4,3gi throttle body injection
been having a number of issues. i believe i have it pinned down to ignition at this point. after replacing injectors, fuel regulator, plugs cap and rotor, i was able to get it running very rough with backfire at intake. was acting like timing was squirrelly. could barely keep it going for 30 seconds or so before it would die out. VERY rough slow burping idle
replaced ICM hoping that was the issue but now i can no longer get it to fire at all, just cranks with no joy.
i have spark. i have good compression. rotor is pointed at cylinder 1.
been reading a number of threads on the internet about needing to set base timing, but getting confused as to needing shunt at module vs paperclip at the diagnostic plug. in any event, both scenarios seem to require an engine at idle to perform those steps. ive found a few threads with good information on here that offer links to other threads & more detailed instructions, but those links all seem to come up dead or pointing to unrelated threads.
any/all help is welcome. ive been throwing parts at this for a while now and local marine mechanic has been unable to solve- their last suggestion in the fall was that it was my injectors which have now been replaced and led to the current ignition diagnosis.
been having a number of issues. i believe i have it pinned down to ignition at this point. after replacing injectors, fuel regulator, plugs cap and rotor, i was able to get it running very rough with backfire at intake. was acting like timing was squirrelly. could barely keep it going for 30 seconds or so before it would die out. VERY rough slow burping idle
replaced ICM hoping that was the issue but now i can no longer get it to fire at all, just cranks with no joy.
i have spark. i have good compression. rotor is pointed at cylinder 1.
been reading a number of threads on the internet about needing to set base timing, but getting confused as to needing shunt at module vs paperclip at the diagnostic plug. in any event, both scenarios seem to require an engine at idle to perform those steps. ive found a few threads with good information on here that offer links to other threads & more detailed instructions, but those links all seem to come up dead or pointing to unrelated threads.
any/all help is welcome. ive been throwing parts at this for a while now and local marine mechanic has been unable to solve- their last suggestion in the fall was that it was my injectors which have now been replaced and led to the current ignition diagnosis.