Join Now
International Automotive Technicians Network

P0304 Diagnostic Trouble Code Discussion for September 2013

Cylinder 4 Misfire Detected


Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0304
Help Request Posted
2006 Nissan Sentra S 1.8L Misfire, MIL Lamp on VIN: 3N1CBD1D06
P0304: Cylinder 4 Misfire Detected. vehicle was towed in for a crank no start no communication with pcm found bad connection in harness suppling power to pcm repaired and found fuel pump was inop, replaced fuel pump when the car started ran poorly replaced spark plugs also had 1 bad coil recomme...
September 04, 2013
2008 Chevrolet Impala LS 3.5L Misfire, Poor Fuel Economy VIN: 2G1WB58K08
P0304: cylinder 4 misfire. this vehicle came in with no check engine light just a surge at idle. I checked codes and found a stored p0300. I checked the scan tool data and found a cylinder 4 misfire on a graph. Spark plugs had a large gap and burned up. I checked the spark and cylinder ...
September 05, 2013
2002 Dodge Ram 3500 Truck 5.9L Hesitation, Misfire, MIL Lamp on VIN: 2B7LB31Z92
P0304: Cylinder 4 Misfire Detected. Customer brought vehicle in with poor power and check engine light flashing. Found codes listed above. Somebody has done a tune up recently. Fuel pressure is around 45 psi and is steady, does not more when under load or idle. After driving van 3-5 minutes it o...
September 09, 2013
2004 Subaru Impreza WRX 2.0L Hesitation, Cuts out, Misfire, MIL Lamp on VIN: JF1GD29614
P0304: Cylinder 4 Misfire Detected. car came in from used car lot. heavy missfire cly 1.cked comp. on all cly all are about 125ish switched coil packs seemed to do same thing . st fuel trim is at +24 lt at 0. cannot find vacum leaks. switch out maf sensor no change. switched injectors no change....
September 10, 2013
2011 Toyota RAV4 2.5L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 2T3BF4DV6B
P0304: 4. ... in with p0300, p0301,p302,p303 and p304. Cleared codes. 1st drive MIL flashes and engine misses, (excessive fuel/cataylst damaging condition)p0301 and p0171. watched fuel trims in the bay, they would swing from over +20%...
September 11, 2013
1999 Honda Accord EX 2.3L Poor Idle Quality, Stall VIN: 1HGCG6671X
P0304: Cylinder 4 Misfire Detected. This car came into our shop with a low idle / stalls occasionally complaint. I cleaned the throttle body; replaced the idle control valve; adjusted the valve clearance. The spark plugs were recently replaced, and compression readings of 165 thru 175 were recor...
September 12, 2013
2003 Ford Ranger Edge 4.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FTZR45EX3
P0304: Misfire cyl 4. ... that was brought to me by one of my commercial customers. he was stumped so i got it. and i haven't had any luck with it yet either. it was purchased at auction so there is no known history other than what we have done. here's what it does. it starts up ...
September 13, 2013
2011 Toyota RAV4 2.5L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 2T3BF4DV6B
P0304: 4. ... in with p0300, p0301,p302,p303 and p304. Cleared codes. 1st drive MIL flashes and engine misses, (excessive fuel/cataylst damaging condition)p0301 and p0171. watched fuel trims in the bay, they would swing from over +20%...
September 13, 2013
2002 Honda Accord LX 2.3L Misfire VIN: 1HGCG56472
P0304: Cylinder 4 Misfire Detected. car came in about three weeks ago with a miss cond. same three codes came up and it was missing at the time, replaced spark plugs and cured the miss. car came in today with a miss and the same three codes for misfire, replaced spark plugs , did not fix it. I h...
September 16, 2013
2008 Mini Cooper S 1.6L MIL Lamp on VIN: WMWMF73558
P0304: testing and results. This vehicle came into me misfiring on all cylinders, runs very rough all the time. Checked fuel pressure @ tank 45psi. checked high pressure fuel on scanner and it sits around 680 - 700 at idle. spec says its around 725psi(doesnt say how much tolerance)Lab sc...
September 18, 2013
2001 Volkswagen EuroVan MV 2.8L Misfire, MIL Lamp on VIN: WV3AB47011
P0304: testing and results. Ok I would like to thank you all in advance for this one... I have been pulling out my hair on this. I am not too familiar with the VW motors and this one is really throwing me for a loop. Its a VR6 DOHC. Van came in with customer stating that it intermittent...
September 20, 2013
2006 Chevrolet Aveo LS 1.6L Hesitation, Cuts out, MIL Lamp on, MIL flashing VIN: KL1TD66626
P0304: Cylinder 4 Misfire Detected. ... customer said ran ok, felt like misfire. Requested tuneup. Pulled ignition wires found spark plug tubes half full of oil. Code P2680-could not find a description on scan tool, IATN, AllDATA, or Google. Replaced plugs, wires, ...
September 30, 2013
2008 Chevrolet Impala LS 3.5L Misfire, Poor Fuel Economy VIN: 2G1WB58K08
P0304: cylinder 4 misfire. this vehicle came in with no check engine light just a surge at idle. I checked codes and found a stored p0300. I checked the scan tool data and found a cylinder 4 misfire on a graph. Spark plugs had a large gap and burned up. I checked the spark and cylinder ...
September 30, 2013
2006 Nissan Sentra S 1.8L Misfire, MIL Lamp on VIN: 3N1CBD1D06
P0304: Cylinder 4 Misfire Detected. vehicle was towed in for a crank no start no communication with pcm found bad connection in harness suppling power to pcm repaired and found fuel pump was inop, replaced fuel pump when the car started ran poorly replaced spark plugs also had 1 bad coil recomme...
September 04, 2013
2008 Chevrolet Impala LS 3.5L Misfire, Poor Fuel Economy VIN: 2G1WB58K08
P0304: cylinder 4 misfire. ... engine light just a surge at idle. I checked codes and found a stored p0300. I checked the scan tool data and found a cylinder 4 misfire on a graph. Spark plugs had a large gap and burned up. I checked the spark and cylinder had spark. I replaced the spark...
September 05, 2013
2002 Dodge Ram 3500 Truck 5.9L Hesitation, Misfire, MIL Lamp on VIN: 2B7LB31Z92
P0304: Cylinder 4 Misfire Detected. Customer brought vehicle in with poor power and check engine light flashing. Found codes listed above. Somebody has done a tune up recently. Fuel pressure is around 45 psi and is steady, does not more when under load or idle. After driving van 3-5 minutes it o...
September 09, 2013
2004 Subaru Impreza WRX 2.0L Hesitation, Cuts out, Misfire, MIL Lamp on VIN: JF1GD29614
P0304: Cylinder 4 Misfire Detected. car came in from used car lot. heavy missfire cly 1.cked comp. on all cly all are about 125ish switched coil packs seemed to do same thing . st fuel trim is at +24 lt at 0. cannot find vacum leaks. switch out maf sensor no change. switched injectors no change....
September 10, 2013
2011 Toyota RAV4 2.5L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 2T3BF4DV6B
P0304: 4. ... p304. Cleared codes. 1st drive MIL flashes and engine misses, (excessive fuel/cataylst damaging condition)p0301 and p0171. watched fuel trims in the bay, they would swing from over +20%...
September 11, 2013
1999 Honda Accord EX 2.3L Poor Idle Quality, Stall VIN: 1HGCG6671X
P0304: Cylinder 4 Misfire Detected. This car came into our shop with a low idle / stalls occasionally complaint. I cleaned the throttle body; replaced the idle control valve; adjusted the valve clearance. The spark plugs were recently replaced, and compression readings of 165 thru 175 were recor...
September 12, 2013
2003 Ford Ranger Edge 4.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FTZR45EX3
P0304: Misfire cyl 4. ... that was brought to me by one of my commercial customers. he was stumped so i got it. and i haven't had any luck with it yet either. it was purchased at auction so there is no known history other than what we have done. here's what it does. it starts up ...
September 13, 2013
2011 Toyota RAV4 2.5L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 2T3BF4DV6B
P0304: 4. ... p304. Cleared codes. 1st drive MIL flashes and engine misses, (excessive fuel/cataylst damaging condition)p0301 and p0171. watched fuel trims in the bay, they would swing from over +20%...
September 13, 2013
2002 Honda Accord LX 2.3L Misfire VIN: 1HGCG56472
P0304: Cylinder 4 Misfire Detected. car came in about three weeks ago with a miss cond. same three codes came up and it was missing at the time, replaced spark plugs and cured the miss. car came in today with a miss and the same three codes for misfire, replaced spark plugs , did not fix it. I h...
September 16, 2013
2008 Mini Cooper S 1.6L MIL Lamp on VIN: WMWMF73558
P0304: testing and results. This vehicle came into me misfiring on all cylinders, runs very rough all the time. Checked fuel pressure @ tank 45psi. checked high pressure fuel on scanner and it sits around 680 - 700 at idle. spec says its around 725psi(doesnt say how much tolerance)Lab sc...
September 18, 2013
2001 Volkswagen EuroVan MV 2.8L Misfire, MIL Lamp on VIN: WV3AB47011
P0304: testing and results. Ok I would like to thank you all in advance for this one... I have been pulling out my hair on this. I am not too familiar with the VW motors and this one is really throwing me for a loop. Its a VR6 DOHC. Van came in with customer stating that it intermittent...
September 20, 2013
2006 Chevrolet Aveo LS 1.6L Hesitation, Cuts out, MIL Lamp on, MIL flashing VIN: KL1TD66626
P0304: Cylinder 4 Misfire Detected. ... customer said ran ok, felt like misfire. Requested tuneup. Pulled ignition wires found spark plug tubes half full of oil. Code P2680-could not find a description on scan tool, IATN, AllDATA, or Google. Replaced plugs, wires, ...
September 30, 2013
2008 Chevrolet Impala LS 3.5L Misfire, Poor Fuel Economy VIN: 2G1WB58K08
P0304: cylinder 4 misfire. ... engine light just a surge at idle. I checked codes and found a stored p0300. I checked the scan tool data and found a cylinder 4 misfire on a graph. Spark plugs had a large gap and burned up. I checked the spark and cylinder had spark. I replaced the spark...
September 30, 2013