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P0304 Diagnostic Trouble Code Discussion for November 2006

Cylinder 4 Misfire Detected


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Trouble Ticket Help Requests for DTC P0304
Help Request Posted
2001 Ford Ranger Edge 3.0L Poor Idle Quality VIN: 1FTYR14U81
P0304: Cylinder 4 misfire. This truck idles rough at times, check engine light will come and go. We have replaced the #4 injector and the coil pack with no change. No vacuum leaks found, upper intake gasket new with injector. Some times it will idle very smooth, other times it will idle...
November 06, 2006
1998 Dodge Dakota 3.9L Poor Idle Quality, Misfire VIN: 1B7GG22X3W
P0304: Cylinder 4 Misfire Detected. ... check engine light and a P0304 #4 cylinder misfire, Secondary ignition is in good condition. Found intake leaking oil out the back and found engine 1/2 a quart low. Removed intake and found inner plenum gasket broken, reinstalled intake and misfire was sti...
November 09, 2006
2002 Honda S2000 2.0L Misfire, MIL Lamp on VIN: JHMAP114X2
P0304: Cylinder 4 Misfire Detected. Car was brought to me because it fail Illinois emission test. Has an idle miss seems to be on cylinder 4. Replaced plugs and adjusted valves. Found all exhaust valves a little tight. Did cylinder leakage and tests good on all cylinders. Compression is good. Di...
November 13, 2006
2001 Ford Ranger Edge 3.0L Poor Idle Quality VIN: 1FTYR14U81
P0304: Cylinder 4 misfire. This truck idles rough at times, check engine light will come and go. We have replaced the #4 injector and the coil pack with no change. No vacuum leaks found, upper intake gasket new with injector. Some times it will idle very smooth, other times it will idle...
November 15, 2006
1997 Volkswagen Jetta GLS 2.0L Stall, MIL Lamp on VIN: 3VWSA81H1V
P0304: 4 Cyl. Misfire Detected. ... on and codes P0722 and P0304. I can't find much info on this P0722 code. I have searched the Fix Database and Forum Archives with no luck. Shop Key doesn't list this code at all. I have cleared the codes and road tested to make sure the speedometer works a...
November 18, 2006
2002 Ford Taurus SE 3.0L Misfire VIN: 1FAHP53U32
... light on,codes were po304,p0305,p0316.I found if you pull the plug wires off at the coil,the RPMS do not drop for cylinders 4 and 6.It has fuel,injectors all drop the some(for the front bank).all have an injector pulse.All the spark patterns look good.Cran...
November 20, 2006
2000 Honda Accord EX 3.0L No Start, Misfire, MIL Lamp on VIN: 1HGCG1652Y
P0304: Cylinder 4 Misfire Detected. ... engine was barely running, low rpms. P0300, P0301, P0302, P0303, P0304, P0305, P0306. I rep...
November 20, 2006
2002 Subaru Impreza WRX 2.0L Misfire, MIL Lamp on VIN: JF1GD29642
P0304: Cylinder 4 Misfire Detected. I have never worked on one of these before and I feel lost. The owner said it has never been tuned so I thought that before I started trying to figure out what's wrong with it I should replace the spark plugs and fuel filter. Now for the first question: what d...
November 22, 2006
1997 Dodge Grand Caravan SE 3.3L Hesitation, Misfire, MIL Lamp on VIN: 1B4GP44R8V
P0304: Cylinder 4 Misfire Detected. ... states codes. Problem occures randomly. If I test drive it for several miles, it will act up after about 15 miles of highway driving. Checked wave-form on all injectors and everything looks good, do not see any voltage spikes on any of the circuits. All in...
November 27, 2006
2001 Ford Explorer XLT 5.0L Misfire VIN: 1FMZU63P61
P0304: Cylinder 4 misfire. Truck came in for misfire. Scanned and found multiple misfires on several cylinders. Found wires incorrectly routed and wire seperators all gone. Plug wires were routed using nylon wire ties and several had arc spots. Replaced wires and plugs, rerouted correct...
November 29, 2006
1998 Lincoln Continental 4.6L Misfire VIN: 1LNFM97V0W
P0304: Misfire cyl 4. Vehicle came to shop w/ engine misfire & check engine light on. Initial inspection found fault codes for cylinder misfire in cylinder #3 & #4. Found long term fuel trim reading lean. Further inspection found barometer out of specs for altitude. Found M...
November 29, 2006
2001 Ford Explorer XLT 5.0L Misfire VIN: 1FMZU63P61
P0304: Cylinder 4 misfire. Truck came in for misfire. Scanned and found multiple misfires on several cylinders. Found wires incorrectly routed and wire seperators all gone. Plug wires were routed using nylon wire ties and several had arc spots. Replaced wires and plugs, rerouted correct...
November 30, 2006
2001 Ford Ranger Edge 3.0L Poor Idle Quality VIN: 1FTYR14U81
P0304: Cylinder 4 misfire. This truck idles rough at times, check engine light will come and go. We have replaced the #4 injector and the coil pack with no change. No vacuum leaks found, upper intake gasket new with injector. Some times it will idle very smooth, other times it will idle...
November 06, 2006
1998 Dodge Dakota 3.9L Poor Idle Quality, Misfire VIN: 1B7GG22X3W
P0304: Cylinder 4 Misfire Detected. ... check engine light and a P0304 #4 cylinder misfire, Secondary ignition is in good condition. Found intake leaking oil out the back and found engine 1/2 a quart low. Removed intake and found inner plenum gasket broken, reinstalled intake and misfire was sti...
November 09, 2006
2002 Honda S2000 2.0L Misfire, MIL Lamp on VIN: JHMAP114X2
P0304: Cylinder 4 Misfire Detected. Car was brought to me because it fail Illinois emission test. Has an idle miss seems to be on cylinder 4. Replaced plugs and adjusted valves. Found all exhaust valves a little tight. Did cylinder leakage and tests good on all cylinders. Compression is good. Di...
November 13, 2006
2001 Ford Ranger Edge 3.0L Poor Idle Quality VIN: 1FTYR14U81
P0304: Cylinder 4 misfire. This truck idles rough at times, check engine light will come and go. We have replaced the #4 injector and the coil pack with no change. No vacuum leaks found, upper intake gasket new with injector. Some times it will idle very smooth, other times it will idle...
November 15, 2006
1997 Volkswagen Jetta GLS 2.0L Stall, MIL Lamp on VIN: 3VWSA81H1V
P0304: 4 Cyl. Misfire Detected. ... on and codes P0722 and P0304. I can't find much info on this P0722 code. I have searched the Fix Database and Forum Archives with no luck. Shop Key doesn't list this code at all. I have cleared the codes and road tested to make sure the speedometer works a...
November 18, 2006
2002 Ford Taurus SE 3.0L Misfire VIN: 1FAHP53U32
... light on,codes were po304,p0305,p0316.I found if you pull the plug wires off at the coil,the RPMS do not drop for cylinders 4 and 6.It has fuel,injectors all drop the some(for the front bank).all have an injector pulse.All the spark patterns look good.Cran...
November 20, 2006
2000 Honda Accord EX 3.0L No Start, Misfire, MIL Lamp on VIN: 1HGCG1652Y
P0304: Cylinder 4 Misfire Detected. ... engine was barely running, low rpms. P0300, P0301, P0302, P0303, P0304, P0305, P0306. I rep...
November 20, 2006
2002 Subaru Impreza WRX 2.0L Misfire, MIL Lamp on VIN: JF1GD29642
P0304: Cylinder 4 Misfire Detected. I have never worked on one of these before and I feel lost. The owner said it has never been tuned so I thought that before I started trying to figure out what's wrong with it I should replace the spark plugs and fuel filter. Now for the first question: what d...
November 22, 2006
1997 Dodge Grand Caravan SE 3.3L Hesitation, Misfire, MIL Lamp on VIN: 1B4GP44R8V
P0304: Cylinder 4 Misfire Detected. ... states codes. Problem occures randomly. If I test drive it for several miles, it will act up after about 15 miles of highway driving. Checked wave-form on all injectors and everything looks good, do not see any voltage spikes on any of the circuits. All in...
November 27, 2006
2001 Ford Explorer XLT 5.0L Misfire VIN: 1FMZU63P61
P0304: Cylinder 4 misfire. Truck came in for misfire. Scanned and found multiple misfires on several cylinders. Found wires incorrectly routed and wire seperators all gone. Plug wires were routed using nylon wire ties and several had arc spots. Replaced wires and plugs, rerouted correct...
November 29, 2006
1998 Lincoln Continental 4.6L Misfire VIN: 1LNFM97V0W
P0304: Misfire cyl 4. Vehicle came to shop w/ engine misfire & check engine light on. Initial inspection found fault codes for cylinder misfire in cylinder #3 & #4. Found long term fuel trim reading lean. Further inspection found barometer out of specs for altitude. Found M...
November 29, 2006
2001 Ford Explorer XLT 5.0L Misfire VIN: 1FMZU63P61
P0304: Cylinder 4 misfire. Truck came in for misfire. Scanned and found multiple misfires on several cylinders. Found wires incorrectly routed and wire seperators all gone. Plug wires were routed using nylon wire ties and several had arc spots. Replaced wires and plugs, rerouted correct...
November 30, 2006