possible to test coil pack?

Googled a little and couldnt find squat, using an ohm meter, how does one go about testing a coil pack? Dude at autozone didnt have a tacoma in their book for some reason so he unfortunately was unable to help much more, im thinkn just replace it and hope the CEL quits. Maybe a thing of injector cleaner.

 

If you getting a misfire, switch the coil with a working one. If the misfire moves with the coil, you know its bad.

 

Thankyou, concerning 1 and 2, i took it into autozone, pulled it in parking lot, (got engine was hot on this 110 degree day), and the kid told me how to test. Oreily seems to be uselss as knowing anything, and napa is napa. They had tested it with a ohm meter i happened to have in truck.

I could play mismatch, BUT i dont have a reader, and it doesnt instantly throw the light, i have a job in the morning 30 miles, so we will see.

4, im good. haha


long story short, i got a new one, duralast gold, no not the oem denso but oh well. truck doesnt jerk while accel and hopefully my mpg goes way up.

 

So its just running like shit ?? Not throwing codes ?? If it is (check engine light)go to AAMCO, they'll put it on a reader for free & tell you where to start looking, as far as testing with a meter not really sure, but if theres a noticable amount of resistance, could be bad coil pack, but I don't know what acceptable limits are spec'd out to be..

 

I had the same problem and it turned out to be a crack in the boot, make sure all your plug boots are not cracked and the little coil inside that clips on to the plug is connected to the coil wire. I just used electrical tape to fix it.
Just a thought.

 

Was throwing CEL, bank 1 lean and cyl 3 misfire. cyl3 has the coilpack directly on it, and the lean COULD be because of the misfire bad coil.

boots were fine, i changed plugs few weeks ago and they proved to be not the culprit and inspected wires while i was there.

 

I have had a "Misfire" with a CEL for about 5 years now. Codes are for a 300 (Random Cylinder Misfire) and a 301 (Cylinder 1 misfire). I replaced the coil pack first, but the CEL came back on 3 weeks later. Replaced plugs and wires next, and CEL was back on 2 or 3 weeks later. Ran fuel injector cleaner in it as well.

Funny thing is I never feel a misfire and the truck runs great. So here I am 5 years later with the same check engine light. Took it to a mechanic finally and they hooked it up to a scope and said it is NOT misfiring and compression is good. They also cleaned the Mass Airflow Sensor and replaced the air/fuel ratio sensor. CEL was back on in 2 days with the same misfire codes.

Gremlins in my engine I tell ya...