Hi OldColt, thanks for sharing your experience (your 3.8 Mivec build is awesome, I've been watching it on ExPo).

(From a newbie) How would you test an ignition coil? I'm aware of testing resistance of the primary and secondary circuit, using a HEI spark tester (eg. OTC 6589), and using an adjustable spark tester (e.g. Lisle 50850, since spark in atmospheric pressure and air mixture performs differently than under cylinder pressure and ICE air/fuel mixture). Also, do you have a reference you could recommend for learning automotive electrical diagnosis? I've been learning about voltage drop testing (test lights (incandescent and LED), LoadPro, carbon-pile load tester for big loads, etc.), pressure transducers with scopes (for finding mechanical engine timing, under-performing valve springs, worn cam lobes, etc.), and similar fun stuff piece-meal, but would love to have a big reference book for that stuff.

For reference, here are the resistance specs I found for an aftermarket ignition coil on RockAuto (for 91 Montero 3.0L): Primary 0.4 - 1.2 Ohms, Secondary 8.5k - 18.5k Ohms (from https://www.rockauto.com/en/moreinfo.php?pk=942701&cc=1207684&jsn=810)