Ok guys and gals. I have a 06 SS S/C with 12 k on it. The problem I am having has been going on for about 7000 miles. When I excellerate my car has what feels like a miss. If I excellerate slowly it is really noticable. But if I get into it hard it only does it until the supercharger kicks in then everything is fine. I have taken it in about 6 times for the same problem they can not duplicate it. They have checked the flashes everytime and still nothing. Any help would be nice. If not I will keep everybody informed. Thanks

 

Welcome by the way. lol

Have they checked your injectors, or spark plugs?? Might be a bad injector or a fouled plug or two

 

Lets clarify the symptom. You state the problem is more noticeable during a slow, easy acceleration rather then a hard one, correct? Is there a noticable loss of power, or is it just shaking?

 

I have what sounds to be the same problem. It is usually at lower rpms, and will happen more at part throttle but for a second even under full throttle

 

Sounds to me like your breaking up through the rpm band, could be a bad spark plug or inector.

 

is it possible a bad mount could cause this effect?

 

Yes. That is the most likely cause actually. That's why I'm curious if there is actual power loss, or just shaking.

 

i don't think there is a power loss. Will a delaer blame a broken mount on abuse or will that be warranty?

 

yes power loss until full throttle. Just feels like it is missing. Yes they have check the injectors and plugs. The dealer says it is my fault the way it runs. They say it is my driving conditions. But I told them if i drive it so hard why am I getting 28.9 to 29.4 mpg in the city. LOL Now the regional service manager is in on it.

 

They said that? They actually said the reason your car is running poorly is your fault? Did you proceed directly to the nearest manager and complain?

If your injectors and plugs are good, the next items to check are the ignition control module and crank position sensor. Those are ignition items. I am leaning toward fuel however due to the full throttle item. If it runs normally at WOT, the ECM runs a different fuel program. So I'm thinking you are having some kind of fueling issue. Except, that would throw a CEL from the O2 sensor.

 

Yes now they are saying it is a normal condition of cobalt ss supercharged cars. anyone believe that.

i am getting ready to return it under the lemon law.

 

Could even be a problem with the MAF too. I had to replace mine as it was doing the same. However you would have chucked a cel

 

What is the maf and cel

 

Mass Airflow Sensor - Mounted in the expansion box of the stock intake system in your driver's side fender well.

Check Engine Light - Between your speedo and tach...

 

i am a little new to 4 cylinders and modern sports cars. I usually use runn v8 sports car.

 

V8's also have a maf and a check engine light of sorts.

If this is a "normal" problem, which I call bs on, they still owe you the root cause of what is going on here. They are going to have a hard time explaining root cause without it sounding like a defect in the car. Ask them for root cause, send it to gm hq, and go to another dealership to have it looked at by someone who knows whats going on.


Also, take a shop monkey out in a balt off the lot which doesnt have this issue, then take him out in yours then ask him to explain to you again the part of the story where this is normal.

I am pretty sure you are getting played here if this is acurate.

 

the v8 cars i work with are old ones so no maf but one has a check engine light. and yes i agree they r playing me. i have alot of people at the dealership pissed at me. i am going to work problem soon.

anyone know what the atp is in a cobalt

 

atp? Is it an acronym for something?

 

Ok first thing one of the times i took it in the they put a vdr on it so i could take snap shots of engine when prob happens. The told it could possible the atp in it. but when i brought it back they said they do nothing with it at this time

 

What?

 

Check your air filter

If it's clogged or wet, that will happen to you.

 

Ok first thing one of the times I took it in they put a vdr (vehichle data recorder) in it so I could take snap shots (that is what they called them) of engine system when problem happens. Then after the GM TAC team check the vdr files they told me it could possible be the atp in it. So had me bring it back in so they could do some more tests on it. But when I brought it back they said they can do nothing with it at this time. And then they told me if a recall come in for it they said they would call me.

This make more sense.

Plus I have checked everything I can check. Air cleaner, fuel injectors, spark plugs, and ignition coils.

 

So your question is; What does ATP stand for with regard to a Cobalt? Correct? I don't know myself.

 

What about the throttle position sensor ,if its flaky could cause somthing like that to.
Also ignition module but I think they normaly out right fail.

 

i have 20, 700 miles on my car and i have a miss at idle and during acceleration, the car seems to studder if you will. like its just missing like crazy or struggling to find the correct air/fuel ratio. i am not sure but it is definatly annoying. for instance racing a vet last night, i was getting on it and it seemed like it didnt want to go, it was just studdering and finally got over it and went until i shifted again. i know its not because i was shifting too low, i mean i was running to 6k rpm. it will do this during normal driving as well. does anyone have any information on this or had similar experiences?

i took it into the dealer because it has been bothering me and they drove it and took snap shots of when it was doing it with the tech II but said everything looked normal. sooo they said maybe it was normal, but i have a hard time believing that....

i read mention of a possible undersized fuel rail causing problems in the #4 cyl. can someone please explain this a little more to me? and could this cause the problem i am having? thanks