How to diagnose a misfire quick and easy!!!

Today we're working on this Toyota Matrix 1.8 Liter engine with a misfire code in cylinder 2. im gonna show you a quick and dirty way to check if you have a bad spark plug or an ignition coil, and then we'll proceed to fixing the car. Enjoy!!

[themechanicla]

You make automotive look so simple, and that's because it is. Thanks for posting your videos.

[joeberg]

kid car had a misfire / engine vibration problem especially at low speed / idle conditions. In his case the check engine light came on and off once a second. P0300 & P0304. We removed the solenoid pack for cylinder 4 spark plug. We did a simple ohm resistance test on the primary (.5 ohms and secondary 7, 100 ohms + -15%) ignition coil test. Sure enough the high voltage side of the coil was a open circuit. We replace the coil and started the car. Immediately the engine vibration was gone and all was happy. Our biggest issue in this effort was releasing and removing the ignition coil electrical connector. That took 25 minutes to figure out where and how to squeeze and release clip mechanism worked.

[Septagrim]

i already knew this but i feel like i still left learning something. i think its how simple you make everything. love it!

[Volusiaev]

I'd rather swap parts to diagnose rather than fire the parts cannon.


Good job man.

[cousinjohncarstuff]

With my Daughters car, oil on the bottom of the coil as you had. Replaced only the boot on the coil, and voila! it was fixed for far less than the cost of an entire coil.

[wyattoneable]

Nice troubleshooting and fix. Those coils were easy to get to. Nice job.

[Jeff-rkhq]

Clear, concise and to the point I truly appreciate the video man keep up the good work🙌🏼💪 thanks again hector

[charlesshankle]

I bought a Matco little God pen as I call it for $26. It has saved me some time and allowed me to cut my diag time on a bad coil to two minutes or less

[patswanepoel]

Brilliant your the best yet And you are very articulate and provide info that any one can understand your my new hero

[YUPE]

I like your style homie.
Right to the point and super detailed.
God bless you.
Homie here in guatemala city learning from the best.

[sugarfree]

Easy Peasy but then again you make everything look easy dude.

[HN-kkvy]

That dude whistling all day would drive me

[marke.]

My 2006 Toyota Matrix XR with 117k miles does random misfire on cold start every morning. I wonder as to what problem is. Great video Hector 10/10.

[rm]

Great video
Appreciate u explaining your analysis

[ramvanbobby]

Dam homito your a badass little mechanico huh 😀👊👍

[michaelburtin]

Great video my car does the same thing quick question is there a way that I can fix just one spark plug tube seal that’s leaking oil in it instead of replacing the whole thing and I have a aftermarket ignition coil do I have to replace that and the spark plug as well

[aimeeesqueda]

Wow, you made that look very simple. I wonder what the total cost for this job was including the new gasket?

I have a 2004 with a misfire in cylinder one. I know there’s a leak in the gasket so I have a strong feeling this might be my issue as well

[thomasbrustad]

You said that #2 coil smelled of oil?! If so, should have replaced the valve cover gaskets also. I have found that the gasket around the spark plug/coil area of the valve cover will leak and cause a miss fire also. In the past I have found out that when people use after market electrical parts like coils and fuel pumps they have a tendency to fail a lot sooner than OEM. Good video.

[jimmyfavereau]

I’d like to see the results ‘after ‘ the coil was replaced. 👍

[AlwaysDiagnoseVehicleFirst]

I have a 2003 DODGE CARAVAN SE V6 3.3L

The minivan is giving me a P0300 code.

I turned on the engine and left it idling.

Connected a test light to a ground and connected a vacuum gauge to a vacuum port on the upper intake manifold.

I did a cylinder drop test using the test light while removing one wire at a time from the coil pack and observing the vacuum gauge needle for movement.

As i was removing one wire at a time from the coil pack using the test light the vacuum gauge needle was not moving so i can know which exact cylinder is misfiring.

Do you happen to know why the vacuum gauge needle was not moving?