02-15-2019, 02:33 AM
fuel pressure is dynamic on all MPI cars like this, and must be in spec.(the fuel pressure regulators does that and love to fail this old)
the IAC has no wires, like the ISC does, the IAC is open below 150F and that is how cold idle is near 1500 RPM cold. then closes at 150f and the ISC (electric) then takes over, idle control
after IAC goes DEADclosed. the ISC regs at 800RPM (ecu does that) and 1000 if the idle up pin in the ECU is true, (AC on, or rear defrost on, or powersteering detector shows, overload)
so that is new 180F or up to 195F STAT? a not those very evil 150F stats, ok>?
unplugging the maf is not a valid test for any car, and causes limphome mode, is a very rich mode, and limited power.
avoid limphome or burn up the CAT fast. (the ECU will even flash the CEL lamp to tell you , cat is burnning up now>
we test each sensor unplugging them is not wise ever. ( due to limphome, but 02 ensure sure can be unplugged,) O2 is the exception sensor.
what happens when you unplug any o2 sensors
the ECU (PCM) shows DTC for dead 02.
the ECU then warns of lean mix, called trim failures. ( and kills dead the rear cat o2 and the cat tests dead, and fails smog tests just this alone)
the ECU goes rich, if Air fuel ratio was lean.
if Air fuel ratio is already too rich the 02 pulled makes it even more richer, a bad idea)
each sensor can be tested, or replaced.
how you fix a car, EFI depends on tools owned, or thick wallet to my parts guessing
there is no other way.
the IAC has no wires, like the ISC does, the IAC is open below 150F and that is how cold idle is near 1500 RPM cold. then closes at 150f and the ISC (electric) then takes over, idle control
after IAC goes DEADclosed. the ISC regs at 800RPM (ecu does that) and 1000 if the idle up pin in the ECU is true, (AC on, or rear defrost on, or powersteering detector shows, overload)
so that is new 180F or up to 195F STAT? a not those very evil 150F stats, ok>?
unplugging the maf is not a valid test for any car, and causes limphome mode, is a very rich mode, and limited power.
avoid limphome or burn up the CAT fast. (the ECU will even flash the CEL lamp to tell you , cat is burnning up now>
we test each sensor unplugging them is not wise ever. ( due to limphome, but 02 ensure sure can be unplugged,) O2 is the exception sensor.
what happens when you unplug any o2 sensors
the ECU (PCM) shows DTC for dead 02.
the ECU then warns of lean mix, called trim failures. ( and kills dead the rear cat o2 and the cat tests dead, and fails smog tests just this alone)
the ECU goes rich, if Air fuel ratio was lean.
if Air fuel ratio is already too rich the 02 pulled makes it even more richer, a bad idea)
each sensor can be tested, or replaced.
how you fix a car, EFI depends on tools owned, or thick wallet to my parts guessing
there is no other way.
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