Help 2012 cr-v ex-l 2.4l p0304 - The unofficial Honda Forum and Discussion Board Forums For Honda automobile and motorcycle enthusiasts.


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Old 10-09-2017, 04:54 PM
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Default Help 2012 cr-v ex-l 2.4l p0304

Any help is appreciated. Was driving and without any strange noise or warning a steady misfire started. Vehicle is chain drive NOT belt. 90k miles Did code check P0304 "permanent" and won't clear. Changed all spark plugs & cyl#4 ignition coil. Battery was disconnected during repair. Reconnected battery. Code remained. Started CR-V still had a heavy miss on cylinders #4 & P0304 still remained. Swaped around coils. Miss still on cyl 4 with code. Pulled all spark plugs to do compression test. Results are
cyl#1 approximately 200psi
cyl#2 approximately 200psi
cyl#3 approximately 60psi
cyl#4 approximately 0-7psi
no coolant loss or overheating. No coolant in oil.
Pulled off valve cover to visually inspect valves, valve springs & cam. Disconnected injectors. And turned enging to see valves moving. Everything moves as it should. NOTHING VISUALLY BROKEN OR NOTABLE
Put cyl #4 at TDC. Applied shop Air to cyl 4 and can hear air escape into intake manifold & come out of cylinder 3 spark plug hole.
Car very well taken care of. Not driven hard ever.
Trying to help out a family friend. Single mom in a tight spot
Please help!!
???what do you guys think?????

Piston Rings?
Cracked Head?
broken valve seats?
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Old 10-09-2017, 09:09 PM
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welcome to the forum. glad you're trying to help, my thoughts, possible blown head gasket, when you take the head off, you can also check for valve leak or do a visual on gasket. if you replace head gasket, mill the head to eliminate possible warp, kind of unusual for 90k and low compression.
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