Hi,
I've been experiencing an "intermittent" problem with OD on the track :-(
I set OD to OFF with the OD ON/OFF switch at the end of the gear
shifter. I use 1-2 5200 and 2-3 5500 shift points when bracket racing.
If the problem does not occur, the Dak will cross the 1/4 mi. line at
around 5700 rpm. When OD comes on by itself, it always happens
just past the 1000' marker when in 3rd gear and revs approaching
around 5300. When this happens, rpm drop to 4000 and I might as
well put my dial up on a minivan :-)
The FSM says that the wire from the OD ON/OFF switch to the computer
"toggles" a memory location which the computer reads as OD ENGAGE
or OD DISENGAGE. The computer monitors this location and, if it sees
OD ENGAGE and some other inputs are met, it energizes the OD solenoid
in the tranny via another wire from the computer. If it sees OD DISENGAGE,
the solenoid cannot be energized and therefore no overdrive.
My question is: Are there any "fail safe" inputs that the computer monitors
that will activate overdrive and override the OD DISENGAGE "mode".
I haven't been able to anything on this :-(
Because the problem is intermittent in nature (and assuming for the moment
it is an electronic/wiring problem and not a "mechanical/hydraulic" one),
I've been thinking of putting in a switch so that I can manually control
when OD will come on.
The first possibility that I thought of was to put manually control the
wire that energizes the solenoid. The problem that I see with this is that
with OD engaged, the computer goes through a sequence where
the torque converter is unlocked, OD solenoid is energized and then
the torque converter is locked up again.
The other possibility is the wire from the OD switch. This way I can
set OD to OFF the normal way, manually interrupt this circuit so no
further pulse signal can be sent to the computer and thus leaving
the computer in the "OD DISENGAGE mode". Unless, the computer
looks at other "fail safe" inputs and overrides it :-(
I am careful not to hit the switch during the race. OD operates
perfectly on the streets/highways and about 50% of the time on the track.
Sorry for the length and the complexity of the query, especially being
so close to BBQ time :-)
Bob
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