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]

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]

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]

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?

 

[huckernage]

and thats how motors are blown up.

no that is how cat dead

i ve driven my car with p300 for 3 years. it not ready to give up still strong



he can missfire just on idle and running fine when riding

 

[outtamymind]

seriously though it could be a few things. could be clogged cat, clogged fuel filter or fuel lines, could be too cold of air coming in for your tune, could be plugs/coil pack. with a misfire it could be a few of those things as well.

and huckernage, supressing a code like that will only hide the code, there is still a reason that the car is misfiring and that should be looked into as if he doesn't it will lead to other things going wrong down the road. misfires are usually due to your a/f ratio being off whether it be too lean or too rich. its a matter of figuring out which one it is and finding out why.

 

[huckernage]

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

you feel that much power lose. have you film it?

with my p300 light on i was running low 15S'. in my case no power lose

---------- Post added at 09:38 PM ---------- Previous post was at 09:36 PM ----------

are you stock spark plug

 

[outtamymind]

you feel that much power lose. have you film it?

with my p300 light on i was running low 15S'. in my case no power lose

---------- Post added at 09:38 PM ---------- Previous post was at 09:36 PM ----------

are you stock spark plug

i can gaurantee you, you had power loss. if you fix the reason why its misfiring you could be a high 14's possibly

 

[huckernage]

i can gaurantee you, you had power loss. if you fix the reason why its misfiring you could be a high 14's possibly

my average was low 15 with some time in 14S. it was more on idle. when ''pop'' was, P300 light on 4 secondes after that.

saturn were not able to fix it. they ve changed coil pack and spark plug and still missfire occurated. they put an injector cleaner but......

 

[outtamymind]

i'm not saying your not gonna get some misfires, i do in my car but when they are bad enough to set off the CEL then there is a bigger problem.

 

[elecblue06]

hmm shit alex if you want to we can take a look at it it could be due to the shitty gas this time of year have you tried using the next grade up?

 

[bryson87]

check plugs pack fuel filter and cat. push comes to shove get u a compression tester and make sure its not a cyl i dont think it would be but you never know

 

[1slobalt12]

hmm shit alex if you want to we can take a look at it it could be due to the shitty gas this time of year have you tried using the next grade up?

i have been using 93 pretty much everytime i fill up but i did mix in a half a tank of 91 like a day or so ago. but i dont think it would be that unless its shitty gas... im going to be taking it to my mechanic tomorrow if he is open i let you know what happens

im getting a major loss in power not just a little and im not stock spark plugs i forgot which ones but i put them in last winter

 

[1slobalt12]

Got my car back from the mechanic , it was the ignition module