Misfire in cyclinder 4-this is a fuel injection vehicle

Question edited for clarity and the typos - Nissian, cyclinder, vam, and PO 304 is P-zero not P-letter Oh..
Question moved to model category

What makes you think it is the Crankshaft Sensor? This is a simple misfire on Cylinder 4. Check plug, leads and coil. Run some Injector cleaner.

The P0304 code stands for "Cylinder 4 Misfire Detected", which means your vehicle's cylinder 4 has misfired enough times for your powertrain control module (PCM) to notice. A worn spark plug, a faulty fuel injector, and a leaking valve are some possible causes of the P0304 code.
Jul 28, 2023

P0304 Code: Cylinder 4 Misfire Detected - CarParts.com

https://www.justanswer.com/nissan/58ol6-2004-nissan-quest-5spd-where-crankshaft-sensor-located-diy.html

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misfire when fueling ???? You leave the vehicle running while fueling ?

The PCM kills cylinders when misfire malfunctions occur. This is normal operating procedure for an obd2 equipped vehicle. Voltage for both the coils and the injectors in your vehicle come from the fuse box. I hope that this helps.

misfire in all 4 cyclinders hmmm...... compression tester check compression 125psi is good 100 and lower is bad (head gasket they go bad) if that is good, do fuel filter,, or charge system is bad, or bad ground or bad coil

indicates a low fuel pressure problem
random misfires are predominately fuel pressure related rather the electronic
check pump operation , pressure regulator, filter , and EVAP for not venting the fuel tanl

You should have the dealership replace all of the spark plug wires, not just 4 of them. If the vehicle still vibrates like a misfire you may need to have your timing checked/adjusted. It may also be time for a new fuel filter.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

we usually replace head gaskets when there is an overeating problem or leak problem, if you saw coolant in the spark plugs or if the misfire come with a thick white smoke from the tail pipe, then this is reason enough to do the head gasket job.


for random misfire we got spark plug wires high resistance,
weak coil,
bad fuel,
weak fuel pump.
bad injectors.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/flavio_517b938f50183b92

check for spark at the coil, if its weak, or no spark, replace the coil pack.

THE P0302 is misfire cyclinder 2,4,and 5
The P1313 P1316 is Cyclinder compressor low, Worn camshaft/ broken valve springs. Fuel injector contamination, Spark plug failure/ incorrect gap. Iginition coil failure.
P0778 is 2/4 Brake prssure solenoid failure

HOPE THIS CAN HELP.

I would check the fuel injector on number 2 cylinder. If the injecter is dirty or not functioning properly it may give you the symptom of an ignition misfire.