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P0303 Diagnostic Trouble Code Discussion for February 2014

Cylinder 3 Misfire Detected


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Trouble Ticket Help Requests for DTC P0303
Help Request Posted
1998 Honda Accord LX 3.0L Misfire, MIL Lamp on VIN: 1HGCG1625W
P0303: Cylinder 3 Misfire Detected. note the pressure readings are at altitude over 6000 feet. with ignition scope on while loaded and miss-firing there is turbulance and a shortened burn time. #3 cyl is consistant,#6 cyl is not so much. the intake is clean and the egr passage ok and the egr val...
February 03, 2014
2008 Audi A6 Quattro 3.2L Excessive Emissions, Poor Idle Quality, Misfire VIN: WAUDH74F78
We suspect the fuel injector is stuck open. Is there a way to check the electrical circuit firing the injector? There seems to be no way to access the connector. We have not taken one of these apart so perhaps there is a way to test the electrical when we have...
February 04, 2014
1998 Mercedes-Benz S320 SWB 3.2L Misfire VIN: WDBGA33G3W
P0303: Cylinder 3 misfire. This car idles fine but as soon as you accelerate at all the misfire counter on cylinder 3 and 4 exceeds the limit and turns off the injectors on those two cylinders. The misfire recognition on the SDS show zero on the other cylinders and #s 3 and 4 hang aroun...
February 07, 2014
2008 Chevrolet Equinox LT 3.4L Misfire, MIL Lamp on VIN: 2CNDC33F98
P0303: Cylinder 3 Misfire Detected. ... have a issue with a 2008 chevy equinox. vehile came in 2 months ago with only a p0303 misfire on cylinder 3. found a cracked spark plug long ways, we replaced all 6 plugs with ac plugs, car runs fine. 3 weeks later she came back...same thing misfire 3...cr...
February 17, 2014
2002 Honda Civic EX 1.7L Misfire
P0303: 3 cyl. misfire. To all Techs, This Honda Civic has an "intermittent" misfire that seems to occur when driving at highway speed. The "intermittent" misfire occurs when the VETC system is either ON or OFF. I even remove the EGR valve for testing but the misfire ...
February 18, 2014
2005 Audi S4 4.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: WAUXL68E85
P0303: misfire cyl 3. Hello all. This car was towed into us. P0346 code and all cylinders misfiring. did compression test and found the following results cyl 1 25 lbs cyl 5 60 lbs cyl 2 75 lbs cyl 6 75 lbs cyl 3 40 lbs cyl 7 70 lbs cyl 4 25 lbs cyl 8 85 lbs this is a 4.2 litre v8...
February 19, 2014
1999 Toyota Tacoma DLX 3.4L Misfire VIN: 4TAWN72N7X
P0303: Cylinder 3 Misfire Detected. Under load we have a misfire on cyl. 3 and 4 (codes:PO300, PO303, PO304). I have replaced the air filter, fuel filter, and MAF sensor. I have moved the coils and plugs on both cyl. with no change. I have cleaned the throttle body and checked for vacuum leaks a...
February 19, 2014
2003 Volkswagen Beetle GLS 2.0L MIL Lamp on VIN: 3VWCK21C03
P0303: misfire 3. Car came in from another shop misfire #3 and #4 cylinders. We check compression #1 & #2 100 psi, #3 & #4 150psi. Cylinder leakage test indicated head gasket leak 1 to 2 cylinder. Replaced head gasket. Compression now 150 psi all cylinders. Test driven ...
February 20, 2014
1998 Mercedes-Benz S320 SWB 3.2L Misfire VIN: WDBGA33G3W
P0303: Cylinder 3 misfire. This car idles fine but as soon as you accelerate at all the misfire counter on cylinder 3 and 4 exceeds the limit and turns off the injectors on those two cylinders. The misfire recognition on the SDS show zero on the other cylinders and #s 3 and 4 hang aroun...
February 07, 2014
2008 Chevrolet Equinox LT 3.4L Misfire, MIL Lamp on VIN: 2CNDC33F98
P0303: Cylinder 3 Misfire Detected. ... have a issue with a 2008 chevy equinox. vehile came in 2 months ago with only a p0303 misfire on cylinder 3. found a cracked spark plug long ways, we replaced all 6 plugs with ac plugs, car runs fine. 3 weeks later she came back...same thing misfire 3...cr...
February 17, 2014
2002 Honda Civic EX 1.7L Misfire
P0303: 3 cyl. misfire. To all Techs, This Honda Civic has an "intermittent" misfire that seems to occur when driving at highway speed. The "intermittent" misfire occurs when the VETC system is either ON or OFF. I even remove the EGR valve for testing but the misfire ...
February 18, 2014
2005 Audi S4 4.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: WAUXL68E85
P0303: misfire cyl 3. Hello all. This car was towed into us. P0346 code and all cylinders misfiring. did compression test and found the following results cyl 1 25 lbs cyl 5 60 lbs cyl 2 75 lbs cyl 6 75 lbs cyl 3 40 lbs cyl 7 70 lbs cyl 4 25 lbs cyl 8 85 lbs this is a 4.2 litre v8...
February 19, 2014
1999 Toyota Tacoma DLX 3.4L Misfire VIN: 4TAWN72N7X
P0303: Cylinder 3 Misfire Detected. Under load we have a misfire on cyl. 3 and 4 (codes:PO300, PO303, PO304). I have replaced the air filter, fuel filter, and MAF sensor. I have moved the coils and plugs on both cyl. with no change. I have cleaned the throttle body and checked for vacuum leaks a...
February 19, 2014
2003 Volkswagen Beetle GLS 2.0L MIL Lamp on VIN: 3VWCK21C03
P0303: misfire 3. Car came in from another shop misfire #3 and #4 cylinders. We check compression #1 & #2 100 psi, #3 & #4 150psi. Cylinder leakage test indicated head gasket leak 1 to 2 cylinder. Replaced head gasket. Compression now 150 psi all cylinders. Test driven ...
February 20, 2014
1998 Mercedes-Benz S320 SWB 3.2L Misfire VIN: WDBGA33G3W
P0303: Cylinder 3 misfire. This car idles fine but as soon as you accelerate at all the misfire counter on cylinder 3 and 4 exceeds the limit and turns off the injectors on those two cylinders. The misfire recognition on the SDS show zero on the other cylinders and #s 3 and 4 hang aroun...
February 07, 2014
2008 Chevrolet Equinox LT 3.4L Misfire, MIL Lamp on VIN: 2CNDC33F98
P0303: Cylinder 3 Misfire Detected. ... have a issue with a 2008 chevy equinox. vehile came in 2 months ago with only a p0303 misfire on cylinder 3. found a cracked spark plug long ways, we replaced all 6 plugs with ac plugs, car runs fine. 3 weeks later she came back...same thing misfire 3...cr...
February 17, 2014
2002 Honda Civic EX 1.7L Misfire
P0303: 3 cyl. misfire. To all Techs, This Honda Civic has an "intermittent" misfire that seems to occur when driving at highway speed. The "intermittent" misfire occurs when the VETC system is either ON or OFF. I even remove the EGR valve for testing but the misfire ...
February 18, 2014
2005 Audi S4 4.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: WAUXL68E85
P0303: misfire cyl 3. Hello all. This car was towed into us. P0346 code and all cylinders misfiring. did compression test and found the following results cyl 1 25 lbs cyl 5 60 lbs cyl 2 75 lbs cyl 6 75 lbs cyl 3 40 lbs cyl 7 70 lbs cyl 4 25 lbs cyl 8 85 lbs this is a 4.2 litre v8...
February 19, 2014
1999 Toyota Tacoma DLX 3.4L Misfire VIN: 4TAWN72N7X
P0303: Cylinder 3 Misfire Detected. Under load we have a misfire on cyl. 3 and 4 (codes:PO300, PO303, PO304). I have replaced the air filter, fuel filter, and MAF sensor. I have moved the coils and plugs on both cyl. with no change. I have cleaned the throttle body and checked for vacuum leaks a...
February 19, 2014
2003 Volkswagen Beetle GLS 2.0L MIL Lamp on VIN: 3VWCK21C03
P0303: misfire 3. Car came in from another shop misfire #3 and #4 cylinders. We check compression #1 & #2 100 psi, #3 & #4 150psi. Cylinder leakage test indicated head gasket leak 1 to 2 cylinder. Replaced head gasket. Compression now 150 psi all cylinders. Test driven ...
February 20, 2014
1998 Honda Accord LX 3.0L Misfire, MIL Lamp on VIN: 1HGCG1625W
P0303: Cylinder 3 Misfire Detected. note the pressure readings are at altitude over 6000 feet. with ignition scope on while loaded and miss-firing there is turbulance and a shortened burn time. #3 cyl is consistant,#6 cyl is not so much. the intake is clean and the egr passage ok and the egr val...
February 03, 2014
2008 Audi A6 Quattro 3.2L Excessive Emissions, Poor Idle Quality, Misfire VIN: WAUDH74F78
We suspect the fuel injector is stuck open. Is there a way to check the electrical circuit firing the injector? There seems to be no way to access the connector. We have not taken one of these apart so perhaps there is a way to test the electrical when we have...
February 04, 2014
1998 Mercedes-Benz S320 SWB 3.2L Misfire VIN: WDBGA33G3W
P0303: Cylinder 3 misfire. This car idles fine but as soon as you accelerate at all the misfire counter on cylinder 3 and 4 exceeds the limit and turns off the injectors on those two cylinders. The misfire recognition on the SDS show zero on the other cylinders and #s 3 and 4 hang aroun...
February 07, 2014
2008 Chevrolet Equinox LT 3.4L Misfire, MIL Lamp on VIN: 2CNDC33F98
P0303: Cylinder 3 Misfire Detected. ... have a issue with a 2008 chevy equinox. vehile came in 2 months ago with only a p0303 misfire on cylinder 3. found a cracked spark plug long ways, we replaced all 6 plugs with ac plugs, car runs fine. 3 weeks later she came back...same thing misfire 3...cr...
February 17, 2014
2002 Honda Civic EX 1.7L Misfire
P0303: 3 cyl. misfire. To all Techs, This Honda Civic has an "intermittent" misfire that seems to occur when driving at highway speed. The "intermittent" misfire occurs when the VETC system is either ON or OFF. I even remove the EGR valve for testing but the misfire ...
February 18, 2014
2005 Audi S4 4.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: WAUXL68E85
P0303: misfire cyl 3. Hello all. This car was towed into us. P0346 code and all cylinders misfiring. did compression test and found the following results cyl 1 25 lbs cyl 5 60 lbs cyl 2 75 lbs cyl 6 75 lbs cyl 3 40 lbs cyl 7 70 lbs cyl 4 25 lbs cyl 8 85 lbs this is a 4.2 litre v8...
February 19, 2014
1999 Toyota Tacoma DLX 3.4L Misfire VIN: 4TAWN72N7X
P0303: Cylinder 3 Misfire Detected. Under load we have a misfire on cyl. 3 and 4 (codes:PO300, PO303, PO304). I have replaced the air filter, fuel filter, and MAF sensor. I have moved the coils and plugs on both cyl. with no change. I have cleaned the throttle body and checked for vacuum leaks a...
February 19, 2014
2003 Volkswagen Beetle GLS 2.0L MIL Lamp on VIN: 3VWCK21C03
P0303: misfire 3. Car came in from another shop misfire #3 and #4 cylinders. We check compression #1 & #2 100 psi, #3 & #4 150psi. Cylinder leakage test indicated head gasket leak 1 to 2 cylinder. Replaced head gasket. Compression now 150 psi all cylinders. Test driven ...
February 20, 2014
1998 Honda Accord LX 3.0L Misfire, MIL Lamp on VIN: 1HGCG1625W
P0303: Cylinder 3 Misfire Detected. note the pressure readings are at altitude over 6000 feet. with ignition scope on while loaded and miss-firing there is turbulance and a shortened burn time. #3 cyl is consistant,#6 cyl is not so much. the intake is clean and the egr passage ok and the egr val...
February 03, 2014
2008 Audi A6 Quattro 3.2L Excessive Emissions, Poor Idle Quality, Misfire VIN: WAUDH74F78
We suspect the fuel injector is stuck open. Is there a way to check the electrical circuit firing the injector? There seems to be no way to access the connector. We have not taken one of these apart so perhaps there is a way to test the electrical when we have...
February 04, 2014
1998 Mercedes-Benz S320 SWB 3.2L Misfire VIN: WDBGA33G3W
P0303: Cylinder 3 misfire. This car idles fine but as soon as you accelerate at all the misfire counter on cylinder 3 and 4 exceeds the limit and turns off the injectors on those two cylinders. The misfire recognition on the SDS show zero on the other cylinders and #s 3 and 4 hang aroun...
February 07, 2014
2008 Chevrolet Equinox LT 3.4L Misfire, MIL Lamp on VIN: 2CNDC33F98
P0303: Cylinder 3 Misfire Detected. ... have a issue with a 2008 chevy equinox. vehile came in 2 months ago with only a p0303 misfire on cylinder 3. found a cracked spark plug long ways, we replaced all 6 plugs with ac plugs, car runs fine. 3 weeks later she came back...same thing misfire 3...cr...
February 17, 2014
2002 Honda Civic EX 1.7L Misfire
P0303: 3 cyl. misfire. To all Techs, This Honda Civic has an "intermittent" misfire that seems to occur when driving at highway speed. The "intermittent" misfire occurs when the VETC system is either ON or OFF. I even remove the EGR valve for testing but the misfire ...
February 18, 2014
2005 Audi S4 4.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: WAUXL68E85
P0303: misfire cyl 3. Hello all. This car was towed into us. P0346 code and all cylinders misfiring. did compression test and found the following results cyl 1 25 lbs cyl 5 60 lbs cyl 2 75 lbs cyl 6 75 lbs cyl 3 40 lbs cyl 7 70 lbs cyl 4 25 lbs cyl 8 85 lbs this is a 4.2 litre v8...
February 19, 2014
1999 Toyota Tacoma DLX 3.4L Misfire VIN: 4TAWN72N7X
P0303: Cylinder 3 Misfire Detected. Under load we have a misfire on cyl. 3 and 4 (codes:PO300, PO303, PO304). I have replaced the air filter, fuel filter, and MAF sensor. I have moved the coils and plugs on both cyl. with no change. I have cleaned the throttle body and checked for vacuum leaks a...
February 19, 2014
2003 Volkswagen Beetle GLS 2.0L MIL Lamp on VIN: 3VWCK21C03
P0303: misfire 3. Car came in from another shop misfire #3 and #4 cylinders. We check compression #1 & #2 100 psi, #3 & #4 150psi. Cylinder leakage test indicated head gasket leak 1 to 2 cylinder. Replaced head gasket. Compression now 150 psi all cylinders. Test driven ...
February 20, 2014