Join Now
International Automotive Technicians Network

P0304 Diagnostic Trouble Code Discussion for May 2007

Cylinder 4 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 P0304
Help Request Posted
1996 Chevrolet Caprice Classic 4.3L Hesitation, Cuts out, MIL Lamp on VIN: 1G1B152W1T
P0304: cylinder 4 missfire. help; this caprice came in runs rough warm. feels like missfire. put it on scope in drive under load cly 2-4-6-8 seems to have problem with fire line and spark line on scope when its running rough. on even clyinders from fire line to spark line does not start ...
May 01, 2007
2005 Ford F-250 Super Duty XL 5.4L Misfire VIN: 1FTNF20515
P0304: Fault Cylinder 4 Misfire Detected. ... f-250 5.4 3v that intermitently has a slight misfire also sets code p0304 &p0316 any sugestions would be appreciated
May 02, 2007
1998 Mercedes-Benz C230 2.3L Misfire, MIL Lamp on VIN: WDBHA23G1W
P0304: misfire 4 cyl. Dear Group , Please consider my latest affliction , I have read the fix archives about the MAF sensor problems common to this car . Usually with a P0170 fuel trim code this car does not have.This car has a horrific misfire and will barely pull out of its own t...
May 02, 2007
1999 Chevrolet K1500 Suburban 5.7L Misfire VIN: 1GBFK16RXX
P0304: Cylinder 4 Misfire Detected. This 99 Suburban came in wanting plugs to solve a missfire at idle. i insatalled the plugs and noticed number four had some build up on it. but it did not solve missfire. # four cylinder misses at idle only. It has great acceleration and runs great off idle. I...
May 03, 2007
2003 Ford Ranger Edge 3.0L Hesitation, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1FTYR14V03
P0304: Cyl 4 Misfire. Guys( I need HELP! This vehicle came in with several codes, the misfire codes being the major complaint. With the codes that were there I started with the injectors... they were fine, even changed with known good injectors with no change. Also there is a strng...
May 14, 2007
2000 Ford Taurus LX 3.0L Misfire VIN: 1MEFM55S2Y
P0304: cyl 4 misfire. ... already replaced the injector and ign coil for this cyl, and swapped plugs between cyls, to no improvement. my problem is that the car sets a p0304 (cyl 4 misfire) and has a lean code p0171 (bank 1 lean) that is pending. the ...
May 15, 2007
2003 Ford Ranger Edge 3.0L Hesitation, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1FTYR14V03
P0304: Cyl 4 Misfire. Guys( I need HELP! This vehicle came in with several codes, the misfire codes being the major complaint. With the codes that were there I started with the injectors... they were fine, even changed with known good injectors with no change. Also there is a strng...
May 15, 2007
2004 Ford Focus ZTS 2.0L Stall, Misfire, MIL Lamp on VIN: 1FAFP38314
P0304: 4 Misfire. ... codes p0304(#4 mis), p0204(#4 injector), and o2 sensor biased rich. It has good spark, fuel pressure and leakdown passes. I switched injectors and still #4 misfire. I have gone through all the processes in 'service info' and all values are within specs. I ...
May 17, 2007
1998 Subaru Legacy Outback 2.5L Misfire, MIL Lamp on VIN: 4S3BG6851W
P0304: Cylinder 4 Misfire Detected. We replaced the short block (from dealer) about 6 mo. ago and cleaned heads and set valve clearance. Customer says check engine light has been on for a month with misfires on all cylinders. We cleared the codes and test drove. Engine misses at freeway speed un...
May 19, 2007
2005 Subaru Legacy GT Limited 2.5L Poor Idle Quality, Misfire, MIL Lamp on VIN: 4S3BL67675
P0304: Cylinder 4 Misfire Detected. I have this turbo/race Subie here that idles rough and sets misfire codes at idle only after a thorough test drive. Runs very strong cold and at speed,the hotter it gets the worse the misfire when you return to idle,if you drive it 10-12 miles it will turn the...
May 21, 2007
1997 Dodge B2500 3.9L Cuts out, Misfire, MIL Lamp on VIN: 2B7HB21X3V
P0304: Cylinder 4 Misfire Detected. Van originally came in with a low charging voltage & misfire # 4 cylinder code with a complaint of no power. Scoped the ignition & found a bad plug wire to number 4. Replaced the set with a new cap & rotor. Looked good on the scope & test drove...
May 23, 2007
2004 Honda Accord EX 3.0L Poor Idle Quality, MIL Lamp on VIN: 1HGCM81794
P0304: Cylinder 4 Misfire Detected. Don't want to shoot from the hip on this one. There is obviously something common to all cylinders causing this rough idle. I have spent a lot of time looking at data, and cannot find anything out of the ordinary. This car seems to drive perfectly fine, smooth...
May 30, 2007