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P0304 Diagnostic Trouble Code Discussion for January 2012

Cylinder 4 Misfire Detected


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Trouble Ticket Help Requests for DTC P0304
Help Request Posted
2005 Audi A6 Quattro 3.2L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: WAUDT74F95
P0304: cylinder 4 misfire. ok when this car came in i swapped coils and plugs to other cylinders and car hasen't misfired yet also checked for vacuum leaks with both carb cleaner and butane none found.then i removed intake runner sensor connector to check for power i only get 5 volts at...
January 04, 2012
2005 Ford F-150 FX4 5.4L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1FTPX14565
P0304: testing and results. Truck has random misfires pretty much all the time only on bank 1. Cylinder #3 seemed worse when truck came in. Tried coil, replaced spark plug with no change. Switched fuel injectors between cylinder #2 & #3. Misfire moved to cyl. #2. Replaced all injecto...
January 04, 2012
2005 Audi A6 Quattro 3.2L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: WAUDT74F95
P0304: cylinder 4 misfire. ok when this car came in i swapped coils and plugs to other cylinders and car hasen't misfired yet also checked for vacuum leaks with both carb cleaner and butane none found.then i removed intake runner sensor connector to check for power i only get 5 volts at...
January 05, 2012
2001 Ford Explorer Limited 4.0L Misfire VIN: 1FMZU75EX1
P0304: cylinder 4 misfire. vehicle has misfire on start up. miss clears up within a few seconds. have replaced coil, wire, injector, and plug. it is a overhead cam engine.
January 06, 2012
1999 Subaru Legacy L 2.2L MIL Lamp on VIN: 4S3BD4357X
P0304: Cylinder 4 Misfire Detected. Customer only concern is MIL to pass inspection. There is no symptom of misfire detected, but light can be blinking. Initial test could not verify misfires, but spark plugs and wires very old and worn, and wires saturated with oil due to leaking tube seals. We...
January 06, 2012
1999 Ford F-250 Super Duty Lariat 5.4L Misfire VIN: 1FTNW21LXX
P0304: Fault Cylinder 4 Misfire Detected. ... complaint. Scanned and got a P0304. Checked compression)ok.CHecked for power to coil)ok. Tech changed spark plug and Coil, Noid light confirmed power to injector. Cleared code and test drove, Miss and Code came back. Replaced injector, cleared code and tes...
January 09, 2012
2004 Ford F-150 Lariat 5.4L Misfire VIN: 1FTPW12574
P0304: misfire on 4. the engine has a misfire at idle on #4. it misfires up to around 2000 to 2500 rpms. fire out of coil is good. injector pulse seems fine. the compression is same as other cylinders [125psi].during the cranking compression test the #4 cylinder builds same as oth...
January 10, 2012
2001 Chrysler Concorde LX 2.7L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2C3HD46R41
P0304: Cylinder 4 Misfire Detected. ... first post so bear with me. just installed new j@sper engine in this vehicle it will misfire cold and seems to run a little rough most of the time and sets the mil for p0304, swaped coil, new plug, smoked intake cold no leaks found, new injector #4.scoped ...
January 12, 2012
2003 Volkswagen Passat GLS 1.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: WVWPD63B43
P0304: . ... complaint and a vac noise with p0303 #3 misfire , p0507 idle higher than expected and p0171 bank 1 lean smoked test found a leak in a plastic elbow under the intake replaced the elbow and the # 3 coil (cop) after repairs the id...
January 17, 2012
1999 Ford F-250 Super Duty Lariat 5.4L Misfire VIN: 1FTNW21LXX
P0304: Fault Cylinder 4 Misfire Detected. ... complaint. Scanned and got a P0304. Checked compression)ok.CHecked for power to coil)ok. Tech changed spark plug and Coil, Noid light confirmed power to injector. Cleared code and test drove, Miss and Code came back. Replaced injector, cleared code and tes...
January 19, 2012
2006 Lincoln Navigator Ultimate 5.4L Misfire VIN: 5LMFU28576
P0304: cylinder 4 missfire. came to us with a bad miss on 4 under a load. it starts with a slight spark knock just before it goes into a complete miss on cyl. 4. we have checked running compression wich is good, exh. back press. is below 1 psi. We also did a induction cleaning just to ...
January 23, 2012
2005 Jaguar S-Type Sport 4.2L Misfire VIN: SAJWA01U25
P0304: misfire cyl 4. ... some of you can enlighten me on. This Jag came in with an obvious misfire. The customer stated that after taking it to the local Jag dealer, they recomended replacing the number 5 and 6 ignition coils. We advised doing our own diagnostic before the repair,...
January 25, 2012
2005 Audi A6 Quattro 3.2L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: WAUDT74F95
P0304: cylinder 4 misfire. ok when this car came in i swapped coils and plugs to other cylinders and car hasen't misfired yet also checked for vacuum leaks with both carb cleaner and butane none found.then i removed intake runner sensor connector to check for power i only get 5 volts at...
January 04, 2012
2005 Ford F-150 FX4 5.4L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1FTPX14565
P0304: testing and results. Truck has random misfires pretty much all the time only on bank 1. Cylinder #3 seemed worse when truck came in. Tried coil, replaced spark plug with no change. Switched fuel injectors between cylinder #2 & #3. Misfire moved to cyl. #2. Replaced all injecto...
January 04, 2012
2005 Audi A6 Quattro 3.2L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: WAUDT74F95
P0304: cylinder 4 misfire. ok when this car came in i swapped coils and plugs to other cylinders and car hasen't misfired yet also checked for vacuum leaks with both carb cleaner and butane none found.then i removed intake runner sensor connector to check for power i only get 5 volts at...
January 05, 2012
2001 Ford Explorer Limited 4.0L Misfire VIN: 1FMZU75EX1
P0304: cylinder 4 misfire. vehicle has misfire on start up. miss clears up within a few seconds. have replaced coil, wire, injector, and plug. it is a overhead cam engine.
January 06, 2012
1999 Subaru Legacy L 2.2L MIL Lamp on VIN: 4S3BD4357X
P0304: Cylinder 4 Misfire Detected. Customer only concern is MIL to pass inspection. There is no symptom of misfire detected, but light can be blinking. Initial test could not verify misfires, but spark plugs and wires very old and worn, and wires saturated with oil due to leaking tube seals. We...
January 06, 2012
1999 Ford F-250 Super Duty Lariat 5.4L Misfire VIN: 1FTNW21LXX
P0304: Fault Cylinder 4 Misfire Detected. ... complaint. Scanned and got a P0304. Checked compression)ok.CHecked for power to coil)ok. Tech changed spark plug and Coil, Noid light confirmed power to injector. Cleared code and test drove, Miss and Code came back. Replaced injector, cleared code and tes...
January 09, 2012
2004 Ford F-150 Lariat 5.4L Misfire VIN: 1FTPW12574
P0304: misfire on 4. the engine has a misfire at idle on #4. it misfires up to around 2000 to 2500 rpms. fire out of coil is good. injector pulse seems fine. the compression is same as other cylinders [125psi].during the cranking compression test the #4 cylinder builds same as oth...
January 10, 2012
2001 Chrysler Concorde LX 2.7L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2C3HD46R41
P0304: Cylinder 4 Misfire Detected. ... first post so bear with me. just installed new j@sper engine in this vehicle it will misfire cold and seems to run a little rough most of the time and sets the mil for p0304, swaped coil, new plug, smoked intake cold no leaks found, new injector #4.scoped ...
January 12, 2012
2003 Volkswagen Passat GLS 1.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: WVWPD63B43
P0304: . ... complaint and a vac noise with p0303 #3 misfire , p0507 idle higher than expected and p0171 bank 1 lean smoked test found a leak in a plastic elbow under the intake replaced the elbow and the # 3 coil (cop) after repairs the id...
January 17, 2012
1999 Ford F-250 Super Duty Lariat 5.4L Misfire VIN: 1FTNW21LXX
P0304: Fault Cylinder 4 Misfire Detected. ... complaint. Scanned and got a P0304. Checked compression)ok.CHecked for power to coil)ok. Tech changed spark plug and Coil, Noid light confirmed power to injector. Cleared code and test drove, Miss and Code came back. Replaced injector, cleared code and tes...
January 19, 2012
2006 Lincoln Navigator Ultimate 5.4L Misfire VIN: 5LMFU28576
P0304: cylinder 4 missfire. came to us with a bad miss on 4 under a load. it starts with a slight spark knock just before it goes into a complete miss on cyl. 4. we have checked running compression wich is good, exh. back press. is below 1 psi. We also did a induction cleaning just to ...
January 23, 2012
2005 Jaguar S-Type Sport 4.2L Misfire VIN: SAJWA01U25
P0304: misfire cyl 4. ... some of you can enlighten me on. This Jag came in with an obvious misfire. The customer stated that after taking it to the local Jag dealer, they recomended replacing the number 5 and 6 ignition coils. We advised doing our own diagnostic before the repair,...
January 25, 2012