So I just purchased an 06 Cobalt SS/SC with 70k on it and the only aftermarket part is a Spectre Intake. Now I have to admit I really dont know very much about the car. One of the first things I noticed was the idle rpm seems a little high, like 950. I was wondering what they usually are. I also recently got a check engine light the code was P0172 bank 1 system too rich. Im guessing thats from the intake but donno how to fix it.

 

That code basically means that your fuel trims are below -20% (engine is cutting over 20% fuel). This I can almost guarantee you is due to your intake. The fact that your idle is so high leads me to believe 1 or more of a couple things, 1: the car is tuned but it's a god awfull tune, 2: you aren't tuned and the ecm is compensating for something, 3: you may have a boost/vacuum leak somewhere which could be what the ecm is compensating for at idle, and this can also cause wacky trims due to unmetered air entering the engine.

Either way, something isn't right with the car so it needs to be addressed. I see you're pretty local to me, where did you get the car from if you don't mind me asking?

 

Well i think idle is usually around 800 i can tell ya that

 

yeah stock it's supposed to be 750

 

Thanks its a good thing the dealer talked me into getting a 3000mile warranty

 

MattCT,
It looks like you're going to be taking advantage of that extra warranty and have your dealership look into this; if I can be of any assistance, I'm happy to help in any way that I can!

Best,
Sarah
GM Customer Service

 

750 stock idle?
My cars always idled at 850.

 

off topic but how much did you pay, i got my red 07 ss/sc w/77K miles for $7,800.

 

lol.. I don't know what to tell you man. I don't make the rules. I'm just telling you what I see when I open the stock tune files for lsj's in hpt. I attached a screen shot of both an 06 and 07 lsj idle speeds based on engine temps. At normal operating temps the target idle speed for the ecm is 750rpm..

[IMG][/IMG]

 

I paid 11 grand for mine which i thought was a good deal cuz the blue book value was closer to 13. I had looked at and ion that was alot cheaper with less miles but i just couldnt get past the strange dashboard with all the gages in the middle...

 

.The center gauges aren't bad at all. After you get used to it, you hardly notice it.

 

I think you may have the same thing happen to you that happened to me.
Check your fuel injectors. See if they have green parts on them.
If they do not, then your fuel injectors have been upgraded and its likly that your PCM was programed by the dealership backto the Factory settings. You'll need to get a tuen to get that corrected.

 

"off topic but how much did you pay, i got my red 07 ss/sc w/77K miles for $7,800"
Where are people finding there cars for this cheap, everything here in texas is way over priced, riced out, or beat to s***. The cheapest ss ive found is an 05 with 102k, for 7k, and its been beat hard!

 

unmetered air leak wont cause a rich condition..... just sayin