Some info. about PCM under WOT.
This applies to the 97 PCM ... can't speak for other years.
The PCM operates in 2 different modes: Open Loop and Closed Loop.
During Open Loop modes, the PCM receives inputs and responds according
to "preset PCM programming". Input for O2S is not monitored during
Loop Modes.
During Closed Loop modes, PCM monitors O2S input. This input indicates
to the PCM whether or not the calculated injector pulse width results
in the ideal air-fuel ratio (14.7 to 1). By monitoring the exhaust oxygen
content via the O2S, the PCM fine tunes the injector pulse width.
The fuel injection system has the following modes of operation:
Open Modes: Ignition switch ON
Engine start-up (crank)
Engine warm-up
Acceleration
Deceleration
WOT <==================ignores O2S and provides a
predetermined amt of extra fuel
Ignition switch OFF
Closed Modes: Idle
Cruise
PCM inputs under WOT:
Battery voltage
Crankshaft position sensor
Engine coolant temperature sensor
Intake manifold air temperature sensor
MAP sensor
TPS
Camshaft position sensor signal
Bob
Burlington, Ontario, Canada
tigers@bserv.com
Current: '97 CC Sport, 5.2L, 3,55 auto., Gibson dual, K&N filter element.
'85 Shelby Turbo Charger, 2.2L, manual.
'70 Challenger, 383-4bbl, auto.
Past: '71 Road Runner, 340-4bbl, auto.
'70 Duster 340, auto.
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 12:10:51 EDT