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P0304 Diagnostic Trouble Code Discussion for January 2005

Cylinder 4 Misfire Detected


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Trouble Ticket Help Requests for DTC P0304
Help Request Posted
2001 Mazda MPV DX 2.5L Excessive Emissions VIN: JM3LW28Y11
P0304: Cylinder 4 Misfire Detected. My question is, is there a common problem that will cause both #1 O2 sensors to read bad at the same time? I have seen this on Fords and have fixed vaccum lines to repair this problem without replacing O2 sensors. This vehicle has never had a tune-up. That is ...
January 12, 2005
1996 Subaru Legacy GT 2.5L Misfire, MIL Lamp on VIN: 4S3G8685XT
P0304: Cylinder 4 Misfire Detected. ... missfire during warm up(after driving for aprox. 5-15 min.). only missfires for 1-2 min. until check engine light comes on(we get a code P0304 cyl #4 missfire)vehicle will not missfire again until it cools completelywe have replaced head gaskets because we...
January 20, 2005
1997 Ford E-350 Econoline 5.4L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1FDKE37L3V
P0304: Misfire 4 Cylinder. Hello all. This headache was towed in unable to start. A quick check showed a lack of fuel problem so the first check was the fuel filter. It was clogged solid - could not blow through it at all! Replaced fuel filter and was able to get vehicle started. vehicl...
January 25, 2005
1997 Ford E-350 Econoline 5.4L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1FDKE37L3V
P0304: Misfire 4 Cylinder. Hello all. This headache was towed in unable to start. A quick check showed a lack of fuel problem so the first check was the fuel filter. It was clogged solid - could not blow through it at all! Replaced fuel filter and was able to get vehicle started. vehicl...
January 26, 2005
1999 Lincoln Town Car Executive 4.6L Misfire VIN: 1LNHM81W7X
P0304: Cylinder missfire 4. Hello Lincoln/Ford Techs: I have this town car that originally came in with a cyl 4 missfire.It was caused by antifreeze coming out of the heater hose just above the #4 coil. There was some grime on the coil. Cleaned and monitored the miss recognition. No miss...
January 30, 2005
2003 Dodge Ram 1500 Truck 4.7L MIL Lamp on VIN: 1D7HU16N13
P0304: Cylinder 4 Misfire Detected. This truck has been here three times for misfire codes. Different cylinders each time but always a code PO300. I can watch the misfire numbers climb on all cylinders if I run the engine at 1000 RPM in nuetral hot engine. I have not tried it cold. All the freez...
January 31, 2005
2001 Mazda MPV DX 2.5L Excessive Emissions VIN: JM3LW28Y11
P0304: Cylinder 4 Misfire Detected. My question is, is there a common problem that will cause both #1 O2 sensors to read bad at the same time? I have seen this on Fords and have fixed vaccum lines to repair this problem without replacing O2 sensors. This vehicle has never had a tune-up. That is ...
January 12, 2005
1996 Subaru Legacy GT 2.5L Misfire, MIL Lamp on VIN: 4S3G8685XT
P0304: Cylinder 4 Misfire Detected. ... missfire during warm up(after driving for aprox. 5-15 min.). only missfires for 1-2 min. until check engine light comes on(we get a code P0304 cyl #4 missfire)vehicle will not missfire again until it cools completelywe have replaced head gaskets because we...
January 20, 2005
1997 Ford E-350 Econoline 5.4L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1FDKE37L3V
P0304: Misfire 4 Cylinder. Hello all. This headache was towed in unable to start. A quick check showed a lack of fuel problem so the first check was the fuel filter. It was clogged solid - could not blow through it at all! Replaced fuel filter and was able to get vehicle started. vehicl...
January 25, 2005
1997 Ford E-350 Econoline 5.4L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1FDKE37L3V
P0304: Misfire 4 Cylinder. Hello all. This headache was towed in unable to start. A quick check showed a lack of fuel problem so the first check was the fuel filter. It was clogged solid - could not blow through it at all! Replaced fuel filter and was able to get vehicle started. vehicl...
January 26, 2005
1999 Lincoln Town Car Executive 4.6L Misfire VIN: 1LNHM81W7X
P0304: Cylinder missfire 4. Hello Lincoln/Ford Techs: I have this town car that originally came in with a cyl 4 missfire.It was caused by antifreeze coming out of the heater hose just above the #4 coil. There was some grime on the coil. Cleaned and monitored the miss recognition. No miss...
January 30, 2005
2003 Dodge Ram 1500 Truck 4.7L MIL Lamp on VIN: 1D7HU16N13
P0304: Cylinder 4 Misfire Detected. This truck has been here three times for misfire codes. Different cylinders each time but always a code PO300. I can watch the misfire numbers climb on all cylinders if I run the engine at 1000 RPM in nuetral hot engine. I have not tried it cold. All the freez...
January 31, 2005