P0304 OBD Engine Code Logo   Code #P0304 -
Cylinder 4 Misfire Detected

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A Check Engine Code of P0304 means that there was a misfire, specificially for Cylinder #4. You should check your spark plugs and spark plug wires and probably replace them, especially if have a Straight 4 Cylinder engine (very easy) or if Cylinder 4 is easily accessible. You should also check your catalytic converter to ensure its working properly and check your coils as well. You should also make sure that you wires are in the correct order as well.

Chevrolet Silverado 1500
Codes P0304, P0200, P0174


Suzuki Verona
What is the code p0304


Hyundai Accent
reduced power and idles rough


Lincoln Continental
MIS FIRES


Ford Expedition
replaced all spark plugs now has misfire # 4 cylinder


Toyota Tacoma
2001 yeay


car stumbles in drive and check engine light on

runs rough

Fiat Punto
code P0 304 ????


po304

Kia Optima
2004 kia optima po304 just started misfiring changed plug had core pack checked so it is geting fire but dont know if it is something else or what


Kia Sedona
idles rough


Po304 tried new wire new plugs new coil for spark plugs. Throttle position sensor. Still acting up why?

check engine light on, engine looses power on accerlation

Chevrolet Tahoe
Truck with vibrate and shake on eceleration getting on the freeway and up hills.


Suzuki SX4
Misfire in mid rpm range, half power at best, not safe to drive until repaired.


Ford Ranger
Definite miss, replaced wires, coil pack plugs and injector, with no improvement. Compression is low 90 psi in #4 cylinder.


Mush lighte on so far

Nissan Altima
Light on Sunday off Monday check it Sunday at auto store


Nissan Altima
Did get a tune up 2 year ago


check engine light came on suddenly. started missing really bad. this was on a weekend. after a day of driving light went off and it was only missing once in a while? check code showed po304?

Jeep Grand Cherokee
2011: driving about 30 mph. no noticeable symptoms. car still starts


Chrysler Town and Country
misfire


P0304

Nafa

Nafa

P0304

BMW 330i
P0304


Toyota Tercel
CILINDER 4 MISFAIRE


engine light on

2001 toyota corolla Code PO304. Intermittent misfire of cylinder 4. Changed spark plugs, coil, fuel injector, and performed a compression test. All cylinders 210.

Toyota Corolla
Light came on about 2 weeks ago. Car has no problem starting. Has a rough idle but seems to smooth out when driving.




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Other Comments

P0562 display on left side in the bottom corner on (display) Key Fob and Battery low clean battery post reset code with innova 3100

P0864 Djdi

P0742 Cadillac SLS
P0106 and P0742 OBD codes, SYMTOMS extremely poor fuel economy at low speeds


P0741 P0742 and P0106 are the codes that came up on my OBD scanner 2002 SLS Symtom, 11 MPG under 35 MPH, 27 MPG at highway speeds

P0603 2004 FORD F350 6.0 HELP PLEASE 3 DAYS AGO MY TRUCK WAS HAVING A HARD TIME STARTING AND RUNING NOT SO GOOD WITH BLACK SMOKE SO TOOK IT TO A SHOP THEY SCANED IT FOUND THAT THE FICM WAS ONLY GETTIN 33 VOLTS NO OTHER CODES CAME UP SO I PUT IN A NEW FICM AND IT STARTED AND RAN BETTER THE NEXT MORNING TOOK IT TO GET A OIL CHAGE IT DIE WHEN I WAS LEAVING AFTER THE OIL CHANGE IT WAS LOW ON FUEL PUT SOME FUEL IN THE WENT A FILLED IT UP AND PICK UP A AEM AIR SUPPLY KIT RAN GOOD ALL THE WAY HOME. LET IT COOL DOWN PUT THE NEW AIR SUPPLY KIT ON STARTED RAN GREAT 2 HOURS LATTER DRIVING TO THE RACES IT STARTED ALL OVER AGAIN WOULD NOT START BACK UP I WAS NOT HEARING THE FICM RELAY PULLED THE RELAY IT WAS REAL HOT WHEN IT COOLED DOWN I STARTED GOT HOME IT DIED SO I GOT A NEW RELAY IT STARTED RIGHT UP LET IT RUN FOR A HOUR SHUT IT DOWN 3 HOURS LATER IT WOULDN.T START PLEASE HELP check the three connectors to the ficm all good started ran it 4 1/2 hour went to a friends house shut it off 1 hour later would not start left it there next morning started it up drove home would not started 2 hours later put scanner on pulled up 4 codes P0603, P1000, U0105, AND U0306 I AM ABOUT TO PULL MY HAIR OUT Edit/Delete Message



Other Check Engine Light Codes

P0132   O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
P0189   Fuel Temperature Sensor B Circuit Intermittent
P0248   Turbo/Super Charger Wastegate Solenoid 'B' Range/Performance
P0509   Idle Control System Circuit High
P0763   Shift Solenoid 'C' Electrical
P0868   Transmission Fluid Pressure Low
P0908   Gate Select Position Circuit Intermittent
P0913   Gate Select Actuator Circuit High
P0965   Pressure Control Solenoid "B" Control Circuit Range/Performance
P0994   Transmission Fluid Pressure Sensor/Switch "F" Circuit Low




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