I have a crank no start issue with my 04 blazer. Have changed starter, distributor, plugs, wires, ignition control module among other things.
Any help would be greatly appreciated
Update. I had 2 plug wires backwards when I changed them the other day. I have it running now.

 

There is a pretty thorough Crank/N0 Start troubleshooting thread on the forum.

This is a list of really good help articles. https://blazerforum.com/forum/tech-a...e-first-30093/
On this page look for "Crank" and you'll find these that should help:
https://blazerforum.com/forum/tech-a...not-run-37897/
https://blazerforum.com/forum/tech-a...anks-ok-45942/

Two things to start with are if you have any OBD codes to help with the diagnosis and do you have fuel pressure?
https://blazerforum.com/forum/tech-a...agnosis-23038/

 

I found out earlier that I have no spark at the coil. I'm going to change it out tomorrow, and I'll be back with an update

 

First cut the problem in half. Is it spark/timing or fuel.

George

 

Make sure to change out both the ignition coil and ignition control module. If that don't help then pull the fuses your main max buss fuses from underhood fuse box. Even if they look fine and not blown. Over time they build up a residue / corrosion Make sure that they're shiny if not clean them with a high grit sandpaper like 600 just to knock the funk off. That was my problem getting no spark. Hope this helps.

 

Measure at the ignition power to the ICM with a DC voltmeter, it MUST be either battery voltage while cranking (11.5 ish or more) or about 14.5 running else the module might not work. That old wiring is probably bad, I had to bypass it in both my 78 Blazer and 95 S10 with the old "headlight relay bypass" trick. These ignition systems need at least 14 Volts to operate correctly, else the spark power drops severely.