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Discussion Starter #1
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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What year?
 

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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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Discussion Starter #5
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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Is your coolant going down ever so slowly?
 

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Discussion Starter #8
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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