11-12-2020, 05:06 AM
It has new plugs, wires, cap and rotor within the last year. fuel pressure is around 45psi,
compression is mid 170s on all cylinders,
Fuel pressure reg is new and tested working and not sucking fuel through the vacuum line into the intake, I did notice the #4 manifold pipe is cracked. I didn’t realize the cracked manifold would suck in air and mess up the o2 sensor. I’ve unplugged the o2 sensor and drive for a while but didn’t notice much difference. Maybe I’ll try that for a full tank of fuel and see if the mileage changes.
the the scan tool will show closed loop at idle
and same at steady right foot cruise say 45mph.
must do that O2 present sure. and O2 must swing or it will suck fuel.
the Exhaust PUTT sends out a huge pressure putt this hot gas cools fast and goes to a vacuum just after the putt.
and sucks in 20 % AIR O2 gase from air and hits the o2 sensor and it goes mad, to 0v. and can change at the crack gets larger and smaller as you drive.
45psi, keyon only or at idle.
compression is mid 170s on all cylinders,
Fuel pressure reg is new and tested working and not sucking fuel through the vacuum line into the intake, I did notice the #4 manifold pipe is cracked. I didn’t realize the cracked manifold would suck in air and mess up the o2 sensor. I’ve unplugged the o2 sensor and drive for a while but didn’t notice much difference. Maybe I’ll try that for a full tank of fuel and see if the mileage changes.
the the scan tool will show closed loop at idle
and same at steady right foot cruise say 45mph.
must do that O2 present sure. and O2 must swing or it will suck fuel.
the Exhaust PUTT sends out a huge pressure putt this hot gas cools fast and goes to a vacuum just after the putt.
and sucks in 20 % AIR O2 gase from air and hits the o2 sensor and it goes mad, to 0v. and can change at the crack gets larger and smaller as you drive.
45psi, keyon only or at idle.
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