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post #1 of 8 (permalink) Old 09-03-2013, 04:56 PM Thread Starter
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Cel P0302.

Seems like a Common Thing for ecotecs Based on when i.google it.
I've Been Having Misfire code issue on and off. always p0302
i Changed the spark plugs, Ignition coil, and Injectors, problem would go away then return.
i.cleaned the valves. went away now its Back. bought a new TB because mine messed up. car runs fine but that CEL p0302 still There.
anyone have any Solutions to this Problem??

---------- Post added at 04:56 PM ---------- Previous post was at 04:55 PM ----------

Checked for Vacuum Leaks, fuses, etc. still There
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post #2 of 8 (permalink) Old 09-03-2013, 05:01 PM
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What year?

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post #3 of 8 (permalink) Old 09-03-2013, 06:10 PM Thread Starter
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What year?
2008 chevy cobalt ls 2.2
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post #4 of 8 (permalink) Old 09-03-2013, 07:31 PM
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You probably have a bad coil or boot. these are easily switchable and interchangeable. So switch 2 coils and check if code changes fron P0302 to the swapped cylinder.

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post #5 of 8 (permalink) Old 09-03-2013, 07:55 PM Thread Starter
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You probably have a bad coil or boot. these are easily switchable and interchangeable. So switch 2 coils and check if code changes fron P0302 to the swapped cylinder.

tried That Last Night. i Switched Out cylinder 1 And 2 plugs And coil stil cel Misfire on #2
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post #6 of 8 (permalink) Old 09-03-2013, 08:14 PM
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Is your coolant going down ever so slowly?

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post #7 of 8 (permalink) Old 09-03-2013, 09:50 PM
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What did the plugs look like/smell like?

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post #8 of 8 (permalink) Old 09-03-2013, 11:54 PM Thread Starter
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plugs have some carbon Build up but i Just Cleaned the valves last week with cleaner. coolant levels are the same always does not go down
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