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P0304 Diagnostic Trouble Code Discussion for April 2010

Cylinder 4 Misfire Detected


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Trouble Ticket Help Requests for DTC P0304
Help Request Posted
1996 Porsche 911 Carrera 3.6L Misfire, MIL Lamp on VIN: WPOAA2997T
P0304: misfire cly 4. This car sets misfire codes repeatedly. always occurs at about 50-60 mph, 4th gear, light throttle(5-7%), 3200-3400 RPM,fuel trims near zero. The car had 30K service. We have changed plugs, plug wires, caps, rotors, coils and checked distributor belt, Cylinder...
April 01, 2010
2000 Mercedes-Benz CL500 5.0L Misfire VIN: WDB2153752
P0304: ignition missfire cyl 4. G,day everyone, we have a lovely cl500 in our workshop which we require help with. Anything over half throttle engine missfires and will not rev over 3000rpm. We have downloaded fault codes which indicate cyls 1,2,3,4 (right bank) missfiring. We have replaced ...
April 06, 2010
2006 Audi A4 2.0L Misfire VIN: WAUAF78E86
P0304: 4 cylinder misfire. This car has a a misfire on #4 cylinder but only after a 10 - 15 min hot soak. The dealer has installed a ECU due to no injector pulse on 2 injectors, the customer only drove car about 1 week and had misfire at times- so dealer removed intake manifold and clea...
April 07, 2010
2001 Volkswagen Passat GLX 2.8L Misfire, MIL Lamp on VIN: WVWRH53B91
P0304: c4mis. hello all . this vehichle came in with all of these misfire codes . o.e. plugs/wires at 113000. replaced plugs wires , cmp sensor . started engine , c4mis code . swapped wires, plugs , injectors . still c4mis . good compression on all . checked timing belt mar...
April 07, 2010
2006 Audi A4 2.0L Misfire VIN: WAUAF78E86
P0304: 4 cylinder misfire. This car has a a misfire on #4 cylinder but only after a 10 - 15 min hot soak. The dealer has installed a ECU due to no injector pulse on 2 injectors, the customer only drove car about 1 week and had misfire at times- so dealer removed intake manifold and clea...
April 08, 2010
2003 Ford F-150 XL 4.6L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 1FTRX17W83
P0304: misfire cylinder 4. ... with a truck here in my shop. Truck came in with a misfire on Cyl# 1-4, also had a P0354. all plugs were changed, along with both coils on 1-4. Misfire was still present. Pulled plugs 1-4 and found them to be gas soaked, ne...
April 08, 2010
2001 Volvo S40 1.9L Misfire, MIL Lamp on VIN: YV1VS29501
P0304: cylinder 4 misfire. Customer complains that maybe once a week on a start up the engine misfires for a short time...maybe 30 seconds. Always cylinder 1 and 4. It will go days before it acts up again. We did have the cam sensor off for the cam gear replacement.The plugs were replac...
April 08, 2010
2006 Subaru Legacy 2.5i 2.5L Misfire, MIL Lamp on VIN: 4S3BL67666
P0304: Cylinder 4 Misfire Detected. CAR HAS MISFIRE CYLINDER #4 SOMETIMES VERY BAD LIKE DEAD HOLE, AND SOME TIMES HARD TO NOTICE, TRIPS CHECK ENGIEN LIGHT. WE HAVE SWAPED IGNIITON COILS, SPARK PLUGS, FUEL INJECTORS MISS STAYS AT CYL. #4. PERFORM COMPRESSION TEST FOUND CYLINDER #4 AT 135psi. AND ...
April 09, 2010
2006 Subaru Legacy 2.5i 2.5L Misfire, MIL Lamp on VIN: 4S3BL67666
P0304: Cylinder 4 Misfire Detected. CAR HAS MISFIRE CYLINDER #4 SOMETIMES VERY BAD LIKE DEAD HOLE, AND SOME TIMES HARD TO NOTICE, TRIPS CHECK ENGIEN LIGHT. WE HAVE SWAPED IGNIITON COILS, SPARK PLUGS, FUEL INJECTORS MISS STAYS AT CYL. #4. PERFORM COMPRESSION TEST FOUND CYLINDER #4 AT 135psi. AND ...
April 10, 2010
2003 Jaguar S-Type 4.2L MIL Lamp on VIN: SAJEA01U43
P0304: . Hello all. This s-type has misfire faults for all cylinders except 7 & 8 and the map sensor circuit fault. Has anyone seen this on one of these normally aspirated 4.2's ? would just throw a MAP sensor on it and see, but it is an ugly job and the customer i...
April 13, 2010
2001 Porsche 911 Carrera 3.4L Misfire, Vibration VIN: WPOCA29941
P0304: cylinder 4 missfire detected. car starts and idles smoothly. runs fine to just above 3000 rpm, then vibrates, makes strange sounds out exhaust and looses power till below 3000 rpm. then smooth running. sometimes it will continue to miss on one or two clyinders untill switched off and resta...
April 19, 2010
2003 Volkswagen Passat GLS 1.8L Poor Idle Quality, MIL Lamp on VIN: WVWVD63B83
repaired several vacuum leaks, replaced 3 coils and all spark plugs, customer always runs 87 octane when premium is called for we alwayws fill with premium and it ran well. now the rough idle will not go away in closed loop. runs well down the road with plenty...
April 19, 2010
1999 Lexus RX300 3.0L Excessive Emissions, Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: JT6HF10V4X
P0304: cylinder four miss fires. We had customer drop off there new vehical here with ses light on . We checked codes and found tons of codes from miss fire to vvt codes. We cleared them and they came back after a short test drive. We notice car ran rough from time to time. We have concluded ...
April 20, 2010
2004 Volkswagen Jetta GL 2.0L Misfire, MIL Lamp on VIN: 3VWSK69M84
P0304: Cylinder 4 misfire. I need some info on how this system works.Car will misfire on cylinder #4 usually on a cold start or shortly there after-will continue to miss until engine is shut off and then restarted.When we check for the miss when it is happening we have no injector pulse...
April 20, 2010
1998 Ford Explorer XLT 4.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FMZU34E5W
P0304: Misfire 4. Here we are with this Explorer, was in other shop with the same codes, they replaced the coil and performed a full tune up, nothing changed. I did a leak down test to make sure the head gasket is ok since i see in the scanner misfire at cylinder #4 the most th...
April 21, 2010
2000 Volkswagen Passat GLS 1.8L Misfire, MIL Lamp on VIN: WVWNA23BXY
P0304: Cyl 4 Misfire. Ever get that car that just won't go away? You know the one that came in looking like you'd FINALLY make a couple dollars on and it ends up COSTING you about $3,700.99??? This is it: 2000 VW Passat. We put a timing belt and water pump (had to remove the ENTIRE...
April 21, 2010
1998 Ford Explorer XLT 4.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FMZU34E5W
P0304: Misfire 4. Here we are with this Explorer, was in other shop with the same codes, they replaced the coil and performed a full tune up, nothing changed. I did a leak down test to make sure the head gasket is ok since i see in the scanner misfire at cylinder #4 the most th...
April 22, 2010
2000 Toyota Tundra 3.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 5TBJN3217Y
P0304: Cylinder 4 Misfire Detected. Trk came back this am with misfires in all cyl.@ idle or on decel in park and sitting in shop.drivaibility is fine on streets or freeway.
April 29, 2010