Ok, the coil circuit is good, and the PCM is controller it, if you still don't have spark, somethings up with the coil.

Since you have power at the coil, and injectors, ASD relay is doing its job.

If the injectors are not pulsing, the the cam position sensor (under the distributor cap) is not doing its job.

 

Just put my coil in a running truck and it ran fine. Took the coil out of the running truck and nothing. Why would the truck run perfect and get parked then never show any signs of life again. Completely lost. Would the bad cam sensor cause no spark to

 

Another thing. My truck was like pulsing and every time I took off it would sort of cut out. And when it was idling it would start dropping rpms and most of the time die. Sitting in traffic I would have to hold the gas down. When I would accelerate up to 3000 or higher it would sometimes cut out and blow a puff of black smoke. So I thought my crank shaft position sensor was going bad again. So I ordered a new one but the truck wont start up again so I cant even see if that was the cause of that problem. But now thinking of all that I'm wondering if the cam sensor didn't go bad...... And wasn't going bad and now its just quit. The wires all test out but how could I check the sensor? Can it cause a no spark by not letting the computer know where the pistons and valves are? Thanks.

 

I don't *think* the cam sensor will cause a no spark..... but, given some of your previous troubleshooting, the PCM is indeed controlling the coil. Why you aren't getting any spark out of it is a mystery to me.

 

I'm completely lost to. Especially since I've taking out most electrical components out of my truck and put in another truck and it's ran fine. I tested the crank and cam sensor today. The test where you crank the motor by hand while the sensors signal wire is probed and wait to see if the sensor drops from 5 to 0 volts. And of course both sensors did what there supposed to. The night that I parked it when it was running it somehow popped out of gear in my driveway and coasted back and hit my building. It kinked one my exhaust pipes but I cut it off and there's not even any wires on that side of the truck. I looked up by the headers to see if it could've pinched a wire there but I haven't found anything!!! I've looked for broken or melted wires inside where my radio goes. Stuck my hole arm in there just trying to feel for anything broken. I don't get it. How can my coil get power and signal but not let spark through. But then that same coil works on another truck. How can my Cam sensor work but not tell my injectors to inject. Everything checks out. Power to PCM. Ground to PCM. Power and signal to coil. Power, signal, and ground to Crankshaft and camshaft position sensors. Power and ground to all relays and fuse. Power and signal to injectors. Power to fuel pump. All lights still work. Door locks, windows, wipers, turn signals, brake and headlights. Starer is only 3 weeks old. Battery is 2 months old. Fuel to the rails. I think it measured 48psi. Distributor button, cap, and wires have all been swapped. I don't know I've tried everything I know and checked everything online says. I'm out of options here.

 

How are you testing your coil for spark?

 

I just checked for signal from the pcm and 12 volts power when cranking. Haven't tested resistance or anything on coil. But I did test a known working coil from a running truck and nothing. I also took the coil on my non running truck and it ran on another truck.

 

I may be wrong, but my understanding is that a bad ASD will not prevent you from getting power to the coil or injectors, but WILL prevent the injectors from pulsing and will also prevent the coil from sending spark to the distributor. I know from replacing my ignition system that a low voltage signal is "kicked back" through the coil input wires and that our trucks require this "kick back" signal to allow the injectors to pulse.

A bad ASD would certainly explain your injectors not pulsing and no spark at the plugs. If you haven't tried replacing it, I would.

 

Replaced it. Bypassed it. Took one from a running truck. Tried mine in a different truck and it worked. Tested wires an another truck and then on mine and there all the same. Meaning if the running truck has 12 volts here mine does to. Or if the running truck has gound here my truck has ground in the same spot. Still can't find anything wrong. Good thing my other dodge is still going strong because it looks like this one might be toast. Funny how a truck with 280,000 miles is still going with the original motor but one with 136,000 is dead. Guess it's all about the previous owners as well

 

Grab a spare spark plug, unplug the coil wire from the distributor cap, plug the spark plug into it, and then ground it somewhere. (I will just put it on the valve cover, or intake manifold, and then hold it in place with a screwdriver with a PLASTIC handle. the coil can HURT. )

See if it will fire the plug.