sup everyone, well here's the deal, i have a 2008 cobalt ss/tc, 5 days ago the CEL came on, i started to notice that i was only getting like 8 psi on my boost gaugeso i went up to the dealership and they couldnt get me in for awhile, so i got on here first to see what it might be, and everyone was saying get it scanned so i got it scanned at autozone, and P2187 came up, System to lean at idle speed, and i asked the guy what the **** does that mean, he said that i was using to rich of fuel, and i told him i was putting premium in it, and he told me to go put some regular gas in it, but everyone i talked to said because of the turbo i needed to use premium, but anyways i got on here to see what anyone had already posted on the subject but im knew to the cobalt, sop i had no idea what was being said,but anyways i started to get my boost back up to 15-17 psi and 2 days ago the light went off, and today it came back on and im only getting 8 psi on my boost gauge, but the car is still stock, but any help would be awesome, thanks.

 

I checked the service manual and there are no P2187 codes listed.

 

Check to see that all your piping is tight.
Air must be leaking in or you could have a injector problem.
Just guessing on what it could be I have no listing for that code.

 

do not run reg haha, the gas is not the problem here hahahaha...
like stated, your prob having a vacuum/ bosst problem int he tubing

according to what i googled, it means system to lean at idle bank 1

do you have nay mods?? what conditions when this happened?

 

well i opened the hood and i noticed this, do you think this is whats causing my problems???

 

that would def cause an afr problem!