Join Now
International Automotive Technicians Network

P0303 Diagnostic Trouble Code Discussion for January 2012

Cylinder 3 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 P0303
Help Request Posted
2005 Ford F-150 FX4 5.4L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1FTPX14565
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
1999 Subaru Legacy L 2.2L MIL Lamp on VIN: 4S3BD4357X
P0303: Cylinder 3 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
2002 Chevrolet Trailblazer LS 4.2L Poor Idle Quality, Misfire VIN: 1GNDT13S72
P0303: Cylinder 3 Misfire Detected. installed new plugs, coil boots and new coil on number 3. still can read missfire counters on scanner on cylinder 3. did find vacuum leak on intake and found it warped. Installed new intake and still have the small miss on 3. When I removed the new plug it loo...
January 09, 2012
2009 Nissan Murano LE 3.5L Misfire VIN: JN8AZ18WX9
P0303: . ... on this one. The car came in with a slight misfire @ idle only and no CEL and no codes. While I was looking at the missfire counter I noticed #3 has quite a few missfires and after it idled for a while it set a code for #3 missfire, p0303 I swapped #3 coil...
January 09, 2012
2003 Kia Sorento EX 3.5L Poor Idle Quality VIN: KNDJD73393
P0303: Cylinder 3 Misfire Detected. Looking at this Sorento for a used car lot. Their mechanic recently did the heads on this vehicle due to overheating.Cranks up and runs smooth as silk until it idles down and it develops a rough idle. Read other posts on these vehicles and it sure sounds like ...
January 14, 2012
2003 Volkswagen Passat GLS 1.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: WVWPD63B43
... 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
2004 Chevrolet Silverado 3500 6.6L Surge, Misfire
P0303: Cylinder 3 Misfire Detected. ... The engine will surge while cruising between 1600-2000RPM. It can occur very intermittently but with lower ambient temperatures lately (-30*C) it seems to be more noticeable. While the issue appears to be a surge it is actually more of a misfire. I would ...
January 20, 2012
2002 Dodge Ram 1500 Van 3.9L Misfire, MIL Lamp on VIN: 2B7HB11X02
P0303: Cylinder 3 Misfire Detected. i have a 2002 Dodge ram van b1500 with a 3.9L with P0300. it shows constant misfires in the datastream on only cylinder 3. it has new plugs, wires, cap, rotor and ignition coil. i switched injectors 3 and 5. the misfire did not move. compression is 125 psi. va...
January 26, 2012
2005 Ford F-150 FX4 5.4L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1FTPX14565
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
1999 Subaru Legacy L 2.2L MIL Lamp on VIN: 4S3BD4357X
P0303: Cylinder 3 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
2002 Chevrolet Trailblazer LS 4.2L Poor Idle Quality, Misfire VIN: 1GNDT13S72
P0303: Cylinder 3 Misfire Detected. installed new plugs, coil boots and new coil on number 3. still can read missfire counters on scanner on cylinder 3. did find vacuum leak on intake and found it warped. Installed new intake and still have the small miss on 3. When I removed the new plug it loo...
January 09, 2012
2009 Nissan Murano LE 3.5L Misfire VIN: JN8AZ18WX9
P0303: . ... on this one. The car came in with a slight misfire @ idle only and no CEL and no codes. While I was looking at the missfire counter I noticed #3 has quite a few missfires and after it idled for a while it set a code for #3 missfire, p0303 I swapped #3 coil...
January 09, 2012
2003 Kia Sorento EX 3.5L Poor Idle Quality VIN: KNDJD73393
P0303: Cylinder 3 Misfire Detected. Looking at this Sorento for a used car lot. Their mechanic recently did the heads on this vehicle due to overheating.Cranks up and runs smooth as silk until it idles down and it develops a rough idle. Read other posts on these vehicles and it sure sounds like ...
January 14, 2012
2003 Volkswagen Passat GLS 1.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: WVWPD63B43
... 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
2004 Chevrolet Silverado 3500 6.6L Surge, Misfire
P0303: Cylinder 3 Misfire Detected. ... The engine will surge while cruising between 1600-2000RPM. It can occur very intermittently but with lower ambient temperatures lately (-30*C) it seems to be more noticeable. While the issue appears to be a surge it is actually more of a misfire. I would ...
January 20, 2012
2002 Dodge Ram 1500 Van 3.9L Misfire, MIL Lamp on VIN: 2B7HB11X02
P0303: Cylinder 3 Misfire Detected. i have a 2002 Dodge ram van b1500 with a 3.9L with P0300. it shows constant misfires in the datastream on only cylinder 3. it has new plugs, wires, cap, rotor and ignition coil. i switched injectors 3 and 5. the misfire did not move. compression is 125 psi. va...
January 26, 2012