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post #1 of 3 (permalink) Old 03-14-2014, 12:11 PM Thread Starter
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Help! '09 Cobalt P0300 - P0304 Engine Codes!!!

2009 Chevrolet Cobalt, 2.2L, Engine Code P0300, P0304

I have replaced the spark plugs, tested the ignition coils (all work), replaced the Intake and Exhaust Solenoids (This cleared up some other codes and eliminated the rough idle), but I am still receiving a P0300 and P0304 codes. I swapped the ignition components (Plug and Coil) from Cylinder 1 to Cylinder 4 to see if the misfire followed the cylinder and it did not.

Now I am being told to look at the Camshaft Position Sensor and if not that, the ignition module. Which is more the likely the culprit?

Also, if it is the CPS, do I have to manually turn the crankshaft to put the cylinders in a specific position prior to replacement?

Thanks in advance for any assistance!
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post #2 of 3 (permalink) Old 03-14-2014, 01:09 PM
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Swap injector 4 to a different cylinder and see if misfire follows

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post #3 of 3 (permalink) Old 03-14-2014, 09:21 PM
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noid light on injector 4 would probably be a good idea too. just to make sure your getting fire to the injector. swapping injectors would do the sme as previously stated but would require a little more work

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