P0300 Code (Help) Whats going on?

[mattgarciachi]

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]

Originally Posted by mattgarciachi 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
which year ?
maybe a tune can solve it.

[YelloEye]

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?

[cobalt123]

^x2 welcome btw

[1slobalt12]

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

[huckernage]

Originally Posted by 1slobalt12 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

are stock tune

[1slobalt12]

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

[huckernage]

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

you will still missfiring but W/O CEL on

[outtamymind]

Originally Posted by huckernage you have now a p0300. ask your tuner to reflash it with p300 deleted. you will still missfiring but W/O CEL on

and thats how motors are blown up.

[1slobalt12]

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