hi, i've got a 350 out of an 88 iroc that i put into my 84 cadillac. now what i did was hook up the DFI system from the cadillac onto the 350 intake, and used all the ECM and wiring/sensors. Engine runs fine with no codes, but it has a slight misfire from both banks, i've replaced every ignition component with known good ones, from dist. to plugs LOL. I used the smaller hei chevy distributor and wired it to the caddy distributor harness. now, the chevy is timed at 0 degress, where the caddy engine is timed at 10 degrees. would you think that the ignition module would be able to control the timing properly? wondering if this may be my slight misfire issue or could it be valve adjustment. I know its a bit of an abstract question, but I'm an adventerous mechanic haha!

 

Have no idea
but on the TPI engines for example
the initial ( static ) dist advance must match what is programmed into the tune because the computer adds it's spark advance to that setting to get total programmed advance

Which to me means your Chevy dist needs to be at whatever advance the Caddy system needs
because the computer has no idea you changed the name on the rocker covers;
for all it knows it is still controlling a Caddy engine

 

ya, kinda was thinking the same thing. the tpi engines have the same concept as the TBI chev and caddy systems. so at any given time, my engine is most likely running 10 degrees out. maybe less, depending on the parameters of the caddy chip. no timing clatter out of the engine but that really doesn't mean anything. may have to wire in a chevy ecm to make this kitten purr lol. oh the fun LOL