Anyone have hard info on whether the ECU might cut spark to the rear rotor, and, if so, when?



My project TII suddenly started running on 1 rotor, and I have checked all the obvious stuff, (including power to coils, fuel and compression). Verified spark only to front leading plug with a timing light.



https://www.nopistons.com/forums/pub...1047683561.gif

You may have a bad coil. My rear coil started shorting out on me a while back. It turned out to be a bad coil.

the same coil provides leading spark for front and rear rotors, and the front rotor is sparking fine (and the coil has tested fine)

smoking alot?? if it smells like gas out the tail pipe then your fuel injectors are probably working fine. ignition is about the only thing that could do that

fouled plug?? if it's just running on trailing in the rear then it would be very weak.



swap plugs and plug wires (keep the plug and plug wires together) swap on coil as well to check.

pull out the plug and (with an insulated glove) touch the side of the plug to the body and have someone crank it to find out for sure.

yep, like i said, i have fuel and compression

the plugs are clean, the wires are in spec, and the leading coil is fine. the timing light is showing a spark -only- on the front leading plug, so it seems like a signal issue to me, which is why i'm sniffing towards the ECU..

the dead rotor lit up again after i swapped out the tested-to-be-in-spec OEM wires for a set of Jacobs i had on hand. https://www.nopistons.com/forums/pub...IR#>/blink.png



ah well it runs and goes like.. something really fast https://www.nopistons.com/forums/pub...1047683473.gif



thanks for the suggestions, guys

good to hear