01-11-2018, 05:23 AM
89 is not like and 91 and nwwer.
you need to read only 89/90 pages.
yes to all that above
are you going to use some off the shelf tacho.
bTW I have no 89 scope data at all , the spark all happens inside the distributor that year.
the ECU only watches it to see if the spark failed, so cuts fuel instantly
the ECu dose NOT advance spark at all here.
your ECU is 100% fuel only ECU.
but does monitor spark and reports it bad (DTC errors and does cut fuel preventing crash and burn by law it must do that here)
why not just use the neg coil lug minus
like old days , for points ignition, a good OTC tach willl clamp that huge spike and use it, (back EMF spike from when the ignitor goes from closed to open)
you need to read only 89/90 pages.
yes to all that above
are you going to use some off the shelf tacho.
bTW I have no 89 scope data at all , the spark all happens inside the distributor that year.
the ECU only watches it to see if the spark failed, so cuts fuel instantly
the ECu dose NOT advance spark at all here.
your ECU is 100% fuel only ECU.
but does monitor spark and reports it bad (DTC errors and does cut fuel preventing crash and burn by law it must do that here)
why not just use the neg coil lug minus
like old days , for points ignition, a good OTC tach willl clamp that huge spike and use it, (back EMF spike from when the ignitor goes from closed to open)
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