sorry, no , its not any kind of reset at all.
no math. answer (redux)
I can answer 10 ways,,, this is way2.
the ECU does 3 major things.
controls fuel..
controls spark creation and advance. (using tables)
controls idle (isc & a ECU loop)
think like its 3 computers, there. (it's really multitasking)
The freeze jumper just prevents table advance, it freezes the spark at 0 advance, so only the static set distributor advance is all the advance there is.
take your timing light at idle, see spark timing bounce like crazy (it does that to save fuel, and burn it efficiently)
you can not set spark timing when it bounces like that, see? its impossible. (like changing a flat tire on a moving car, impossible)
so suzuki added a jumper pin, to stop that bounce. ergo, timing freeze.
the spark computer, creates spark and times it perfectly at all RPMs' and engine loads. (this magic part is just a spark table.)
on old cars with no computers the Distributor has mechanical, vacuum advance plus centrifugal fly weights inside that advance spark timing,
not today, in 1991, Suzuki added that big job to ECU brain.
all this is covered here,
http://www.useasydocs.com/theory/basictuning.htm
the table looks like this.
this the left axis is engine load ,the bottom is RPM and the table numbers are spark advance, notice how none are 0.
![[Image: ms3x_ignition_table_1.gif]](http://www.aaroncake.net/rx-7/megasquirt/ms3x_ignition_table_1.gif)
when you insert the timing freeze jumper, to calirbate the distributor base static advance, all those numbers go to zero
or on suzuki only 800 column goes to 0. (that is why the FSM books says set it only hot and 800 rpm !)
at zero the mech can set timing, and there is no other way, exact to do so, fuel pump relay removed. (ask)
now if the ISC is busted, there will be no 800 rpm (rpm is out of control)
now if the TPS idle switch is mis-adjusted, there will be no ISC controls and idle again is out of control.
as is limphome mode, and all things listed on my why is spark timing bouncing... on timing set page. below.
the steps are clear see here.
the 5 steps here.
http://www.fixkick.com/IGN_timing/16v-procedure.html
see that, ?
see step 3, if the idle switch is dead, the ISC will be dead, and 800 RPM will not work.
i cant answer if your mech, went to school or even if his school even covered 1990s cars.??????
on today's cars this is ALL GONE. (ask)
no math. answer (redux)
I can answer 10 ways,,, this is way2.
the ECU does 3 major things.
controls fuel..
controls spark creation and advance. (using tables)
controls idle (isc & a ECU loop)
think like its 3 computers, there. (it's really multitasking)
The freeze jumper just prevents table advance, it freezes the spark at 0 advance, so only the static set distributor advance is all the advance there is.
take your timing light at idle, see spark timing bounce like crazy (it does that to save fuel, and burn it efficiently)
you can not set spark timing when it bounces like that, see? its impossible. (like changing a flat tire on a moving car, impossible)
so suzuki added a jumper pin, to stop that bounce. ergo, timing freeze.
the spark computer, creates spark and times it perfectly at all RPMs' and engine loads. (this magic part is just a spark table.)
on old cars with no computers the Distributor has mechanical, vacuum advance plus centrifugal fly weights inside that advance spark timing,
not today, in 1991, Suzuki added that big job to ECU brain.
all this is covered here,
http://www.useasydocs.com/theory/basictuning.htm
the table looks like this.
this the left axis is engine load ,the bottom is RPM and the table numbers are spark advance, notice how none are 0.
when you insert the timing freeze jumper, to calirbate the distributor base static advance, all those numbers go to zero
or on suzuki only 800 column goes to 0. (that is why the FSM books says set it only hot and 800 rpm !)
at zero the mech can set timing, and there is no other way, exact to do so, fuel pump relay removed. (ask)
now if the ISC is busted, there will be no 800 rpm (rpm is out of control)
now if the TPS idle switch is mis-adjusted, there will be no ISC controls and idle again is out of control.
as is limphome mode, and all things listed on my why is spark timing bouncing... on timing set page. below.
the steps are clear see here.
the 5 steps here.
http://www.fixkick.com/IGN_timing/16v-procedure.html
see that, ?
see step 3, if the idle switch is dead, the ISC will be dead, and 800 RPM will not work.
i cant answer if your mech, went to school or even if his school even covered 1990s cars.??????
on today's cars this is ALL GONE. (ask)
http://www.fixkick.com