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P0304 Diagnostic Trouble Code Discussion for September 2010

Cylinder 4 Misfire Detected


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Trouble Ticket Help Requests for DTC P0304
Help Request Posted
2006 Isuzu N NPR-HD 5.2L Excessive Emissions, Hesitation, Misfire VIN: JALC4B1687
P0304: 4 cylinder misfire. ... stumbles, clears up, fuel okay, valves adjusted, no EGR codes, just P0304, no MIL light. Isuzu maintenance manual states a defective injector, or partially siezed cylinder contributes to the P0304. Can not perform a cylinder contribution test, am leaning t...
September 01, 2010
2004 Ford Ranger Edge 3.0L Misfire, MIL Lamp on VIN: 1FTYR10U4P
P0304: misfire cylinder 4. ... p0304 and p0316. Did the normal checks and found that cylinder #4 had repeated, but intermittant, misfire. Swapped plug wires and plugs from cylinder 4 to other cylinders to isolate fault in these components. Swapped wire positions at coil too. Misfire rem...
September 08, 2010
2000 Toyota Tacoma Pre Runner 2.7L MIL Lamp on VIN: 4TAWM72N4Y
P0304: Cylinder 4 Misfire Detected. Smoked intake system for leaks found leak @ T/B gasket, R&R gasket and cleaned throttle body unit heavy carbon buildup. Jumped pins E1 and TE1 on DLC in engine compartment and RPM didn't increase; verified power, ground and signal to IAC valve. Removed IAC...
September 09, 2010
2004 Volkswagen Passat GLS 1.8L Poor Idle Quality, Misfire VIN: WVWPD63B54
P0304: . The car runs very poorly at idle only. Lots of DTC codes, mainly P030X for misfires, but also if you wait long enough I'll get codes for too lean mixtures. The car came from dealer who recommended to replace the whole car... Crankcase elbow pipe on block was ...
September 16, 2010
2000 Toyota Tacoma Pre Runner 2.7L MIL Lamp on VIN: 4TAWM72N4Y
P0304: Cylinder 4 Misfire Detected. Smoked intake system for leaks found leak @ T/B gasket, R&R gasket and cleaned throttle body unit heavy carbon buildup. Jumped pins E1 and TE1 on DLC in engine compartment and RPM didn't increase; verified power, ground and signal to IAC valve. Removed IAC...
September 20, 2010
2003 Porsche 911 Carrera 3.6L Misfire VIN: WPOCA29923
P0304: misfire cylinder 4. customer brought car in for check engine light repair.(see codes) customer took car to another shop for prior work. they replaced the spark plugs. replace ignition coil (cylinder 4) and fuel injector (cylinder 4) now brought there problem to us. cleared codes ...
September 21, 2010
2001 Kia Sephia 1.8L Surge, Misfire, MIL Lamp on VIN: KNAFB12191
P0304: Cylinder 4 Misfire Detected. After timing belt replacement and tune-up, cust. says engine surges and loses power at times. Mostly during 55 mph steady cruise, and at times under accel. I was able to duplicate this condition one time. When it did happen, O2 volts were very low (lean), fue...
September 22, 2010
2003 Porsche 911 Carrera 3.6L Misfire VIN: WPOCA29923
P0304: misfire cylinder 4. customer brought car in for check engine light repair.(see codes) customer took car to another shop for prior work. they replaced the spark plugs. replace ignition coil (cylinder 4) and fuel injector (cylinder 4) now brought there problem to us. cleared codes ...
September 22, 2010
2001 Kia Sephia 1.8L Surge, Misfire, MIL Lamp on VIN: KNAFB12191
P0304: Cylinder 4 Misfire Detected. After timing belt replacement and tune-up, cust. says engine surges and loses power at times. Mostly during 55 mph steady cruise, and at times under accel. I was able to duplicate this condition one time. When it did happen, O2 volts were very low (lean), fue...
September 23, 2010
1998 Mercury Mystique LS 2.5L Surge VIN: 1MELM66L2W
P0304: Cylinder 4 misfire detected. Customer came back 2 days later with complaints that the car has a high idle. We checked the car with the customer here, unplugged the IAC and the problem went right away. replaced Iac (ford part) and problem persisted. Symptoms only occur in drive, not in par...
September 27, 2010
2007 Suzuki XL-7 Luxury 3.6L Excessive Emissions, Misfire, MIL Lamp on VIN: 2S3DA21777
P0304: Cylinder 4 Misfire Detected. I have a MODIS. Worked on this 1 week ago.No Suzuki avail. Performing diag Gen OBDII. Codes received are as follows. PO050, PO154, PO008, PO300, PO304, PO306, PO302. When vehicle came in is was running rough and black smoke from exhaust. Fuel Trim numbers were...
September 29, 2010