sure
the gap is set, to .086"
when you move the throttle stop the tps calibration gap is now wrong.
this was corrected in 1991, .
when you screw the stop in, at at the point you hit the calibration point, the TPS idle switch opens and the ISC goes dead.
that is what the switch does,
so that the ECU does not attempt to fight the drivers right foot.
when you step on the gas (throttle pedal) the switch opens. and idle controls are cancelled.
these 2 years are very hard to set. up right.
when the switch opens,
it start working like carb. then.
idle speed is just random, (air fuel mix, friction, engine efficiency ,etc, dictate speed)
when the switch is closed, the ecu controls air supply, and that controls RPM exactly (hard coded)
on this car its a pain to set up correctly. (well they are , to one degree or the other)
on new cars, the ISC has more control and needs no fiddling.. like this..ever.
on some cars it's a huge stepper motor running a huge air valve. all under ECU control '.
but not this puppy. (like the 96 J18/j20 has or the 1999 GV V6 has)
i call this jump through 2 hoops at once.
in the 2 liter we set the TPS to 0.5v, that it, nothing else to do.
the gap is set, to .086"
when you move the throttle stop the tps calibration gap is now wrong.
this was corrected in 1991, .
when you screw the stop in, at at the point you hit the calibration point, the TPS idle switch opens and the ISC goes dead.
that is what the switch does,
so that the ECU does not attempt to fight the drivers right foot.
when you step on the gas (throttle pedal) the switch opens. and idle controls are cancelled.
these 2 years are very hard to set. up right.
when the switch opens,
it start working like carb. then.
idle speed is just random, (air fuel mix, friction, engine efficiency ,etc, dictate speed)
when the switch is closed, the ecu controls air supply, and that controls RPM exactly (hard coded)
on this car its a pain to set up correctly. (well they are , to one degree or the other)
on new cars, the ISC has more control and needs no fiddling.. like this..ever.
on some cars it's a huge stepper motor running a huge air valve. all under ECU control '.
but not this puppy. (like the 96 J18/j20 has or the 1999 GV V6 has)
i call this jump through 2 hoops at once.
in the 2 liter we set the TPS to 0.5v, that it, nothing else to do.
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