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P0304 Diagnostic Trouble Code Discussion for February 2015

Cylinder 4 Misfire Detected


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Trouble Ticket Help Requests for DTC P0304
Help Request Posted
2007 Ford Ranger XLT 3.0L Poor Idle Quality, Misfire VIN: 1FTYR44U57
truck was brought in and I see new coil and wires also plugs new . did a compression test seem to be fine with all cyl about the same.. checked inj with light seems to be ok flashing bright and steady all inj look the same. this truck has a slight miss at idle...
February 03, 2015
1998 Ford Expedition Eddie Bauer 4.6L Poor Idle Quality, Misfire VIN: 1FMRU18W1W
P0304: Cyl 4 missfire. This thing is driving us nuts, even after we replced engine it seemed a little rough at idle but we left it go, weren't sure. But its back and we have inspected and check everything we can think of and still at idle or brake torqing at 1500 rpm we feel an roug...
February 04, 2015
2007 Ford Ranger XLT 3.0L Poor Idle Quality, Misfire VIN: 1FTYR44U57
truck was brought in and I see new coil and wires also plugs new . did a compression test seem to be fine with all cyl about the same.. checked inj with light seems to be ok flashing bright and steady all inj look the same. this truck has a slight miss at idle...
February 05, 2015
2010 Toyota Corolla XLE 1.8L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 2T1BU4EE4A
P0304: cylinder 4 misfire. ... I'm just stumped on. This woman filled it with diesel fuel back in december 2014. We cleaned out the tank, flushed lines, and performed an injector cleaning service and all was well (didnt replaced pump module just cleaned it due to over a grand from toyot...
February 06, 2015
1999 Audi A4 1.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: WAUBB28D1X
Vehicle came in with rough idle complaint. previous repairs were MAF, Throttle body, Injectors, Coils, plugs, ignition control module, and PCV assembly and hoses. Concern was still there so customer brought to us. verified all parts that were replaced were all...
February 09, 2015
2004 Volvo XC90 T6 2.9L Cuts out, MIL Lamp on VIN: YV1CZ91H24
We do not have any VOLVO specific scan tool. We can retrieve codes with our GENISYS EVO, and our AUTEL, but neither tool will deliver data stream. Our vehicle starts and runs normal with a slight roughness. Car will randomly stall coming to a stop, but always ...
February 09, 2015
2006 Volkswagen Passat 2.0T 2.0L Misfire, MIL Lamp on VIN: WVWAK73C66
P0304: cylinder 4 misfire. Help VW techs! We have this 2.0t Passat in for intermittent rough run- po304 set in ecu. We had done a service about a week ago that included new plugs. We performed basic checks- compression good- good signal to coil and injector- we found a dead coil. We rec...
February 12, 2015
2000 Subaru Impreza Outback 2.2L Misfire, MIL Lamp on VIN: JF1GF4858Y
P0304: Cylinder 4 Misfire Detected. Hello all. So, vehicle has cylinder 4 misfire. Tune up good, I have good spark, fuel pressure is dead on, I have pulse at injector, timing marks are spot on. Compression is 165 across the board. Did leakdown test and had 10% leakage. Pulled valvecover and chec...
February 14, 2015
2002 Chevrolet Astro 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCDM19X62
P0304: cylinder 4 miss fire. Ok so this thing has a dead missfire on cylinder 4 at idle according to my scanner. You can watch the missfire counter for #4 run up like its not firing at all. I've replaced the #4 injector, swapped plugs and wires, checked compression( which is about 130 on ...
February 16, 2015
2004 Subaru Outback L.L. Bean 3.0L Misfire, MIL Lamp on VIN: 4S3BH80614
P0304: Cylinder 4 Misfire Detected. Hi all, We have a 2004 Subaru Legacy Outback with a 3.0L. Came in with a check engine light. A--- Z--- Parts store said it their code read was that it had three misfires. Cylinders 2,4,6. After checking we have found the Air/Fuel sensor reading too rich on ban...
February 24, 2015
2001 Jeep Cherokee Sport 4.0L Poor Idle Quality, MIL Lamp on, Low vacuume VIN: 1J4FT48S01
P0304: Cylinder 4 Misfire Detected. Vehicle has low engine vacuum at idle 14in at 1500 rpm vacuum is good at 20in. I have removed front cover to check cam timing looks ok. Checked compression ok. Checked cam and crank sensor correlation physical and with lab scope ok. I believe that I could ha...
February 28, 2015