Between Omaha and Des Moines, 7 miles South of I80 | Are you sure it is a 3176 engine, and not a C-10 or C-12 engine? (1996 is a little late, for a 3176 engine, in a truck) If a 3176 engine; I'm wondering about the RPM/Timing sensor, that is in the front cover, pointing towards the cam gear. The older style, had a "sliding" sensor tip. If the tip was just a little too far away, then it would have a hard time "sensing" a RPM signal/speed, BUT if you gave the engine some ether = it now, spins faster and the signal to that sensor becomes stronger = the ECM might be able to read RPMs while the engine is getting "ethered", but can't read rpms at slower "normal cranking speed". Edit: Have you clean battery connections?
Edited by 4WD 10/13/2014 07:58
 (3176 engine.jpg)
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 3176 engine.jpg (98KB - 748 downloads)
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cat 3176 crank but no start
