Took me THREE DAYS to find that my coil was bad....
Driving along the freeway -- car just died.... fetch trailer and drag it home.
Immediately order a new ECU -- $650 -- fedexed next day -- arrives Tuesday -- same problem - ie., no run.
"
Rip out MSD box under front seat - fetch new MSD "Digital" box - $300 - install - same problem.
Fire starting fluid in stacks - catches and dies... must have "spark"... so has to be fuel... chase all wires - open wire harness -
twice - trace wires - check fuel pump (works fine - pressure exactly what it should be)
Remove fuel rails - clean - check - look for bad injector issue... no fixie
Take both MSD boxes to parts guy - both work fine... while there I said - Give me a new coil while I'm here - $150....
Install OLD MSD analog box - new coil - fires up and runs like a champ.
NEVER EVER EVER in 40 years had a coil go bad... and this was one of big ol mondo MSD bad boys with the fins etc.
Reason it coughs and dies -- ignition passes 12 v to plugs until you release key to run position.... so with starter fluid - she'd cough giving ME false indication that it was fuel not spark. Lesson learned.
Take back new MSD Digital box - since not using... get store credit.
Now have a "spare" ECU.
Decide I should have the newer Digital box now that problem is fixed - so go use my store credit for new Digital box -- installed it - so now have a spare MSD analog box that I will never use.