How to find a misfire without a scanner 2

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[arturonunezdorantes]

Thank you very much. It teaches us a lot about the electricity in cars. From Mexico, please get my gratitude and personal recognition for your knowledge.

[jeffclark]

I have had my forerunner at a certified Toyota mechanic shop.
for at least four years similar situation and no one can tell me exactly what’s going on.

Your video has been great and explaining and diagnosing the misfire.
I now can’t wait to try it out thank you so much.

[wseeback]

EXCELLENT video. Not only do you show it being checked, but you actually TEACH us how to check for ourselves. I wish all youtube car videos were like this. Thank you for making it.

[Idontevenknowwhatthisisfor]

Thank You SO MUCH! I was able to narrow it down to a bad spark plug in cylinder 3. I replaced all 4 spark plugs for 20$ and runs great! Saved my mom money by not bringing it to a shop. THANKS AGAIN!

[mikemcelveen]

There is a leak in the middle cylinder coil boot. High kv under load induces the spark to go to ground via the spark plug port. No load kv at idle will allow current to flow through the spark plug. I would love to work with guys like this. Great video I'm sure this will help a lot of newbies.

[Erklzanderz]

Great video! This reminds me of my Grandpa because it truly reflects how your generations had the ability to troubleshoot properly through creativity!

[Sam-dele]

Really nice video  I think you showed us that we really may not even have to use the paper clip trick at all since by pulling out each core individually gave us indication of spark and yet did not indicate which cylinder was mis-firing until you raised the core itself.  Simple enough for me. Thank you much,   Keep up the great work!

[fixr]

You could swap the coil pack to see if the trouble followed to another cylinder, and if it does... coil pack, if it doesn't... spark plug.  Great video illustrating basic/advanced troubleshooting skills!  I think I'll subscribe!

[tomreyes]

You gave me a good lead on how to fix my issue. I started per your video but also placed a timing light at the end of each wire by the plug and found on wire was bad. Replaced wire and runs as smooth as new. Thanks for posting.

[skillz]

This guy reminds me of an engineer I trained with at Acura, B4 I went on to BMWs. he has a very detailed way of explaining things to beginners

[ownsnine]

EXCELLENT instructive procedure for spark wire coil and plug diagnosis. the ONLY flaw in the whole video is your statement that spark is coming UP from the bottom of the plug. It is not, it is coming DOWN the wire TO the plug FROM the coil and choosing the apparent path of LEAST resistance and going down the side of the plug in the carbon filled crack to get to ground where the plug screws in to the head. So it does not come UP FROM the ground point it comes DOWN from the coil Voltage travels + to - not the other way around.... But needless to say that changes nothing if someone does not know that it will not hinder the purpose of this video in any way anyway. Absolutely fantastic video other than that pick at you point well done. I am a Mobile Tech been doing it since 1994 i actually helped a customer avoid spending money with me and CURE his 1997 3.4 toyota misfire with THIS video as his aid (send him the address) so again, great job thanks much.

[ThePettyLibrarian]

Wow... Outstanding. We need more people like you on YouTube. Thank you for sharing your knowledge

[spelunkerd]

When you shorted the ground wire the flame was the same size on each. As you pointed out, if a wire is bad the flame would be bigger, because of more resistance in the natural pathway through both plugs on that circuit. If either plug was bad, I would expect a bigger flame as well, for the same reason. So, those of you who say it's a bad plug are ignoring that part of the evidence. Of course, inspect the plugs, but I think it's something else.

[coycarlson]

Great demonstration of logical troubleshooting 👍 . I believe the cause of the misfire to be one of the two plugs fed from the center coil which was not contributing under load. It is possible that maybe the center coil is breaking down under load - however when you lifted the center coil out of the spark plug well - it appeared to have a good spark jumping / arcing from the spark plug boot - so I am thinking that maybe the center coil is still good. 👍🧐✌️✌️

[nathanielreid]

I would swap the coil pack in the middle with any one on the out side, if the misfire go to the outer cylinders then I could say it is the coil pack that is defective. However, if it remains in the middle cylinder then I would conclude that the spark plug is defective.

[davidrowland]

He described that better than I've ever heard anybody on YouTube

[bearsrodshop]

Picked up an 06 CTS few months back. After engine poped on, found a P305. Been driving, but now time to correct, and this video really helped. Bear

[likits]

Very nice and professional explanation. I will try that on my Z3 and update after my diagnosis.

[livinlifefl]

Man. My hemi is misfire crazy with zero codes. New motor. New plugs. Old coils. Runs great. Only misfires under load around 3k rpms. This makes me think i have a bad coil. Gonna test them like this. Thank you.

[TheDadofsix]

Wow great video. The rear bank of cylinders on my Ford Edge prevent access to the rear plug’s coils but it’s good information for the front three!