Small Block & Big Block Chevy Specific - lost crank signal

i have been working on a fuel injected 526cu in bbc in a 55 210 with a 2002 ls1 ecm. The motor was running and then all of a sudden it lost the crank signal. I changed the sensor with no results. I'm using hp tuners software to look at all the signals.. I replacd the 3 wires to the sensor, the connector and verified the ecm conector. Nada.... I also replaced the ecm with a 2003 ls1 ecm..... drew a blank... no dct's ..... I did however, install a led to confirm there is a pulse going to the ecm...... does the theft deturrant disable the crank signal? I'm at the point.... can you say carb???? Any info will be greatly appreciated .....

"then all of a sudden it lost the crank signal."

How long did it run before it lost it? Where are you getting the cam position signal?

Al 95 Z28

it was idling about 5 min while i was charging the ac. ... then it started missing and quit.... good question about the cam sensor.... i'll check it out... thanks

it was idling about 5 min while i was charging the ac. ... then it started missing and quit.... good question about the cam sensor.... i'll check it out... thanks

Are you saying the total time it ran was 5 minutes?

Al 95 Z28