P0304 Hyundai Sonata cylinder 4 misfire

P0304 Hyundai Sonata cylinder 4 misfire - These troubleshooting methods will work on many makes/models of cars/suvs. Learning this technique will save valuable time in diagnosing the actual cause of a misfire engine code (P030X). Some basic tools are needed but nothing super expensive or complicated to fix this. Enjoy and thanks for the support!
Amazon Associates Earning Affiliate links to tools and parts used for this project:
Innova Code Scanner - amzn.to/3ECeLmk
Socket Set (10mm socket used) with extension - amzn.to/3ECsCch
Spark Plug Socket - amzn.to/44UBIvM
Sea Foam (3-pack treat all your vehicles while you are at it) - amzn.to/3sKQW9c
Wix Air Filter - Use this link then filter for your make/model - amzn.to/3sT1a7L
Coil Pack (not needed this time) Use this link then filter for your make/model - amzn.to/469C2I5
NGK Spark Plugs - Use this link then filter for your make/model - amzn.to/463FSmF
Anti Seize Compound - amzn.to/3rdUNLO
AIM Penetrating Lube - amzn.to/3U3jPW0
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Chapters:
00:00 - Intro and Description of issue
00:41 - Scan for codes
02:03 - Pulling Coil Packs and Spark Plugs
03:29 - Reading Spark Plugs to diagnose
04:05 - Coil Pack troubleshooting technique
04:44 - Buying parts to repair
05:06 - Using a bore scope to see inside cylinders
06:28 - Installing new spark plugs
08:42 - Replacing Air Filter/cleaner
09:59 - Adding Sea Foam Fuel Treatment
11:03 - First Engine Start After Repairing
12:40 - Fixed and Outro

[@SonicOrbStudios]

Oil burnt on those plugs cause the buildup

[@troysgarage]

Pretty sure that was the issue.

[@340rps]

I would go with a fuel injector cleaner, much better

[@troysgarage]

If you have it on hand use that. I didn’t so used what I had. Worked fine.