Lean under load both banks
Lean under load both banks 1999 SS MANUAL
CAR RAN FINE WHEN PARKED 2 YEARS AGO.....
JUST INSTALLED LONG TUBES k&n and SLP air box
sent out for mail order tune ...
runs well but no power after .. fuel trims high... found and replaced split pcv hose and threw a set of intake gaskets at it ...... drove again had questionable 02 sensor ... so just installed 2 new acdelco sensors.....now sensors switch as they should at idle .... but both will drop to zero under load ...also I have swapped ecm pins 68/69 28/29 25/26 65/66 so I can plug sensors into rear connectors
maf is in low 100's under hard accell .... I have another im going to go swap out now .... what am I missing ????
CAR RAN FINE WHEN PARKED 2 YEARS AGO.....
JUST INSTALLED LONG TUBES k&n and SLP air box
sent out for mail order tune ...
runs well but no power after .. fuel trims high... found and replaced split pcv hose and threw a set of intake gaskets at it ...... drove again had questionable 02 sensor ... so just installed 2 new acdelco sensors.....now sensors switch as they should at idle .... but both will drop to zero under load ...also I have swapped ecm pins 68/69 28/29 25/26 65/66 so I can plug sensors into rear connectors
maf is in low 100's under hard accell .... I have another im going to go swap out now .... what am I missing ????
mass air flow was the prob ..... both 02's would read zero under load read fine at idle fuel trim was fine at idle ... did not check going down the road ... runs strong now
