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P0304 Diagnostic Trouble Code Discussion for April 2021

Cylinder 4 Misfire Detected


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Trouble Ticket Help Requests for DTC P0304
Help Request Posted
2015 Volkswagen Jetta GLI SE 2.0L Misfire VIN: 3VW4T7AJ2F
P0304: miss4. hello iatn i got a head scratcher for ya. 2015 jetta 2.0t cpp with miss fires at idle high misfire counter on 3 and 4. things ive done, walnut shelled valves very dirty(carbon), replaced timing chain due to tensioner being out seven notches, replaced oil s...
April 06, 2021
2015 Volkswagen Jetta GLI SE 2.0L Misfire VIN: 3VW4T7AJ2F
P0304: miss4. hello iatn i got a head scratcher for ya. 2015 jetta 2.0t cpp with miss fires at idle high misfire counter on 3 and 4. things ive done, walnut shelled valves very dirty(carbon), replaced timing chain due to tensioner being out seven notches, replaced oil s...
April 08, 2021
2014 Dodge Avenger R/T 3.6L Misfire VIN: 1C3CDZBG6E
P0304: Cylinder 4 misfire. This one has me scratching my head. Misfire on cylinder 4 only at idle. Under load, it runs fine and scanner doesn't count any misfires. I've swapped coils, spark plugs, and fuel injectors with no change. I've verified the misfire is actually on cylinder 4...
April 21, 2021
2012 Hyundai Veracruz GLS 3.8L Misfire, MIL Lamp on VIN: KM8NU4CC5C
P0304: Cylinder 4 Misfire. Need someone know the Hyundai ECM diagnose strategy and responses. This vehicle came from the other shop. They replaced all the spark plugs and some ignition coils, but still have the codes for misfiring. Only in the cold start, the data shows small ...
April 23, 2021
2010 Mini Cooper Clubman 1.6L Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on VIN: WMWML3C53A
P0304: Misfire cylinder 4. Vehicle was towed in because it runs extremely rough. I replaced the thermostat because of the fault related to it but the misfires are still present. It misfires hard on all 4 cylinders at idle. When revving engine it smoothens out. Checked for intake and...
April 23, 2021