2003 hyundai accent P0304 Cylinder 4 misfire - Hyundai Forum: Hyundai Performance Forum
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post #1 of 2 Old 06-30-2019, 11:16 AM Thread Starter
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2003 hyundai accent P0304 Cylinder 4 misfire

Hi all!

I was wondering if anyone has experienced this issue or has any suggestions?
Been working on my 2003 hyundai accent (221k miles) and have tried several things to clear up code P0304 Cylinder 4 misfire.
- Spark plugs
- Plug wires
- Coils
- Fuel injectors
- compression test shows 155


The car runs great. No stalling, no loss of power. Turns on without any issues.
After replacing the fuel injectors and clearing the codes, the code still shows as pending on the scanner.
The check engine light now only flashes when the car is at a stop. When driving, it disappears.

Would anyone have any suggestions?
Thanks in advance!

Last edited by jerryjmarshall; 06-30-2019 at 02:26 PM. Reason: updated info
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post #2 of 2 Old 09-15-2019, 09:55 PM
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I'm having a hard time to believe the engine runs that great. There must be a misfire. Does it run rough? Is the engine noisy? A collapsed lifter could do that.
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