Hopefully someone else has come across this issue. I have a problem with the PCM commanding ~80 degrees timing while cranking (verified with a timing light and the fuel shut off). Engine is very hard to start and does give my mini starter a workout. After the engine does start, it runs great! Timing is dead on to what the PCM is commanding (verified with a timing light as well). Cam/Crank correlation is withing limits. I have played with B5909 & B5915 with no luck. I have triple checked the wiring as well with no ideas.
383_COS5_Start Issue.ctz
383 internal balance L31 Vortec
Mercruiser MPFI ported, 27lb injectors, ported throttle body
Iron 64cc vortec ported and polished
Comp Cams Beehive springs for 0.550 lift, Crane gold rockers 1.5 Camshaft:Comp Cams XFI 280 hydraulic roller, Comp Cams Magnum hydraulic rollers