misfire cylinder 7
08-29-2005, 09:43 PM
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misfire cylinder 7 my car was throwing a ses light and it was flashing. i scanned it and the code was p0307. cylinder 7 misfire. i checked plug, wires, coil, injector, and o2 sensors. i changed the o2 sensors and extensions. the code went away. about 300 miles later the ses light came back on. not flashing though. still p0307. i cleared the code, and it still hasn't came back. if it does, what could it be? i heard that i could have a bent pushrod, but if it was a bent pushrod wouldn't the computer catch that quicker than 300 miles? i stumped, do you all have any suggestions? thanks
08-29-2005, 10:28 PM
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I bent my #7 pushrods but as soon as I cleared the computer the light came back on. If it doesnt come back I wouldnt worry about it. Does the car sound and drive like normal?
08-30-2005, 04:48 PM
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to 99ss00ws6, no the car doesn't sound different or drive different, but when the code is thrown, it does feel like it looses power. to tunafish, i thought about the plug in the beginning, so i changed the whole driverside. the #7 plug looked the same as the others. i don't know fellas, but could an exhaust leak or maybe an intake leak cause this? thanks for all of the suggestions.
09-01-2005, 07:21 AM
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#7 is always the first piston to experience problems, so the facto that it is #7 leads most of us to wonder if the piston ringland has cracked on your engine. I would also check your pushrods and valvesprings if the problem comes back to haunt you. I have seen these engines lose their valvesprings tension in 30,000 miles, and they can give you a misfire code. Bob
