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 Old 07-25-2011, 07:26 AM   #1
 
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Default CX-7 cylinder 4 misfire code? need help

Have changed the spark plugs, Checked the coil pack on another cylinder but still comes up with the same code p0304 cylinder 4 misfire.

Car is running horrible? any sugestions?

Car is stock with no upgrades except wheels. 86,000 miles
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 Old 07-25-2011, 12:27 PM   #2
 
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Dirty valves, bad injectors, compression. I would do a compression test and make sure u have power and cycling ground at your coil.
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 Old 07-25-2011, 12:34 PM   #3
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Tke a look at this thread.
http://www.mazdaspeedforums.org/foru...misfire-68182/

I think the Po302=cyl #2 and P0304=#4.

Might be why.
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 Old 12-13-2014, 07:39 AM   #4
 
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I have 07 cx 7 with 86k miles and have a misfire in cyl 3. took it dealer and they said piston ring is bad.
issue started with a weird idle during cruising speeds, thats it.

luckily I have ext warranty and getting a mild rebuild with new piston rings, connecting rod bearings, new EGR, and new motor mount under warranty.
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Default 2007 Mazda CX 7 Misfire Cylinder 4

Hello, Iím happy to find a forum without the vendors & junk that accompanies their ads.
Iíve been having a horrible time trying to fix my car. Iíve replaced plugs, coils, and the computer. Itís becoming very costly & I desperately need to find a solution. Iím hoping someone here has some experience with this issue and can share some wisdom!
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