This might be an easy fix, but I’m lost.
I just changed from a TH-350 to a M20. I removed all the linkage and plugged the vacuum lines ect., I also replaced the gauges, replaced brake lines, and cleaned up years of bad wiring by prior owners. So basically, I’ve done quite a bit to it both mechanically and electrically since it was last on the road.
Last night, I finally put everything back together, and it would not start, it turned over but was a no go. I chased this problem to no switched power going to the coil. Easy fix for that, and it started right up. I was a little rough but it had not run in a couple of months. The engine has always had a little backfire through the carb and I was going to tackle that next. When it ran last night, it backfired a couple of times, but it did start and run somewhat smoothly eventhough it was cold.. I did not drive it at the time or let it run for very long.
This morning, I went to work on it and would not start, then when it started it sounded like something was hitting the fan (nothing was hitting the fan but that was the sound) clunk, clunk, clunk. It sounds like the timing is way off or it is detonating. Also the engine would not turn off with the key and I needed to pull the coil power wire. I checked and rechecked the switched coil wire power and it only has power when the accessory switch is on, but it turns off when I pull the coil power wire from the fuse box.
Before the switch it ran like a champ (except for the back fire when accelerating very slowly from a stop). And like I said it ran last night, then this morning I have the problem with it starting, loud clunk from the engine when it did start, and not turning off unless I pull the wire to the coil from the fuse box.
No plug wires have been switch and all are tight. Timing has not been changed from when it was last running.
I will take any help on where to start looking. I have checked all of the wiring and it appears that everything is correct.
Is it possible that the carb now needs to be ajusted, or the timing changed on it own?
It a small block 350 with camal hump heads, more than mild cam, m-20, MSD dist.