2000 4.3 blazer no spark

[d.blair]

I have a 2000 blazer 4x4 with a 4.3 that I just put a motor in, and wasn't that fun, and now its not getting any spark. It wasnt getting a signal from the crank sensor so i look at the plugin and the signal wire was striped a little so i took it apart and reconected all the wires. Then it had an erratic spark at the coil. It still wont start. I tried to start it a few times and now it doesnt have a spark at all. Put a new crank sensor in and nothing changed. It has battery voltage everywhere it should. Good grounds, The Distrubter is in like it should be, It has good fuel pressure. everything seems to be right.
what else might it be???

[MT-2500]

Originally Posted by d.blair

I have a 2000 blazer 4x4 with a 4.3 that I just put a motor in, and wasn't that fun, and now its not getting any spark. It wasnt getting a signal from the crank sensor so i look at the plugin and the signal wire was striped a little so i took it apart and reconected all the wires. Then it had an erratic spark at the coil. It still wont start. I tried to start it a few times and now it doesnt have a spark at all. Put a new crank sensor in and nothing changed. It has battery voltage everywhere it should. Good grounds, The Distrubter is in like it should be, It has good fuel pressure. everything seems to be right.
what else might it be???

Make sure coil is good and ign voltage to it.

Ckeck coil spark right at coil.

Is dist still turning?
Have you got RPM and crankshaft sensor signal to PCM.
Any stored codes?
Also check all fuse for power on both sides and for all engine grounds.