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P0304 Diagnostic Trouble Code Discussion for October 2013

Cylinder 4 Misfire Detected


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Trouble Ticket Help Requests for DTC P0304
Help Request Posted
2001 Lincoln LS 3.9L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1LNHM87A01
P0304: Misfire Cylinder 4. I'm getting a P0304, P0303, and P0300 stored in memory. The car runs rough at idle, Fuel Trims show bank 1 as -25% and bank 2 as +25%. I have replaced all spark plugs and #4 coil with no change. EGR Valve is functioning correctly with no leakage. No excessive ...
October 08, 2013
2008 Volkswagen Passat Komfort 2.0L Misfire, MIL Lamp on VIN: WVWAK73C58
P0304: cylinder 4 misfire. ... rough running problem, after first scan and misfire monitering we had cyl. 3 was dead, and intermittent codes for cyl. 1 and cyl. 4 misfires. after swapping plugs and coils around and a compression test we diagnosed faulty fuel injector. installed all new...
October 09, 2013
2004 Toyota Sequoia SR5 4.7L Poor Idle Quality, Misfire VIN: 5TDBT44A44
P0304: Cylinder 4 Misfire Detected. The customer towed this one in because they heard a loud noise and the vehicle began running rough. Codes were the misfire codes above. Further diag we found the timing belt/marks jumped 5 teeth on the bank 2 cylinder head. We then removed the timing belt to c...
October 16, 2013
2002 Volkswagen Jetta GL 2.0L Misfire VIN: 3VWRB69M72
P0304: 4 Misfire. Car arrived with the listed codes stored. Also had a coolant temp code stored. Ran very poorly. Started by checking the basics. Had spark and injector pulse on all 4 holes. Plugs and wires were original, so we replaced them with OE parts. Also replaced the the...
October 21, 2013
2004 Subaru Impreza WRX 2.0L Misfire, MIL Lamp on VIN: JF1GD29664
P0304: Cylinder 4 Misfire Detected. I'm trying to help a good friend out. His car runs extremely rough. CEL blinks under load, misfires consistently. Pulled codes and found misfires in all cylinders. I don't want him to spend a bunch of money throwing parts at this car so we did some testing. We...
October 28, 2013
2003 Honda Civic EX 1.7L Misfire, MIL Lamp on VIN: 1HGEM21993
P0304: Cylinder 4 Misfire Detected. Client replaced spark plugs with new OE plugs, still misfires, test drove fully warmed up, engine misfires at 2000-3000 rpm, at very light load, does not misfire any higher or at idle or heavier loads, all scan data readings look normal while misfiring, plugs ...
October 29, 2013
2004 Subaru Impreza WRX 2.0L Misfire, MIL Lamp on VIN: JF1GD29664
P0304: Cylinder 4 Misfire Detected. I'm trying to help a good friend out. His car runs extremely rough. CEL blinks under load, misfires consistently. Pulled codes and found misfires in all cylinders. I don't want him to spend a bunch of money throwing parts at this car so we did some testing. We...
October 29, 2013
2005 Jeep Liberty Renegade 3.7L Misfire, MIL Lamp on VIN: 1J4GL38KX5
P0304: Misfire Detected Cylinder 4. this jeep came in for check engine light on found cat to be bad and also has miss fire on number 4 cylinder.misfire is most noticeable at idle high way speeds you feel nothing.verified mis with scanner on number4.i swapped plugs and coil and injector to see if...
October 30, 2013
2001 Lincoln LS 3.9L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1LNHM87A01
P0304: Misfire Cylinder 4. I'm getting a P0304, P0303, and P0300 stored in memory. The car runs rough at idle, Fuel Trims show bank 1 as -25% and bank 2 as +25%. I have replaced all spark plugs and #4 coil with no change. EGR Valve is functioning correctly with no leakage. No excessive ...
October 08, 2013
2008 Volkswagen Passat Komfort 2.0L Misfire, MIL Lamp on VIN: WVWAK73C58
P0304: cylinder 4 misfire. ... rough running problem, after first scan and misfire monitering we had cyl. 3 was dead, and intermittent codes for cyl. 1 and cyl. 4 misfires. after swapping plugs and coils around and a compression test we diagnosed faulty fuel injector. installed all new...
October 09, 2013
2004 Toyota Sequoia SR5 4.7L Poor Idle Quality, Misfire VIN: 5TDBT44A44
P0304: Cylinder 4 Misfire Detected. The customer towed this one in because they heard a loud noise and the vehicle began running rough. Codes were the misfire codes above. Further diag we found the timing belt/marks jumped 5 teeth on the bank 2 cylinder head. We then removed the timing belt to c...
October 16, 2013
2002 Volkswagen Jetta GL 2.0L Misfire VIN: 3VWRB69M72
P0304: 4 Misfire. Car arrived with the listed codes stored. Also had a coolant temp code stored. Ran very poorly. Started by checking the basics. Had spark and injector pulse on all 4 holes. Plugs and wires were original, so we replaced them with OE parts. Also replaced the the...
October 21, 2013
2004 Subaru Impreza WRX 2.0L Misfire, MIL Lamp on VIN: JF1GD29664
P0304: Cylinder 4 Misfire Detected. I'm trying to help a good friend out. His car runs extremely rough. CEL blinks under load, misfires consistently. Pulled codes and found misfires in all cylinders. I don't want him to spend a bunch of money throwing parts at this car so we did some testing. We...
October 28, 2013
2003 Honda Civic EX 1.7L Misfire, MIL Lamp on VIN: 1HGEM21993
P0304: Cylinder 4 Misfire Detected. Client replaced spark plugs with new OE plugs, still misfires, test drove fully warmed up, engine misfires at 2000-3000 rpm, at very light load, does not misfire any higher or at idle or heavier loads, all scan data readings look normal while misfiring, plugs ...
October 29, 2013
2004 Subaru Impreza WRX 2.0L Misfire, MIL Lamp on VIN: JF1GD29664
P0304: Cylinder 4 Misfire Detected. I'm trying to help a good friend out. His car runs extremely rough. CEL blinks under load, misfires consistently. Pulled codes and found misfires in all cylinders. I don't want him to spend a bunch of money throwing parts at this car so we did some testing. We...
October 29, 2013
2005 Jeep Liberty Renegade 3.7L Misfire, MIL Lamp on VIN: 1J4GL38KX5
P0304: Cylinder 4 Misfire Detected. this jeep came in for check engine light on found cat to be bad and also has miss fire on number 4 cylinder.misfire is most noticeable at idle high way speeds you feel nothing.verified mis with scanner on number4.i swapped plugs and coil and injector to see if...
October 30, 2013