P0304 Cylinder Misfire | Troubleshoot Engine Misfire Problem

[@michaelforsythe6]

Nice. Even new parts can fail, great troubleshooting process

[@404notfound.....]

Excellent video, just a pro tip though you don't have to do an auto scan, you can do a manual scan and just bring it over to diagnostics for engine. I have the same autel but it's the mp 808. Also don't forget a little bit of dialectic grease to go on the end of the boot before you reinstall back to the spark plug.

[@dial2fast]

Thanks for the tips! Especially the dielectric grease.

[@pebbleslove9731]

Is there a more serious problem if this happens more than once afrer replacing 4 cylinder coil within 6 months time???

[@jcravatt1]

mine was an newer ignition coil- luckily had a few original coils lying around

[@papertowel3472]

Smart troubleshooting, many many thanks.

[@frankdillon6127]

there many complaints where people purchase fake NGK iridium plugs off the internet. where did you get the plugs?

[@Dylan-kw4ol]

Hope you had a Merry Christmas and a Happy New Year

[@dial2fast]

Happy new year

[@buddyboy4x44]

When you first checked after switching the coils, surely the fault code from before would have showed until you erased it then scanned again, as you did with the spark plug later?

[@robbieaussievic]

..... Good thinking Mate, correct, it should have been cleared first. If it was the coil and not cleared two error codes (3 & 4) would have been displayed. Before commencing I would have wiggled connectors around while running to see if anything audibly altered. I think the new plugs were iridium ? I think the gaps are different from standard plugs ? That wouldn't have manifested in a instant fail though. So I concur, internal plug failure.

[@buddyboy4x44]

@@robbieaussievic That clarifies it. The test, then, is if two codes appear it is the coil. In that it was only (the original) one it rules out the number 4 coil.

[@dial2fast]

Thanks for all the good points on this issue. Really appreciate it!

[@i-ammoney8397]

I have this code P0304 I replace the coil oack and the spark plug. Still miss firing. Maybe I got a faulty coil oack or spark plug. This is driving me nuts!!

[@mariva55]

Did u ever get it fixed?

[@chrisgreene9963]

​@@mariva55I'm having the same problem. Did you find the problem?

[@amandam7042]

Awesome video! I ended up needing a new spark plug and the error is gone! whoohoo! Thanks for the help :)

[@Jean-PaulLavoie]

Bravo

[@MrWoodstar1]

How about the Wire Harness?

[@JR-yg1jv]

I have a question sir i’m having the same issue with that code p0304 I replace all spark plugs and I replaced all ignition coils and the light is still on with that same code what else can it be? Thank u

[@shbt8875]

Did you figure out what was wrong because I did the same fixes you did and the light was cleaned but came back on the next day

[@JR-yg1jv]

@@shbt8875 yea I check the fuel injectors and moved them around and it went away

[@JR-yg1jv]

@@shbt8875 maybe try that bro

[@shbt8875]

@@JR-yg1jv alright I appreciate that reply will do that next

[@mummaistvan7320]

I replaced spark plugs, ignition coils, fuel injectors, after moving around. Still P0304? EGR Valve, MAF sensor, no vacuum leaks, any info what I should check next? O2 sensors all good, Cat good, fuel pump good? I've spent $1000 having diagnosed. Don't have a clue what direction to try next. Thanks

[@alfredogallegos8032]

thank you

[@nazgeebowe2268]

Torque setting to install spark plug on the Elantra GT…???

[@wildwolf8983]

What’s the scan tool that are you using?

[@dial2fast]

Autel MaxiCOM MK808BT amzn.to/3toyrVj

[@aymenmohamed1134]

👍👍👍

[@MilwaukeeMarco]

First off that's a Hyundai it's going to run rough anyway😂

[@TheAbJGarage]

wonderful!

[@clench2642]

Sir what specific tool do you use to take out spark plug?

[@Bella-nv2yp]

Is it under warranty?

[@dial2fast]

Not under warranty.

[@ivansebugere7186]

My question..is...do i need to replace all the 4 spark plugs...or i just need to replace the one misfiring...

[@dial2fast]

If the spark plugs are due for replacing, then go ahead and replace them all. Otherwise just replace the one bad one.

[@محمدكاشفمحمودآٹوکارالیکٹریش]

Good job thanks you 👍