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P0304 Diagnostic Trouble Code Discussion for August 2021

Cylinder 4 Misfire Detected

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Trouble Ticket Help Requests for DTC P0304
Help Request Posted
2015 GMC Sierra 1500 SLE 5.3L Misfire VIN: EGTU2VEC6F
P0304: Misfire 4 cyl. Ok please bare with me. Owner gave me this truck and told me we are doing a lifter job.misfiring and tapping. 5.3 gm -standard stuff he thought. I take it apart and notice #4 cylinder intake pushrod was bent and after head removal , i noticed the lifter wa...
August 10, 2021
2012 Hyundai Elantra GLS 1.8L Poor Idle Quality, Surge, Misfire VIN: KMHDH4AE4C
P0304: . This Elantra will misfire at idle in gear mostly when the ac is on. I can leave running at idle with ac and it will eventually throw misfire codes. I checked the plugs and coils on cylinder 1 and 4 and they look ok. I cant get it to misfire off idle. I che...
August 27, 2021