94 YJ no spark at the coil and none of the injectors are firing crank (cam sensors test good)

[Scarry D]

I blew my engine up a while ago shipped it off to be rebuilt while that was going on I decided to fix some melted wiring harness that took place in the loom back of the engine on the firewall. I have finally gotten my engine back and everything's ready to go so I tried thinking it over a couple times but realized I was getting no spark from the coil and my injectors weren't firing I didn't want to keep cranking on this thing do the fact that I have a new flat topic Cam that has not been broken in yet. Now I have tested the cam positioning sensor and the crank positioning sensor are both testing good according to the 94 Factory service manual now I'm trying to figure out what to check next there are no codes thrown so I have no information there the gauges are working and I've replaced the fusible links so I believe I can rule that out. Anyone have a suggestion of what to try next?
tomorrow I'm going to check and see if the O2 sensor is Heating I see it shares some wires with the crank and cam positioning sensor along with the speed sensor.

 

[Chris]

I blew my engine up a while ago shipped it off to be rebuilt while that was going on I decided to fix some melted wiring harness that took place in the loom back of the engine on the firewall. I have finally gotten my engine back and everything's ready to go so I tried thinking it over a couple times but realized I was getting no spark from the coil and my injectors weren't firing I didn't want to keep cranking on this thing do the fact that I have a new flat topic Cam that has not been broken in yet. Now I have tested the cam positioning sensor and the crank positioning sensor are both testing good according to the 94 Factory service manual now I'm trying to figure out what to check next there are no codes thrown so I have no information there the gauges are working and I've replaced the fusible links so I believe I can rule that out. Anyone have a suggestion of what to try next?
tomorrow I'm going to check and see if the O2 sensor is Heating I see it shares some wires with the crank and cam positioning sensor along with the speed sensor.

Double-check the connections at the ignition coil, the distributor (if applicable), and the plugs/wires. A loose connection could prevent spark. Also, if you haven't already, try replacing the ignition coil, as even a good-looking coil can still fail.

Use a multimeter to check for power at the ignition coil and fuel injectors. If there's no power, you might have an issue with the PCM (Powertrain Control Module) or a wiring problem somewhere.

Ensure all your PCM ground connections are solid, as poor grounds can lead to all sorts of electrical gremlins. There should be a few ground points on the engine and near the battery; make sure they're clean and secure.

Make sure your fuel pump is functioning properly, and check the relay for the fuel pump. A faulty fuel pump can prevent the injectors from firing as well.

Since you fixed some wiring, it's possible there could still be a short somewhere in the harness you repaired. Carefully inspect for any pinched wires or bare spots that could cause issues.

As you mentioned, checking the O2 sensor is a good idea since it can affect the engine's ability to start if there are issues with its circuit. If the O2 sensor is malfunctioning, it may cause the PCM to act up.

Ensure that your battery is fully charged and providing the proper voltage. A weak battery can lead to a no start situation.

Keep us updated with what you find, and good luck! You’ll get it sorted!