Join Now
International Automotive Technicians Network

P0303 Diagnostic Trouble Code Discussion for November 2009

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
2003 Land Rover Discovery HSE 4.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: SALTY16443
please help. we have replaced camshaft,lifters,timing chain and spark plugs. we have good spark,fuel and valves seem to no be sticking,good compression and does not drop. what would be your next step? fuel trim all reads negative by the scan tool.
November 03, 2009
1999 Mercury Cougar V6 2.5L No Start VIN: 1ZWFT61LXX
P0303: misfire. Cra was towed in for cranks, no start. Customer states was running rough prior to not starting.
November 03, 2009
2002 Volkswagen Passat W8 4.0L Excessive Emissions, Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on VIN: WVWUK63B82
P0303: Cylinder 3 Misfire. Hi Group I suspect the problem with this car is a timing chain has jumped a few teeth. I use Alldata and it does not cover this engine very well. This is a 8 cylinder engine and I don't understand why I don't have 4 misfire codes, if 1 cam is out It should af...
November 03, 2009
1999 Ford Explorer XLT 4.0L Misfire, MIL Lamp on VIN: 1FMZU34E8X
P0303: cyl 3 miss. Misses bad on cylinders 1-2-3, so far I have switched up and down stream O/2 Sensors and that didnt change a thing. I checked for vaccum leaks around intake and doesnt seem to be any, Some things I have noticed is a wierd almost "chirping" sound in the...
November 04, 2009
2003 Land Rover Discovery HSE 4.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: SALTY16443
please help. we have replaced camshaft,lifters,timing chain and spark plugs. we have good spark,fuel and valves seem to no be sticking,good compression and does not drop. what would be your next step? fuel trim all reads negative by the scan tool.
November 05, 2009
2000 Volkswagen Jetta GL 2.0L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 3VWSC29M2Y
P0303: Cyl3 Misfire. Howdy Techs, here is a weird German VW problem, When cylinder # 4 was misfiring, fuel pump relay would click rapidly causing multiple misfires. Pin testing relay socket no problems found. Has anyone come across this ? Want to ship the vehicle out. Have driven ...
November 05, 2009
2000 Volkswagen Jetta GL 2.0L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 3VWSC29M2Y
P0303: Cyl3 Misfire. Howdy Techs, here is a weird German VW problem, When cylinder # 4 was misfiring, fuel pump relay would click rapidly causing multiple misfires. Pin testing relay socket no problems found. Has anyone come across this ? Want to ship the vehicle out. Have driven ...
November 06, 2009
1997 Pontiac Grand Prix GTP 3.8L Cuts out, Misfire, Poor Fuel Economy VIN: 1G2WP1213V
P0303: Cylinder 3 missfire. Customer purchased the car in 2003, and was garaged in 2006. The car sat garaged for 3 years before being put back on the road earlier this year. The problem that this car has is that when you step on the accelerator and the boost builds up, cylinders 1,3,5 mi...
November 09, 2009
2005 Subaru Legacy GT Limited 2.5L Poor Idle Quality, Misfire, MIL Lamp on VIN: 4S3BL67635
P0303: Cylinder 3 Misfire Detected. customer came in first with a cyl # 3 missfire, codes were just erased by someone else - so monitors had not ran completely. i requested that the customer return when all monitors had ran. customer put new plugs, switched coils around. no difference car runs w...
November 19, 2009
2000 Honda Accord LX 3.0L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1HGCG165XY
P0303: Cylinder 3 Misfire Detected. HELP! This vehicle driving me nuts.The customer came in complaining of runs rough after hotsoak.It seemed the problem was fuel related.Went through fix database and read about Honda tsb about replace the fuel pressure regulator and pcm.I can make it do it ever...
November 23, 2009
2003 Land Rover Discovery HSE 4.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: SALTY16443
please help. we have replaced camshaft,lifters,timing chain and spark plugs. we have good spark,fuel and valves seem to no be sticking,good compression and does not drop. what would be your next step? fuel trim all reads negative by the scan tool.
November 03, 2009
1999 Mercury Cougar V6 2.5L No Start VIN: 1ZWFT61LXX
P0303: misfire. Cra was towed in for cranks, no start. Customer states was running rough prior to not starting.
November 03, 2009
2002 Volkswagen Passat W8 4.0L Excessive Emissions, Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on VIN: WVWUK63B82
P0303: Cylinder 3 Misfire. Hi Group I suspect the problem with this car is a timing chain has jumped a few teeth. I use Alldata and it does not cover this engine very well. This is a 8 cylinder engine and I don't understand why I don't have 4 misfire codes, if 1 cam is out It should af...
November 03, 2009
1999 Ford Explorer XLT 4.0L Misfire, MIL Lamp on VIN: 1FMZU34E8X
P0303: cyl 3 miss. Misses bad on cylinders 1-2-3, so far I have switched up and down stream O/2 Sensors and that didnt change a thing. I checked for vaccum leaks around intake and doesnt seem to be any, Some things I have noticed is a wierd almost "chirping" sound in the...
November 04, 2009
2003 Land Rover Discovery HSE 4.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: SALTY16443
please help. we have replaced camshaft,lifters,timing chain and spark plugs. we have good spark,fuel and valves seem to no be sticking,good compression and does not drop. what would be your next step? fuel trim all reads negative by the scan tool.
November 05, 2009
2000 Volkswagen Jetta GL 2.0L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 3VWSC29M2Y
P0303: Cyl3 Misfire. Howdy Techs, here is a weird German VW problem, When cylinder # 4 was misfiring, fuel pump relay would click rapidly causing multiple misfires. Pin testing relay socket no problems found. Has anyone come across this ? Want to ship the vehicle out. Have driven ...
November 05, 2009
2000 Volkswagen Jetta GL 2.0L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 3VWSC29M2Y
P0303: Cyl3 Misfire. Howdy Techs, here is a weird German VW problem, When cylinder # 4 was misfiring, fuel pump relay would click rapidly causing multiple misfires. Pin testing relay socket no problems found. Has anyone come across this ? Want to ship the vehicle out. Have driven ...
November 06, 2009
1997 Pontiac Grand Prix GTP 3.8L Cuts out, Misfire, Poor Fuel Economy VIN: 1G2WP1213V
P0303: Cylinder 3 missfire. Customer purchased the car in 2003, and was garaged in 2006. The car sat garaged for 3 years before being put back on the road earlier this year. The problem that this car has is that when you step on the accelerator and the boost builds up, cylinders 1,3,5 mi...
November 09, 2009
2005 Subaru Legacy GT Limited 2.5L Poor Idle Quality, Misfire, MIL Lamp on VIN: 4S3BL67635
P0303: Cylinder 3 Misfire Detected. customer came in first with a cyl # 3 missfire, codes were just erased by someone else - so monitors had not ran completely. i requested that the customer return when all monitors had ran. customer put new plugs, switched coils around. no difference car runs w...
November 19, 2009
2000 Honda Accord LX 3.0L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1HGCG165XY
P0303: Cylinder 3 Misfire Detected. HELP! This vehicle driving me nuts.The customer came in complaining of runs rough after hotsoak.It seemed the problem was fuel related.Went through fix database and read about Honda tsb about replace the fuel pressure regulator and pcm.I can make it do it ever...
November 23, 2009