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P302 code fixed now P300???

Hello everybody, So about a week ago randomly, my car started misfiring randomly while I was driving. Drove it home (i was a couple minutes away when it happened) and

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Old 12-03-2020, 07:10 PM   #1 (permalink)
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Default P302 code fixed now P300???

Hello everybody,

So about a week ago randomly, my car started misfiring randomly while I was driving. Drove it home (i was a couple minutes away when it happened) and parked it in the garage for a few days. Plugged in the OB2 scanner and was getting a P302 (misfire cylinder 2)code. Did my research and the most common reasons why the car would throw that code is because of bad sparkplugs, bad ignition coils, dirty throttle bodies and dirty mass air flow sensor. Well I changed all my spark plugs, tested all my ignition coils, cleaned both the throttle bodies and the MAF's. Fired her up and it ran a little better but still had the rough fluctuating idle and the car shook a little. Bascially sounded like it had cams.

So after doing all that, im throwing a P300 code (all cylinders misfiring). Went to my local trusty mechanic and he said all the sensors didnt come up bad on his scanner and it was probably just a bad battery. Bought a battery and installed it and I have the same exact issue.

Anyone else know what this may be before I go to another shop.

Thanks everyone and hope everyone has a great weekend
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Old 12-03-2020, 07:15 PM   #2 (permalink)
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Hello everybody,

So about a week ago randomly, my car started misfiring randomly while I was driving. Drove it home (i was a couple minutes away when it happened) and parked it in the garage for a few days. Plugged in the OB2 scanner and was getting a P302 (misfire cylinder 2)code. Did my research and the most common reasons why the car would throw that code is because of bad sparkplugs, bad ignition coils, dirty throttle bodies and dirty mass air flow sensor. Well I changed all my spark plugs, tested all my ignition coils, cleaned both the throttle bodies and the MAF's. Fired her up and it ran a little better but still had the rough fluctuating idle and the car shook a little. Bascially sounded like it had cams.

So after doing all that, im throwing a P300 code (all cylinders misfiring). Went to my local trusty mechanic and he said all the sensors didnt come up bad on his scanner and it was probably just a bad battery. Bought a battery and installed it and I have the same exact issue.

Anyone else know what this may be before I go to another shop.

Thanks everyone and hope everyone has a great weekend
Check this recent thread:
"P0302 & P0300 codes"
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Old 12-03-2020, 07:17 PM   #3 (permalink)
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Check this recent thread:
"P0302 & P0300 codes"
I did I commented in it. Didnt know if anyone else had other solutions.
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Old 12-03-2020, 07:27 PM   #4 (permalink)
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I did I commented in it. Didnt know if anyone else had other solutions.
Ok
Did you try looking at vaccum or intake air leaks because you haven't mentioned that?
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