How to diagnose a misfire quick and easy!!! 

Thanks.....my 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.

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

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

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

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

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

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

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

Awesome brother thank you! Keep killing it!

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

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.

Dam homito your a badass little mechanico huh 😀👊👍

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

Great video Appreciate u explaining your analysis

That dude whistling all day would drive me insaneeeeee!

Thanks a lot, you helped me a lot!

Thanks you did good simple and direct

I have a p0300 code on a Nissan 350z 04 what could it be? I was thinking it could possible be the catalyst converter or the coils packs not the plugs cause I recently replaced them.

Good job homie!

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

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.

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.

What about if the misfire doesn't follow the coil pack coz I hv Mercedes v6 c240 it hv misfire on cylinder 1,2and 3 when I swap the coil packs the misfire still stays on cylinder 1,2and3

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

Homie Hector, you seem to be a real pro with the Verus. On a 2003 Ford Explorer Sport 4.0L engine in Mode #6 Test $53 I get cylinder misfires on Cylinder 1 (321) Cylinder s 2 and 3 (0) Cylinder 4 (108) Cylinder 5 (653) Cylinder 6 (217). What are these numbers telling me? Bank 2 problems

My scanner read ignition coil code so I went ahead and changed the ignition coil, spark plug cables and spark plugs but I had to clean the oil that was on the spark plug well. All seemed good but later I got a code p4020 catalitic converter bank 1. The car was parked but this morning I decided to start it and got a code misfire on all 4 cylinders. I went ahead and changed the coils back to the old coils and then I got only a misfire for cylinder 4. This is really frustrating. Any ideas as to why it is still showing misfires?

Question I've got parts an its still reading mis fire on 2 already changed plugs an coil its still mis firing what u think Is the issue

Could it stop it from starting

My 2000 Avalon showed p030 code and the engine light is flashing. Did change my sparks and coils today and the mechanic reset the light , but after I drove off the light came back on. Not sure what to do

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?

Hektor, I have a 09 Ford Edge engine light on and putting etc like u mentioned in vid, diagnostic @ autozone says replace fuel injector, cylinder 2 misfire.. so try the coil pack thing? Or the spark plug suggestion?

What happens if you get change the coils and plugs. But your car is still showing check engine and saying misfire all over agian. Than what?

Hey Homie! Got a 2006 Merc S430 with a misfire on cylinder 3 at right around 4k rpms. I changed plugs, wires, maf, air filter, fuel filter, coil packs and checked injectors for a clean spray pattern and im still misfiring 😖 Que recomendas? Compression check? I switched coils and plugs around to make sure i didn't have a defective part as well. Just always cylinder 3 ☠

Timing chain that's the shit right there

What about P0102?

Eres piesa pa la mecanica compa

What coils do u recommend? For toyotas

Thanks

I bought a Bosh screwdriver just cause u have one

But what if u changed it an the wires an the spark plug an I still have misfire cylinder 1

Hektor yo tengo un misfire en my wife’s element 06

My misfire fixed by cleaning fuel injectors, it wasn’t that easy but i did it myself

Like!

That Spanish song lol

Please can u fix my car

Yeah! Let’s look at some live data with that high speed scanner

If you got shit like this 😂

Denso only

OE part is always the best

There is no way to feel what causes a misfire - feeling the misfire is easy plus changing two factors at a time is a horrible diagnostic method

That anti sieze on the plugs pisses me. Chome threaded plugs ( all newer plugs ) DO NOT NEED ANTI SEIZE.

Damn..... you wasted a ton of time for working book time. No wonder your job less F’ing parts changer. You didn’t prove your cause or justify your recommendations.