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P0304 Diagnostic Trouble Code Discussion for April 2015

Cylinder 4 Misfire Detected


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Trouble Ticket Help Requests for DTC P0304
Help Request Posted
2006 Honda Pilot EX 3.5L bad throttle respons VIN: 5FNYF28436
P0304: Cylinder 4 Misfire Detected. CEL comes on when the engine rpms go up to 1700 and the throttle will be very sluggish-will raise rpms slowly. Customer is not able to drive at all. The engine is turned off for a second and on restart everything seems fine. Engine runs smooth and misfire code...
April 06, 2015
2000 Acura TL 3.2L No Start, Misfire, MIL Lamp on VIN: 19UUA5663Y
P0304: Cylinder 4 Misfire Detected. Good afternoon, this problem began serveral months ago as far as we can tell. Customer reported MIL - we verified misfires and installed a set of NGK spark plugs ( as recommended by Worldpak ). A few months later, misfires again, we installed a set of ignition...
April 07, 2015
2000 Acura TL 3.2L No Start, Misfire, MIL Lamp on VIN: 19UUA5663Y
P0304: Cylinder 4 Misfire Detected. Good afternoon, this problem began serveral months ago as far as we can tell. Customer reported MIL - we verified misfires and installed a set of NGK spark plugs ( as recommended by Worldpak ). A few months later, misfires again, we installed a set of ignition...
April 11, 2015
2006 Honda Pilot EX 3.5L bad throttle respons VIN: 5FNYF28436
P0304: Cylinder 4 Misfire Detected. CEL comes on when the engine rpms go up to 1700 and the throttle will be very sluggish-will raise rpms slowly. Customer is not able to drive at all. The engine is turned off for a second and on restart everything seems fine. Engine runs smooth and misfire code...
April 13, 2015
1999 Mercury Villager Estate 3.3L Misfire VIN: 4M2XV11T5X
P0304: Cylinder 4 Misfire Detected. I have a 1999 Villager that will stop firing injector 4. The injector is new. All wiring has been verified. When it stops firing the injector it has 14 volts at the computer so I know the circuit is not open. The ECM has been swapped too. I have scoped it, loo...
April 15, 2015
2001 Honda CR-V EX 2.0L Misfire, MIL Lamp on, MIL Flashes VIN: JHLRD18621
P0304: Cylinder 4 Misfire Detected. This one is driving us crazy. First off the car seems to run and idle perfectly. We had done a few maintenance items including a valve adjustment, timing belt kit-Conti-spark plugs, wires etc. It flashes the MIL at idle and while driving. We had installed a ne...
April 21, 2015
2008 Toyota Prius Touring 1.5L Misfire, MIL Lamp on VIN: JTDKB20UX8
P0304: . P0304 code on acceleration
April 22, 2015
2002 Subaru Impreza WRX 2.0L Hesitation, Cuts out, Misfire VIN: JF1GD29672
P0304: Cylinder 4 Misfire Detected. Unplugging MAF sensor makes it run normally, tried a known good OEM MAF with no change. It would seem that it still has a bad MAF but a total of three new have been installed with zero change.
April 23, 2015
2005 Mercury Mountaineer 4.0L Misfire, MIL Lamp on VIN: 4M2ZU66E85
P0304: Cylinder 4 misfire detected. ... with a P0304(cylinder 4 misfire detected), p0316(engine misfire on start up). Originally came in about 2 weeks ago with these codes. spark plugs look new. Replaced coil pack and wires. Car runs great and smooth. Customer pi...
April 27, 2015
2002 Subaru Impreza WRX 2.0L Hesitation, Cuts out, Misfire VIN: JF1GD29672
P0304: Cylinder 4 Misfire Detected. Unplugging MAF sensor makes it run normally, tried a known good OEM MAF with no change. It would seem that it still has a bad MAF but a total of three new have been installed with zero change.
April 27, 2015
2009 Subaru Outback 3.0 R Limited 3.0L Misfire, MIL Lamp on VIN: 4S4BP85C29
P0304: Misfire Cylinder 4. Car came in with misfire codes only on bank 2, test drove, could not duplicate misfire, no other problems found, cleared codes, came back after a month or so with same codes, removed front plugs on both banks and they are almost new and the correct type, still...
April 27, 2015