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P0304 how to solve this problem

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Cod p0304 refers to cylinder 4- misfire detected==causes--engine mechanical fault--wiring---ignition/ fuel system--injector---ECT/MAF sensor--ecm. I would be looking at a faulty injector in no4 cylinder unless you have a burnt valve. Have a compression test done to eliminate mechanical failure.

Posted on Jul 19, 2013

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With a p0304 - there are a few thing it could be.
1. The spark plug is bad. You can test this by switching plug 4 with 3 and if the misfire comes on three, then it's the spark plug. Also make sure the connectors are setup in the order made specifically to your car. 1 needs to be with cylinder 1, 2 with 2, etc.
2. It could be the coil pack. You can take this out and inspect them as well as clean them. You can use rubbing alcohol to do this. Find your specs on voltage - if you have a multimeter, you may be able to test this.
3. If it's your injector, you can test this too with a multimeter. Just set it to ohms, i'd say 20 should work. Unplug the piece plugged in next to the injector and put the red and black probes on the metal prongs. Check your car specs for what it should be reading but generally - if you get nothing, especially on 4, it's no good.
4. You can do the screwdriver test for the injectors. Just get a long screwdriver, turn the car on and place it on the injector itself. Feel with your thumb or put your ear to the screwdriver. It should pulse. Injectors are like an electric solenoid that creates a magnetic pulse. If you notice a weak pulse or no pulse, especially on the misfiring cylinder, it's no good.
5. Is all this checks out, you can do a compression check to check the psi which will tell you the condition of your engine. Look up your specs. You can do a wet and dry compression test. You will want to youtube videos for how to do this and investigate your car, first, or have it professionally done if you are not sure. Things can fry depending on hookup, things not being unplugged right, etc.

Posted on Jul 20, 2013


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I scanned vehicle obd scanner and got code P0304 misfire #4. What should I look for? To solve problems

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