1995ta383

What would cause my car to go lean only when it is in closed loop. I never had any problems for 9 months then I welded a little on the body, forgot to disconnect the battery. Now im having this problem. I dont know if the welding had anything to do with it but maybe. And if so what could this have screwed up. Any help would be appreciated.

MEAN LT1

iTrader: (2)

How lean is it getting?. Are you getting yuor data from a wide band or Datamaster? What bank is it showing lean on?.

1995ta383

its going 16:0 and thats from my wideband

C_Rules

iTrader: (7)

if you have datamaster also check what your fuel trims look like. they should be close to 128.

1995ta383

I dont have a datamaster but I do have an autoxray scanner but it dosent show the fuel trim on my scanner. do you guys think my tune got screwed up from welding on the body or something.

1995ta383

I looked at it again and it is going lean in open loop not closed loop. but i still have no idea what it could be.

C_Rules

iTrader: (7)

maybe your wideband 02 sensor is acting up. do you have an innovate unit?

infinitebird

iTrader: (11)

If its just open loop, then yes it could be tuning. The target a/f for open loop is configured in the tune.