Hi Pringles,
Thankyou for your time.
Yeah, between the Corsair FSM and the Gregorys manual that came with the car, the ignition system
seems simple enough.
With the prospect of some overtime in this week's pay, I engaged in a fit of expenditure at Pick-A-Part wrecking in Campbellfield. A colleague of mine had spotted a Corsair there and the Pick-A-Part website still listed it.
Just a few weeks ago there had been a couple of Pintaras at DIY Auto Parts in Camp Road Broadmeadows, A Pinty T manual and an Exec auto, but those have apparently now gone. Jeez you have to be quick.
Some Melbournites may think of DIY Auto Parts as the wrecker formerly known as Andy's Autos.
Anyway, I scored a dizzy and whole coil/power transistor assembly. I like the way the whole lump comes of with 2 bolts and 1 connector.
It was reasonable weather to burn a log book day on the club rego'd bike but curiosity got the better of me and once again I lifted to bonnet of the 50-Shades-of-Brown Pintara, this time to swap out the coil/PTU assembly.
I now have spark on the exhaust side plugs.
Howevar, I'm still not happy.
Using the timing light, the intake plugs fire as expected. The exhaust plugs fire way too fast, pretty much like having the timing light pickup on the coil lead. There seems to be some serious crossfire going on with the exhaust side. That should not happen with new a Bosch rotor and cap, unless the wobble in the dizzy shaft is a factor.
Admittedly all the leads are factory and may well be the original parts out the factory door 28 years ago. I have some spare leads sitting around so I'll give those a shot next time I get around to it.
I don't see any difference in timing between intake and exhaust, before or after the coil/PTU swap.
The spark out of the coil leads seems sort of ok. The spark is orange out of both coils and can stretch out to at least 10mm. I expect a bit better out of electronic triggered ignition. The spark out of my Z31 is blue and can easily stretch out to about 12mm, and that is a single coil feeding a 6 cylinder distributor.
So the old exhaust side Mitsubishi J121 Power Transistor is suspect, which is no surprise since I've seen similar J119's fail in first gen Mazda rotarys.
At least now I have a spare known good J121 and coil.
Also, it is easy to overlook the 2 condensers on the coils/PTU assembly which could be dubious. (Condensers? With electronic ignition? Sheesh.)
I'll have to figure out a way to test the condensers.