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P0304 Diagnostic Trouble Code Discussion for February 2018

Cylinder 4 Misfire Detected


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Trouble Ticket Help Requests for DTC P0304
Help Request Posted
2006 Hyundai Santa Fe GLS 3.5L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: KM8SC13E36
P0304: Cylinder 4 Misfire Detected. Hey guys I have an issue with misfires after customer requested a tune up. replace spark plugs and wire set as the customer requested. afterword's the PCM is throwing p0300-p0306, randomly throwing codes and taking them away. car is not misfiring when this hap...
February 08, 2018
2009 Subaru Impreza Outback Sport 2.5L Misfire, misfires over 4500rp VIN: JF1GH63689
P0304: misfire number 4 cylinder. Thank you in advance for any help that you folks can give. We have a weird one. This 2009 Subaru Imprezza 2.5 liter 4cyl with just under 100k miles normally aspirated engine throws misfire codes for cylinders 3 and 4 when the motor gets over 4500rpm while ...
February 15, 2018
2013 Ford F-150 FX4 5.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FTFX1EF2D
P0304: Cylinder 4 Misfire. We have this 13 Ford F150 with the 5.0. On cold start we have a misfire on cylinder number 4 that after about 45 seconds will disappear. Compression is perfect. Smoked intake for leak and found none. Replaced plugs, coil and boot and number 4 injector. We have...
February 20, 2018
2009 Subaru Impreza Outback Sport 2.5L Misfire, misfires over 4500rp VIN: JF1GH63689
P0304: misfire number 4 cylinder. Thank you in advance for any help that you folks can give. We have a weird one. This 2009 Subaru Imprezza 2.5 liter 4cyl with just under 100k miles normally aspirated engine throws misfire codes for cylinders 3 and 4 when the motor gets over 4500rpm while ...
February 23, 2018
2009 Audi A5 Quattro 3.2L Poor Idle Quality, Misfire VIN: WAUDK7809A
P0304: Cylinder 4 Misfire. After repairs, now bank 2 LT fuel trims will go -25% and STFT will remain around -5 to -10% at idle. At cruise the LTFT's will remain around -10%. After idling for 5-10 minutes cyl#4 will misfire at idle and slightly off idle. At cruise no misfires. Cyl. c...
February 27, 2018