whitegmc2003

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

Thank you

scooter k

iTrader: (22)

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

viciousknid

iTrader: (8)

is it running rough or anything?

whitegmc2003

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.

viciousknid

iTrader: (8)

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.

AKlowriderZ71

iTrader: (22)

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.

whitegmc2003

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

AKlowriderZ71

iTrader: (22)

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.

viciousknid

iTrader: (8)

Try cleaning the MAF. the IAT sensor could be dirty

skoal bandit

iTrader: (1)

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.