]

Bought an 85 Celica with a bad miss and would bog badly under load. No check engine light either. Just followed the service manual and tested all the sensors and compared results, found the tps was out of adjustment but that made no change. Took off the egr valve on a bunch and it was completely clogged. Cleaned it up and reinstalled and it runs great. People who Just use the parts shotgun approach are so frustrating especially when they moan that whatever sensor someone told them to replace fixed an issue for them didn't work for their engine

[@Agent-nw3it]

When you check the spark with scope, you are taking signal just by puting a clamp around the spark plug wire and basically checking induction? If not, please correct me.

[@SchrodingersBox]

Yes that is correct. There are even similar versions where you can do this from an igntion coil as well!

[@donaldclapper4699]

i have a kinda dumb question could the volt regulator share some of this problem

[@SchrodingersBox]

No- not with these symptoms.

[@bigfootemobileauto9734]

And yeah that was interesting I’m glad I watched this. The KV on the one spark what was it number three? was really high and that was because the spark on the opposite side was weak giving the one high spark line on the kilovolt so much higher than the other.? Am I saying that right and making sense? that was an interesting find. Thank you, Doug

[@SchrodingersBox]

yes this is exactly what i suspect happened.

[@MechanicTechnicianRepair]

Hello. Teacher l like that tool you are using lois have it I have a guestion where can get that connection.

[@SchrodingersBox]

It a vantage pro from snap on.

[@MissouriOldTimer]

several models of Subaru's the cruise won't work and the light blinks when the check engine light is on,, I guess they do that so we will get the problem with the check light fixed.

[@SchrodingersBox]

It’s that way because the cruise control can’t confidently be controlled by the PCM if there is an engine problem. If there is low vacuum for example, cruise would not be able to be maintained.

[@byoung9627]

Have you compared AE to autel? I have both. My AE proline is updated till last year. I find autel does way more bidirectionaly. However I haven’t upgraded to the latest AE WiFi.

[@SchrodingersBox]

I have not. The last Autel I used was maybe 4 years ago but refresh was so slow I couldn’t stand it lol!! I understand it has improved since then, as AE has but i haven’t compared side by side.

[@1984juant]

Hey Matt in your website my google browser tells me that "my connection to this site is not secure". Can you check on that? Thank you.

[@SchrodingersBox]

Interesting, mine definitely does not say that. either way its OK because any payment information is done through STRIPE which is as secure as it possibly gets.

[@byoung9627]

Also would a spark plug have an effect on your spark check? I ask because on the waste spark it still has to jump one plug before jumping to the test light. Right?

[@SchrodingersBox]

it would on the scope for sure however the spark gap test doesn’t involve the plugs so whether or not the wasted spark jumps a plug or not you still get spark at the test light

[@byoung9627]

Schrodingers Box I would think it still involves the second plug of the pair. No?

[@SchrodingersBox]

My guess, based on this case study, is that if the second plug has high resistance or is open then you would see the gap jumped to the test light increase. I assume he spark gap it’s like a string- the string should be equal between the 2 spark plugs. If one plug has a high resistance the string is longer on the other plug (like what happened with #3 and 4 in this video). I assume if I left one waste spark wire disconnected with no spark and tested gap at the companion cylinder the full length of that string would allow a massive jump because all the spark energy is at just one side now. Not totally sure on that. I’ll have to learn more about it. But I do know that the spark energy should be equal at all cylinders. I do assume variables on one side of the waste spark will affect the other side though, so i agree with you

[@bartscave]

@@SchrodingersBox My guess is that the high energy available on the #3 wire was due to an open in wire or coil on it's companion cyl. The other wire with less energy is because it is limited by whatever the spark plug gap is on it's companion is. So the second plug of the pair limits KV by bleeding it to ground after it jumps the gap. So a shorted plug would affect both cylinders and likewise an open would increase potential energy. Just a guess, but it makes me wonder about how one cyl affects its mate.I'm going to have to study waste spark a little more, now I'm curious.

[@mattbickford2640]

14:48 wow, first the "WOT" then that wave form? totally plugs and wires! 19:40 yup.. missed that step but totally called it! still, thanks for reinforcing the basics! 35:41 check it out! "mr. plugs and wires totally fixed it!" dang.. ok i would have been burned by this, thanks for the share, and still following through the basics(funny how you follow the basics and you find the root cause of the issue instead of getting trigger happy with the parts cannon like i just did)

[@JD-526]

YOU have an intuitive sense

[@ramzyboualleg3716]

hi man, i have a Subaru forester no engine on, but there's a rough sound knock little bit. My o2sb1s1 run at 2.2 and 2.9 volts and short trim fuel going down (10%) when i rev. do you think my o2 upstream sensor is done? thanks for the answer. by the way my name is Ramzy and i'm from Québec Canada. French canadian

[@SchrodingersBox]

I don;t know- induce a rich and lean variable and see if O2 responds but the fact your fuel trim is only 10% clearly indicates the O2 is accurately reporting a real condition

[@ramzyboualleg3716]

so for you it's ok with the o2 and what if my muffler is bad (rattling on and off), what kind of symptom can have my engine. thank you very much to answer my question

[@Stambo59]

I guess this is where familiarity comes in. Coils have been an issue to those of us that regularly work on Subaru and many other Japanese based vehicles and as you say, mileage is irrelevant. It is quick and easy to try an ignition coil (we have a known good used Subaru one) to confirm whether the problem is or isn't coil based. This is obviously a very non scientific approach but achieves results more than 90% of the time. We also regularly use the moving of parts to another cylinder on non waste spark coil over plug systems to see if the recorded misfire moves. If an American vehicle comes in however, we have to go back to proper diagnostic methods like you did with this vehicle, as we are far less familiar with these. I am sure there must be known issues with certain American vehicles that you can say with reasonable confidence, that is most likely "this part".

[@bigfootemobileauto9734]

I was wondering why you didn’t use two channels on that so you didn’t have to switch back-and-forth. Probably because you just had the one lead and you just decided to go with that hah? Great video Matt keep up the good work and welcome back. Doug

[@SchrodingersBox]

correct- its because i only have one capacitive probe.

[@max.rod111]

Sometimes using the lowtech method what if the sparkplugs are froZen or break off while taking them out???

[@SchrodingersBox]

Yes or even more likely- what if you can't even access the spark plugs without removing the intake which is more and more common! This allows you to see if you even have to go through all that in the first place!

[@laneburgess1643]

Great video. Thanks for sharing.

[@doug2993]

Awesome video, great job!!

[@donnierobertson3088]

Nice job again like always

[@Pablo_Automotive]

Great video again Matt, i like you make diagnostic whit head, regards from Spain my friend

[@SchrodingersBox]

Hey Pablo I was worried! You didn't show up for 4 days this time!!!

[@Pablo_Automotive]

@@SchrodingersBox Sorry Matt do not worry, lately I'm very busy with work and studies, but I had to watch your video, a hug =)

[@mrfrenzy.]

I would say the P0303 was correct since the scope did show incorrect firing on #3. Probably bad insulation in the coil causing the #4 spark jumping over to #3. Still enough voltage to fire #4 but it also causes #3 to fire at the wrong time.

[@SchrodingersBox]

Yes I agree. This is where the scope is the only way you can confirm it- indeed the misfire was on #3 only. I was just misled by seeing what I thought was a healthy spark.

[@Nothingman88]

Yes, thank you for the vid. I feel like I did a little time traveling during that video with the edit. How 'bout a classic no crank, no start?

[@jamesmays6826]

Amazon has a mini scope its 2 channels you do have to get adapters and leads all for around $200. It is called sain smart DSO212

[@SchrodingersBox]

Yes I have seen it before- several versions on mini-scopes actually. I am considering buying one to just keep in my car's toolkit so I have it in the field.

[@carloserazo1286]

How did the spark plug on 3 looked like?

[@SchrodingersBox]

All the plugs looked the same.

[@ghtmedia3460]

I really like your test light! I always (used to) use a screwdriver for this, and maybe got shocked once or twice. I like how the test light can get down a boot better than a screwdriver. What kind of test light is that that you are using? I may buy that same one. From Amazon.com lol

[@SchrodingersBox]

Its just a standard test light I got from harbor freight I wanna say I got two of them for $2.99

[@orubenvaldez]

Excellent diagnosis

[@techmodek]

Dam bro, why you only getting these lil bit of views... Youre way nicer than that. Btw, thanks for using the tools you know i can adford

[@SchrodingersBox]

I appreciate that! Indeed the point is to show how you can do diagnostics with affordable tools.

[@Tedybear315]

For those that do not want to watch the entire video (And why wouldn't you??? It's good stuff). Subaru has the system setup so then when the CEL comes on? It will flash your cruse light and disable it (the cruse control system) We've got an 07 Forester and it triggered a P0420 code (leaky exhaust of all things before the cat conv.. Same thing...Really surprises ya when going down the highway. Basically it's an attention getter

[@SchrodingersBox]

Yes i did research it and you are correct. It is related to misfire.

[@allanflynn8026]

What kind of test light is that? I bought an auto test probe light that looks like yours but it says specifically on the package 6-12 volt applications: “not for ignition systems” WTF!

[@SchrodingersBox]

Its a 6-12V test light that I got from harbor freight for $2.99 that says "not for ignition applications"

[@allanflynn8026]

Schrodingers Box thanks mate, did the globe globe in your tester burn out - i didnt see it light up when you connected it to your leads and just wondering if i need to modify mine prior to using on the leads, for example removing or replacing the globe

[@SchrodingersBox]

No- how would the globe light in the application shown in this video? I am not using it as a load.

[@lainemann1421]

The coil voltage inside the coil itself has a crack and is not allowing the spark to e consistent with the 2 cylinders period

[@OP-ik7qb]

Hey bro great video. Thank you

[@megaman4201]

Hey brother, love the videos! I recently subscribed to your paid site but videos won't play, what can I do? Todd

[@SchrodingersBox]

What browser are you using? i am using chrome and it works fine.

[@RzVids]

How would this process work for coil on plugs? I’m also having a misfire P0300 and P0305.

[@SchrodingersBox]

switch the coil to another cylinder and the plug to another cylinder and see if the misfiring cylinder changes.

[@RzVids]

Schrodingers Box it didn’t change

[@SchrodingersBox]

@@RzVids OK then now you simply have to check your inputs and ground on the driver to verify you have signal and control of the coil. Remember- the coil is pull down design (ground side switched).

[@RzVids]

Schrodingers Box hmm “on the driver”? I’m not sure what/where that is =\

[@SchrodingersBox]

@@RzVids on the coil itself. Just make sure not to bypass the feed directly to ground. I personally use a testlight but a DVOM works better.

[@TheCowgirlNiamh]

Great to see you Matt! Loving the cheeky hair 👍😂 Excellent and sensible diagnosis as always! Xx

[@SchrodingersBox]

Thanks my friend!

[@labradormcgraw]

It's a shame that the knowledge provided in this video is completely upstaged by some pineapple hair at 7:50 LMAO.

[@cody6]

Good job Matt!

[@DependableAutoTruck]

do u use a attenuator in this test

[@SchrodingersBox]

no not on this one. No need for it.

[@DependableAutoTruck]

New to scopes just got my first one about a month ago got a vantage legend taking me a while on safety with it

[@jodyjr00]

Hello this may not interest you but i need help. I have a 99 toyota sienna with 220,000. It starts up abd idles great. Revs up great but soon as you out it into any gear but neutral. It falls on its face hard. I clean idle air control MAF sensir is good TP sensor is good. Please help. The CAT is not clogged. The car qont move starts fine but soon as you put it into gear boom engine stops.??? Anyone have any ideas. Please please

[@SchrodingersBox]

WHat was your data on the TPS that you say it is good. I need that data.

[@jodyjr00]

@@SchrodingersBox Schrodingers Box hello thank you for responding. I connected a volt meter on resistance to the Throttle position sensor and im getting 3.828 closed and 1.160 when fully open ??? I check the wire giing to the sensor and i have power and ground. 5.5 volts in power wire.

[@jodyjr00]

@@SchrodingersBox 0.580 ohms closed and 3.214 fully open no OL inbetween

[@jodyjr00]

Its like once it engages in gear bam its like sticking a stick in a bicycle wheel and stop. Torque convertor?

[@SchrodingersBox]

Well you can rule out the TPS. What about the MAF data?

[@ramongonzales1631]

Can you post model number of scan tool your using?

[@SchrodingersBox]

It’s a autoenginuity Pro-VCI

[@faroukkatumba2011]

He's the greatest alive in knowing car diagnostics

[@SchrodingersBox]

Not sure about that but I am definitely better than anyone dead.

[@mtrltoolman]

Good job man as always.

[@SchrodingersBox]

Good to see you too!

[@InsideOfMyOwnMind]

Nice one. Now, you're likely to get some who will say that marginal plug/wire could cause the coil to fail. I get it. Both ways. Now just wondering if you did change them out based on that or on some other philosophy? Nice to see a new video from you.

[@SchrodingersBox]

Yes exactly. The reason I would always change plugs and wires with a coil is in the case that the coil failed due to resistance in one of those parts. Don’t want the new coil to fail for same reason. In this car because I switched the wires around I know the wires are fine but the plugs were never tested.

[@rickcoleman8903]

Engine computer disables cruise with ecm faults on subarus.

[@satamanschmidt3428]

This is true even for small evap leaks. Eric O. had this with a Subaru.

[@texas77563]

everytime i watch your videos im always waiting for the big cat at the beginning. raaaaaaar. love that part. sometimes it doesnt do it and i wonder if its a mandela effect or something

[@SchrodingersBox]

Hahahaha- I didn't create that opening until a few years ago- prior to that I had different opening screens

[@neverstoplearning382]

Just great and thanks sir.

[@donaldclapper4699]

i hope i can ask question while trying to learn

[@SchrodingersBox]

Of course!