Join Now
International Automotive Technicians Network

P0304 Diagnostic Trouble Code Discussion for August 2010

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
2005 Porsche Cayenne 3.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: WP1AA29P15
P0304: Cylinder 4 misfire detected. ... intake. Pulled codes p0300 and p0304. I switched coils 3 and 4 and the problem still stayed on 4. I did a compression test 1-200,2-195,3-200,4-95,5-195,6-160. I sprayed some oil into # 4 spark plug hole and comp. went up ...
August 02, 2010
1999 Dodge Neon High Line 2.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1B3ES47Y2X
P0304: Cylinder 4 Misfire Detected. ... for the help. I have a 1999 neon that came in from another shop. vehicle Intermittently has misfire symptoms. I have been unable to reproduce the problem. however, if I look under the misfire counters i get some really odd data. the counters flash from 800...
August 05, 2010
2003 Ford Escape XLT 3.0L Misfire, MIL Lamp on VIN: 1FMYU93173
P0304: Misfire. My tech replaced valve cover gaskets and spark plugs. Now we have a misfire code on cylinder four. The exhaust is getting very hot. What could have been done wrong or not done. The old intake gaskets were reused if this matters. We swapped plugs and ignition c...
August 10, 2010
1997 Honda Accord EX-R 2.2L Misfire, MIL Lamp on VIN: 1HGCD566XV
P0304: Cylinder 4 Misfire Detected. ... me that done alot of work to this car. After about 50 or 60 km, the check engine light would come on and then start to flash. I took the car for a road test, after clearing the codes, and drove about 15 km and the check engine light came back on. The code ...
August 18, 2010
2000 Toyota 4Runner Limited 3.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: JT3GN87R0Y
P0304: Cylinder 4 Misfire Detected. Truck came in w/p0300 p0303 p0304. Truck had 2 different types of spark plugs. Changed spark plugs & wires. Cleared codes & drove the truck. When cold, truck run perfect. After it warmed up p0304 came back. It seems to run better at high rpm. #4 inject...
August 18, 2010
2005 Subaru Forester XT 2.5L Poor Idle Quality VIN: JF1SG69665
P0304: Cylinder 4 Misfire Detected. thank for any help to offer I have an 05 subaru forester 2.5 dohc turbo setting misire #4 po3o4 have replaced the plugs because they were worn switched the fuel injector and misfire still on #4 misfire counter rarely picks it up but is still counting on #4 cyl...
August 26, 2010
2004 Kia Rio 1.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: KNADC12544
P0304: Cylinder 4 Misfire Detected. We got this rio from another shop that has replaced complete secondary and still having problems. we originally had some trouble getting it to act up. Vehicle will sit over night we let it run for 30 min and will get codes and engine runs terrible. the previou...
August 27, 2010
2001 Chevrolet S10 4.3L MIL Lamp on VIN: 1GNCS13W91
P0304: Cylinder 4 Misfire Detected. ... with code p0304, clear code and goes to p0300. Computer scan data shows hard misfire cylinder #4. Vehicle exhibits no symptoms and is hitting on all cylinders. MIL is flashing. Code is false, no misfire is occuring. What can cause computer to think #4 is...
August 30, 2010
2001 Chevrolet S10 4.3L MIL Lamp on VIN: 1GNCS13W91
P0304: Cylinder 4 Misfire Detected. ... with code p0304, clear code and goes to p0300. Computer scan data shows hard misfire cylinder #4. Vehicle exhibits no symptoms and is hitting on all cylinders. MIL is flashing. Code is false, no misfire is occuring. What can cause computer to think #4 is...
August 31, 2010
2005 Porsche Cayenne 3.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: WP1AA29P15
P0304: Cylinder 4 misfire detected. ... intake. Pulled codes p0300 and p0304. I switched coils 3 and 4 and the problem still stayed on 4. I did a compression test 1-200,2-195,3-200,4-95,5-195,6-160. I sprayed some oil into # 4 spark plug hole and comp. went up ...
August 02, 2010
1999 Dodge Neon High Line 2.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1B3ES47Y2X
P0304: Cylinder 4 Misfire Detected. ... for the help. I have a 1999 neon that came in from another shop. vehicle Intermittently has misfire symptoms. I have been unable to reproduce the problem. however, if I look under the misfire counters i get some really odd data. the counters flash from 800...
August 05, 2010
2003 Ford Escape XLT 3.0L Misfire, MIL Lamp on VIN: 1FMYU93173
P0304: Misfire. My tech replaced valve cover gaskets and spark plugs. Now we have a misfire code on cylinder four. The exhaust is getting very hot. What could have been done wrong or not done. The old intake gaskets were reused if this matters. We swapped plugs and ignition c...
August 10, 2010
1997 Honda Accord EX-R 2.2L Misfire, MIL Lamp on VIN: 1HGCD566XV
P0304: Cylinder 4 Misfire Detected. ... me that done alot of work to this car. After about 50 or 60 km, the check engine light would come on and then start to flash. I took the car for a road test, after clearing the codes, and drove about 15 km and the check engine light came back on. The code ...
August 18, 2010
2000 Toyota 4Runner Limited 3.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: JT3GN87R0Y
P0304: Cylinder 4 Misfire Detected. Truck came in w/p0300 p0303 p0304. Truck had 2 different types of spark plugs. Changed spark plugs & wires. Cleared codes & drove the truck. When cold, truck run perfect. After it warmed up p0304 came back. It seems to run better at high rpm. #4 inject...
August 18, 2010
2005 Subaru Forester XT 2.5L Poor Idle Quality VIN: JF1SG69665
P0304: Cylinder 4 Misfire Detected. thank for any help to offer I have an 05 subaru forester 2.5 dohc turbo setting misire #4 po3o4 have replaced the plugs because they were worn switched the fuel injector and misfire still on #4 misfire counter rarely picks it up but is still counting on #4 cyl...
August 26, 2010
2004 Kia Rio 1.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: KNADC12544
P0304: Cylinder 4 Misfire Detected. We got this rio from another shop that has replaced complete secondary and still having problems. we originally had some trouble getting it to act up. Vehicle will sit over night we let it run for 30 min and will get codes and engine runs terrible. the previou...
August 27, 2010
2001 Chevrolet S10 4.3L MIL Lamp on VIN: 1GNCS13W91
P0304: Cylinder 4 Misfire Detected. ... with code p0304, clear code and goes to p0300. Computer scan data shows hard misfire cylinder #4. Vehicle exhibits no symptoms and is hitting on all cylinders. MIL is flashing. Code is false, no misfire is occuring. What can cause computer to think #4 is...
August 30, 2010
2001 Chevrolet S10 4.3L MIL Lamp on VIN: 1GNCS13W91
P0304: Cylinder 4 Misfire Detected. ... with code p0304, clear code and goes to p0300. Computer scan data shows hard misfire cylinder #4. Vehicle exhibits no symptoms and is hitting on all cylinders. MIL is flashing. Code is false, no misfire is occuring. What can cause computer to think #4 is...
August 31, 2010