fix the exhaust leak that is causing your lean code and your pcm is compensating by adding fuel to engine when it really doesnt need it

 

btw nothing really stands out as abnormal on your snapshot but i am not too familiar with the datamaster i usually use the gm tech 2 that i have at the dealership i work at .dont know why it is showing knock counts though does that number increase at idle or only when you are driving and does that start at zero when car is first started? also lt fuel trim a little high but that is due to exhaust leak

 

the knock count never seems to change, and it starts out that high, i think its the same everytime and doesnt seem to go higher. i really dont like datamaster and my trial is up, so im using efilive now. im not actually doing any tuning. i bought my aldl cable just for pulling codes, but my car never had a single code except when the opti failed i got a dtc16.
i just tightened up the back 2 exhaust bolts and the leak is alot better but i think theres a leak at the collector. i really dont see how this small of a leak is going to make my idle that low. im going to attempt to do the gasket later today. hopefully i dont have a crack in my manifold, i do have a extra one. im wondering if i can undo the manifold just at the head and slip in a new gasket or am i going to have to un bolt the collector and remove the starter??

 

the exhaust leak actually allows air into exhaust and that is picked up by o2 sensors as a lean mixture when engine is actually not running lean the pcm then commands more fuel to compensate which gives you a rich condition

 

btw you shoulb be able to just unbolt the man at the head and change the gasket just make sure there is no debris or gasket material stuck to head or man

 

good deal im getting started on it soon as the car cools off

 

if that doesnt fix it let me know ill try to help you figure it out

 

i got caught up playing with my turbo car so hopefully tomorrow ill get it done. i have the day off so its gotta get done then. after working on cars all day the last thing i wanna do is mess with my own