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post #1 of 5 (permalink) Old 10-03-2012, 11:57 PM Thread Starter
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Help Check Engine and Overheating

My check engine light has been coming on for a few months. But today I had pulled over for a few min.next I see the check engine light start flickering the coolent temp is at 220 and the car starts jerking like its going to turn off.push on the gas moved the car seemed fine for a few min did it again but worse.what can it be I bought a OBDll code reader and it said P0303 .what could it be please help..need help ASAP need car to keep looking for work and to take my son back and forth to the hospital.
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post #2 of 5 (permalink) Old 10-04-2012, 03:45 AM
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i have no personall experience with cobalts and this issue, but the same thing happend to my old explorer and it turned out the be the water pump had gone bad. Im sure Coby7 can give you some insight to what that code means though.
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post #3 of 5 (permalink) Old 10-04-2012, 05:11 AM
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What year? 220 is normal for a car at idle, it will fluctuate between 192 and 235 as fans come "on" and "off".
When is the last time you had a tune up?
My guess....
You need to get your throttle body cleaned and if you waited too long to the point where you are getting "Check Engine Light" you will probably need new spark plugs.
"P0303" is cylinder 3 misfire. If this is truly the only code you have don't worry but get it looked after if you can't do it yourself. This is your Cobalt telling you it needs attention.

Try cleaning the throttle body first... this alone might clear the misfire. If your engine runs good after this intervention and you still get the "P0300 to P0304" down the road then change your plugs.

After these two procedures you should be good.

Don't wait to long because this condition will deteriorate your HO2 sensors and catalytic converter. That gets costly.

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Last edited by Coby7; 10-04-2012 at 05:33 AM. Reason: one "the" to many
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post #4 of 5 (permalink) Old 10-04-2012, 06:28 AM
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ra.goodwin,

Welcome to the forum! Coby7 has already given you some great insights into what may be happening with your vehicle; if I can look into anything further (check into warranty or recall information for you, assist in working with a dealership, etc), please let me know and I will get you my email address (as you're new to the forum, I don't believe you can private message quite yet).

Sarah, GM Customer Service
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post #5 of 5 (permalink) Old 10-06-2012, 08:10 AM
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Quote:
Originally Posted by Coby7 View Post
What year? 220 is normal for a car at idle, it will fluctuate between 192 and 235 as fans come "on" and "off".
When is the last time you had a tune up?
My guess....
You need to get your throttle body cleaned and if you waited too long to the point where you are getting "Check Engine Light" you will probably need new spark plugs.
"P0303" is cylinder 3 misfire. If this is truly the only code you have don't worry but get it looked after if you can't do it yourself. This is your Cobalt telling you it needs attention.

Try cleaning the throttle body first... this alone might clear the misfire. If your engine runs good after this intervention and you still get the "P0300 to P0304" down the road then change your plugs.

After these two procedures you should be good.

Don't wait to long because this condition will deteriorate your HO2 sensors and catalytic converter. That gets costly.

This is good here, just want to add one thing. Try putting some injector cleaner and running that for a tank. I use Sea Foam, and it works very well, also check your air filter as well. Not enough fuel (injector cleaner), and not enough air will cause a good misfire. what it sounds like to me is that the injectors are slightly gummed up and would need a good cleaning because they may not be priming enough to start them, thus needing a few cranks to start. A good cleaning of the TB and injectors will make your car run a million times better.

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