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P0304 Diagnostic Trouble Code Discussion for May 2011

Cylinder 4 Misfire Detected

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Trouble Ticket Help Requests for DTC P0304
Help Request Posted
2002 Volkswagen Passat GLS 1.8L Stall, Misfire, cold start
P0304: miss4. Hi there I have got an 02 passat that has a cold start misfire stall we have checked for vac leaks (smoke tested), check fuel pressure (50-52 psi), replaced coils with the lateset OE parts the MAF has been changed 2 times (jobber and then OE part) T/body has b...
May 01, 2011
2000 Lincoln LS 3.9L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 1LNHM87A4Y
P0304: cylinder 4 misfire. Vehicle came into shop with misfire codes and lean bank 1 and rich bank two. Performed tune up to include cops on affected cylinders. Good fuel pressure. Has injector pulse. On bank 1 none of the plugs are firing on the whole bank. Still has code for number fo...
May 11, 2011
1998 Audi A6 Quattro 2.8L Poor Idle Quality, Misfire VIN: WAUBA24B4W
P0304: 4 misfire. Car came with intermitant misfire seems worse cold but will act up hot also. Swapped good coil from another car and problem seamed good put old coil back in to verify and #4 misfire came back right away. Put new coil in drove car and all was fine . Customer pi...
May 16, 2011
2001 Pontiac Aztek 3.4L Misfire VIN: 3G7DA03E11
P0304: Cylinder 4 Misfire Detected. I have a 5th cylinder misfire at idle, and none of the obvious causes seem to be the culprits. I get it above 1500rm and it runs perfect. I'm hoping some of you guys maybe have had experience with these 3400 Aztec motors and can give me an idea or two. I reall...
May 16, 2011
2004 Dodge Grand Caravan SE 3.3L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 2D4GP44L04
P0304: Cylinder 4 Misfire Detected. This van was brought to me after another shop determined low compression on cylinder #4 due to carbon build up. They installed new valves and checked the cylinder head over. Also installed new gaskets, plugs, ignition coil, and wires. They say the misfire was ...
May 17, 2011
2005 Kia Sedona LX 3.5L MIL Lamp on VIN: KNDUP13265
P0304: Cylinder 4 Misfire Detected. ... of power. MIL was on, had Upstream O2 sensor code. Road test, un able to duplicate, replaced o2. Car came back 1 month ago. Same complaint. Lack of power. MIL on agian, This time TPS code. Replaced TPS. Road tested. No problems felt. Car is back again. S...
May 17, 2011
2001 Volkswagen Passat GLS 1.8L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: WVWPD63B01
P0304: no 4 cylinder misfire. i need some help from vw techs please and thanks i have this passat is running rough and showing misfire all 4 cylinder it only happens when its cold and first start up it run rough about 1 minute or maybe little more and goes away after that car runs fine no ...
May 18, 2011
1998 Ford Expedition Eddie Bauer 5.4L Misfire VIN: 1FMPU18L6W
P0304: 4 cylinder misfire. truck came running rough at idle and missing when driving,missing bad when it shifted into overdrive at low speeds.I found the pcv vacume manifold elbows were bad and replaced which fixed the rough idle,but still had the miss under load.I tried mode 6 test 51 ...
May 19, 2011
1999 Ford Ranger XLT 3.0L Poor Idle Quality, MIL Lamp on VIN: 1FTZR15VXX
P0304: CYL 4 misfire. Have a reocuring cyl 4 misfire code. Problem started when ignition coil went bad. Did not perform origional repair but coil was changed with aftermarket and new plugs installed. After a week or so PO304 code. #4 cylinder was def. lean. Found two seals on the p...
May 24, 2011
2000 Lincoln LS 3.9L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1LNHM87A6Y
P0304: Cylinder 4 misfire detected. Suspect I have a valve train/timing chain problem and customer wants to repair vehicle. Would like a little input prior to tearing into the engine -- major labor involved. Vehicle has poor idle due to misfire but drives well. This is the first 3.9L we've worke...
May 24, 2011
2001 Honda Odyssey LX 3.5L Misfire VIN: 2HKRL18671
P0304: Cylinder 4 Misfire Detected. Depsite visual, fuel and vacuum checks the engine continues to run with a misfire. It is important to note that prior to the oil pressure switch change the problem did not exist. After the repair, the misfire developed.
May 25, 2011
2001 GMC Safari SL 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GTDM19W41
P0304: Cylinder 4 misfire. Replaced cap,wires,rotor and plugs. But there is still an intermittent Misfire at idle when hot Hoping for some advice from you safari experts Not familiar with these engines I was thinking injector but wanted advice from the more experienced before digging ou...
May 29, 2011
2000 Jeep Cherokee Limited 4.0L Misfire, MIL Lamp on VIN: 1J4FF68SXY
P0304: Cylinder 4 Misfire Detected. I Purchased this truck from a friend with a blown motor (had a blown head gasket and warped head). One of my techs and i replaced the motor with a Japser engine.This has been going on for the better part of one month, I'm out of sorts and at this point just lo...
May 30, 2011
1998 Ford Ranger XL 4.0L Misfire, MIL Lamp on VIN: 1FTYR14X8W
P0304: cylinder 4 misfire. I was posting to see if any other techs out there have seen this problem on Ford Ranger and I have also had it occur on Ford Explorer both with 4.0L engine. It will misfire and turn on the check engine light. I replace the plug on the cylinder it is showing (i...
May 31, 2011