weird scan tool numbers...help??

[1985GN]

ok here is the deal before i made a run wiht hte car it had 20psi, good gas, cracked header and a bad MAF that i didnt know about and the BL's were at 105 and i had about 2 degrees of knock every once in a while.. ok i changed the cracked header and put in the new maf and took the car for a run. with 21 psi up top the car now reads 800 on hte 02's, no knock, and the BL's are now around 145?? how is it that im running wiht no knock and all but the car says im running lean wiht hte BL's?? any ideas the thing runs great im not gonna touch it im just curious of i can get it too run even better? thanks again

 

[Jimn8or]

Did you reset the ECM so it can learn the new settings/parts? Don't use someone elses numbers to judge your car...each is unique as there are variables in the O2 sensor accuracy alone that can throw 'weird' numbers at you. Just because you've changed out a part doesn't mean it's working as it should, or installed 100% correct. Is your crossover leaking after the header replacement? The exhaust system has to bo 100% sealed on these cars or your attempting to tune for a leak. BLM's don't lie as a general rule, so check out the possible causes for inaccurate numbers first.
HTH
Jim