Cold Weather Lean Code
 

Would cold weather case a lean code? I have a blackbear tune and when it got cold the codes were thrown.

Thank you

Cold weather lean codes could mean that the intake gaskets are leaking.

is it running rough or anything?

Everything is running fine. Actually the check engine light went off today but the codes were still in the system. Had them erased and was going to scan it again in a couple of days to see if they popped back up.

If it idled rough when cold out and got a lean code that's normally a sign of an intake gasket leak as scooter said.
If it's running fine i'm not really sure unless it's just a really small leak.

How cold are you talking about? It's -10F here today, no lean codes, and I'm running my speed density tune that I "tuned" last summer. So far it's been running just fine as low as -20F. I drive my truck every day that it doesn't have a broken transmission.

Being from Florida, cold here is 40F. Truck seems to be running fine just threw some codes.

Just used my extreme example to show you that I don't believe the "cold weather" is the reason for the lean condition. It's likely lean for another reason, like intake gaskets, fuel delivery, or bad/dirty MAF if you're running one.

Post up what you find wrong with it.

Try cleaning the MAF. the IAT sensor could be dirty

Hmmmm, i'm glad i read this. my truck throws a code too every time i let it idle too long. might have to check my intake gasket too.