I own a 2007 Cobalt LT and I recently just put a K&N Short Ram Intake on it. It's not a huge mod but every time I start the car it idles rough with the rpm's jumping up and down for about 30 seconds, then settles. I suspect that it is running lean now that the intake has been added but would definately like some second opinions.

 

Did you disconnect the battery when you installed it??

 

i dont think so...

 

You're not running lean...

Check your MAF sensor and how it's placed inside the tube.

A intake upgrade will not make a car run leaner, especially at idle when the throttle plate is closed anyways and keeps the engine running through the IAC (Idle Air Controller).

 

very true...now i feel dumb, haha. I'll go head and check it when i get a minute but i'm pretty sure its clean and everything, i just swapped it from the stock to the new one, didnt leave it sittin around or anything.

 

i would double check the maf like said, also make sure everything is tight.

 

Don't feel dumb if you didn't know.

Good luck.

 

I pulled out the MAF sensor and everything looks good to me, it is fairly new, just hit 8000 miles the other day. What would I be looking for exactly?

 

buy some maf cleaner and give it a cleaning.
theres a possibility your K&N filter oil may have gotten onto the maf.

 

check for a leak on the intake if it's loose around the throttle body it wil cause that issue. Clean and check all sensors reattach and make sure everything fits tight. Disconnect the nrgotober battery terminal for 30min. when your done drive for about 15-30 min and it should start to clear up as the ecu adjusts

 

alright check the MAF and clean it. just cuz u cant see oil on it doesnt mean it isnt there also idk about ur model but on the ss/sc when u do something like this u disconnect the neg. terminal on the battery for about 5 mins reconnect it and turn it on and let it idle for about 5. our ecu's re-adjust automatically for the more air flow

 

This thread is old, and why is it in the south pacific section?

 

anytime you do anything that requires unplugging of anything, especially electrical, unplug the battery. the computer does need to reboot and it happens almost instantaneously when the battery was disconnected first