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Re: 94 miata wont start
Posted: Tue Jun 15, 2010 8:46 am
by JBT
Check all ignition connections and fuses. Ask a moderator to move this thread to "Engines, Transmissions & Final Drive".
Re: 94 miata wont start
Posted: Wed Jun 16, 2010 12:43 am
by Okibi
Yeah sounds like a coil might be dead, if in doubt swap the coils over and test again.
Re: 94 miata wont start
Posted: Wed Jun 16, 2010 4:55 pm
by manga_blue
There are 2 coils in the coilpack, running under the waste spark method. Driver's side coil fires 1 and 4 simultaneously, passenger side coil fires 2 and 3. So if a coil has gone you'd expect one pair of cylinders to fail, not half of each pair.
If spark is there but weak or varying between cylinders then I'd be checking HT leads and connections first, including polishing down inside the HT plugholes in the coils. In NA8s (93-97 models) there's a chance of damage from rainwater in there.