12-05-2016, 03:26 AM
this MPI system
works like this
the MAF measures air flow, (mass) into the engine at all times.
the EFI takes that flow and then adds fuel (injection pulse widths) .
The 02 corrects any errors, from above, during idle or light cruise, but not acceleration or wide open throttle.
so vacuum leaks, cause lean. (02 off line)
a bad 02 can be stuck at 0volts. this causes, rich.
an exhaust leak near the 02, cause 0v. same ends.
works like this
the MAF measures air flow, (mass) into the engine at all times.
the EFI takes that flow and then adds fuel (injection pulse widths) .
The 02 corrects any errors, from above, during idle or light cruise, but not acceleration or wide open throttle.
so vacuum leaks, cause lean. (02 off line)
a bad 02 can be stuck at 0volts. this causes, rich.
an exhaust leak near the 02, cause 0v. same ends.
http://www.fixkick.com