Join Now
International Automotive Technicians Network

P0304 Diagnostic Trouble Code Discussion for March 2012

Cylinder 4 Misfire Detected

Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0304
Help Request Posted
2004 Ford F-150 FX4 5.4L Misfire VIN: 1FTPW14544
P0304: missfire cyl 4. vehicle was towed into shop for bad missfire checked and found random missfire codes on all cyclinders checked and found plugs still original removed and replaced all plugs with factory plugs and replaced all coils with factory coil as well. upon start up of v...
March 01, 2012
1997 Ford Explorer Sport 4.0L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1FMCU24X7V
P0304: 4 cylinder missfire. I've been fighting an engine miss for weeks on this vehilce with no results and unhappy customer. What am I missing. My vacumm has a slight flutter on idle, Valve giuld worn or what??? Have been reading about running compression test. Have not done this. Shoul...
March 04, 2012
2001 Ford Windstar SE 3.8L Misfire VIN: 2FMZA524X1
Hi i have a windstar with a very wierd issue, ok, veh runs perfect at idle, ingear under load, engine accels to 2500rpm, at this point it starts misfiring on cyl 4,5,6. Holding the brake and continuing to push down the accelerator veh actually looses power hor...
March 05, 2012
2003 Honda Pilot EX 3.5L MIL Lamp on VIN: 2HKYF18653
P0304: Cylinder 4 Misfire Detected. The mis fire code for cyld 3 is the one that returns first and most frequent. The code will set at idle in stall after five to ten minutes. The fuel pressure will hold for three minutes. Out on the highway vehicle runs very good. When the cat is cool the readi...
March 05, 2012
2000 Toyota Avalon XL 3.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 4T1BF28B3Y
P0304: Cylinder 4 Misfire Detected. We have this 2000 Avalon that runs rough at idle and is setting VVT-i sensor range and misfire codes for bank 2. Checked the timing belt alignment and it was perfect. We checked the oil screen and the oil switching solenoid that controls the VVT-i gear. They w...
March 07, 2012
2003 Chevrolet Malibu LS 3.1L Misfire VIN: 1G1NE52J73
P0304: cyl 4 miss. Well I have a fun one here. This 03 Malibu came to us with a dead #1 cyl. we found the exhaust valve rocker stud pulled up. After repairing that we now have misfires on #1 and 4 cyls. I have swapped coils, no change. Tried known good ICM, no change. Scoped cra...
March 08, 2012
2008 Chrysler PT Cruiser Limited 2.4L Misfire VIN: 3A8FY688X8
P0304: Cylinder 4 Misfire. Have This 2.4 Turbo PT here with a p0304, this code has been cleared couple times by other shops now it's here and needs to be fixed. Checked compression in cylinder 4 140psi and compared to cyl 1 close to the same. Inspected the plugs has autolights in it loo...
March 10, 2012
2007 Ford Focus SE 2.0L Misfire VIN: 1FAFP36NX7
P0304: Cylinder 4 misfire. Hey there everyone in Tech Land, This focus was unused for 5 days while parked at the airport . Customer returned and barely made it home. Under powered misfire etc. when the vehicle came to me misfires on all cylinders where stored where present. Voltage meas...
March 16, 2012
2007 GMC Yukon XL 1500 SLT 5.3L Misfire, MIL Lamp on VIN: 1GKSK163X7
P0304: Cylinder 4 Misfire Detected. i have known this vehicle since it was new fairly well maintained removed valve cover and the valves seem to be functioning properly
March 27, 2012
2002 Hyundai Accent GL 1.6L Surge, Misfire, MIL Lamp on VIN: KMHCG45C72
P0304: Cylinder 4 Misfire Detected. Vehicle came to shop with an intermitten misfire worst under load. We change ignition wires, spark plugs, swap injector #4 to #2 and coils and still misfire in cyl. #4 So we Did a valve job on cylinder head and still the same. I notice that when it runs good i...
March 31, 2012