hey guys,
im at the finishing stages of my m50 swap and it wont start.
Background:
Engine is a '92 non vanos out of a 325. the engine came out of my brothers car which ran great until he started getting low compression. Turns out one of the valves had hit a piston so there was a crack in the piston and a bent valve. We had another m50 lying around with unknown history so i took the bottom end off that and used the head off my brothers engine. lapped the valves and replaced 2 valves. put in new seals and gaskets and put it all together. I did not have the timing tools but i tensioned the chain with the origional tensioner, placed cylinder 1 at TDC, and the cams pointing at each other with the square ends perfectly perpendicular.
engine turns over smoothly without the plugs in. i have fuel and spark. all ignition coils have been tested individualy and are functional. But when i try to turn it over with the plugs in, it chugs and sputters and backfires but doesnt want to go. it had a few close calls where it fired for half a second then died. it doenst sund healthy and doesnt crank smoothly with the plugs in.
the wiring harness is also off my brothers car which was functional and he labeled everything before giving it to me.
im using the akg harness adapter
its got a new crank sensor
im starting to think its a timing issue? would a bad cam sensor cause this?
thoughts?
thanks
im at the finishing stages of my m50 swap and it wont start.
Background:
Engine is a '92 non vanos out of a 325. the engine came out of my brothers car which ran great until he started getting low compression. Turns out one of the valves had hit a piston so there was a crack in the piston and a bent valve. We had another m50 lying around with unknown history so i took the bottom end off that and used the head off my brothers engine. lapped the valves and replaced 2 valves. put in new seals and gaskets and put it all together. I did not have the timing tools but i tensioned the chain with the origional tensioner, placed cylinder 1 at TDC, and the cams pointing at each other with the square ends perfectly perpendicular.
engine turns over smoothly without the plugs in. i have fuel and spark. all ignition coils have been tested individualy and are functional. But when i try to turn it over with the plugs in, it chugs and sputters and backfires but doesnt want to go. it had a few close calls where it fired for half a second then died. it doenst sund healthy and doesnt crank smoothly with the plugs in.
the wiring harness is also off my brothers car which was functional and he labeled everything before giving it to me.
im using the akg harness adapter
its got a new crank sensor
im starting to think its a timing issue? would a bad cam sensor cause this?
thoughts?
thanks
Comment