P0300 Code (Help) Whats going on?

mattgarciachi

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The other day my wife went to start our 4 door LS 2.2 cobalt and it hesitating and coughing and the motor was wobbling back and forth....

Borrowed my freinds code reader and i got ONLY a p0300 actually 2 of them but it didnt tell me which cylinder.......

So the vehicle is misfiring.....

I never changed the plugs on that car so i went and bought some for the first thing.....

changed the plugs and its the same thing.......

Whats next on my list what should i do to continue down the line troubleshooting...........

Thanks
 

huckernage

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The other day my wife went to start our 4 door LS 2.2 cobalt and it hesitating and coughing and the motor was wobbling back and forth....

Borrowed my freinds code reader and i got ONLY a p0300 actually 2 of them but it didnt tell me which cylinder.......

So the vehicle is misfiring.....

I never changed the plugs on that car so i went and bought some for the first thing.....

changed the plugs and its the same thing.......

Whats next on my list what should i do to continue down the line troubleshooting...........

Thanks

change your coil pack
caminstallation001.jpg

which year ?
maybe a tune can solve it.
 

YelloEye

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Do the basics first man, check for the 3 things your motors gotta have, fuel, spark, and air. Pull the coil pack and plugs and insure you have spark on all 4 cylinders. Try resetting the ECU by pulling the negative cable off the battery for ~30mins.

Also welcome to the forum.

---------- Post added at 12:42 PM ---------- Previous post was at 12:38 PM ----------

What year? How many miles? Last fuel filter change? Does it smell like its running rich? lean?
 

1slobalt12

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im having this same problem, its just started today... mine smells like its running rich

my car has 61xxxk , ive never changed the fuel filter (bought the car with 33xxx) 2006
 

1slobalt12

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no im tuned by trifecta, i got the tune around 8 months ago and never had a problem with it
 
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huckernage

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you have now a p0300. ask your tuner to reflash it with p300 deleted.

you will still missfiring but W/O CEL on
 

1slobalt12

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yea but that wont solve the whole car running very rough and power lose im getting will it?
 

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