Aftermarket alarm on the truck??

 

Nope, it's the stock alarm and security system. Just a question though, do you think an ignition coil would have anything to do with that? Losing voltage after it starts?

 

Coil, and injectors get their power from the ASD relay. If you have power at one, but not the other, it's a wiring problem. If you don't have power at either of them, then its a relay, or relay control circuit problem.

 

So it's not an ignition coil problem. And it's got no problem with fuel pressure, maintaining 48 I think, priming and idling. So I think it might be a security issue, something is shutting the truck off, it's getting fuel and air, what do you think?

 

Gonna have to go looking for what's missing when it quits..... If it stays quitted for long enough.....

 

So the next thing we are going to try is bypassing the oil pressure sensor, because I've read that those could cause similar problems. Thoughts?

 

Oil pressure sensor? Nope. Has nothing to do with whether the engine wants to run, or not.

 

Okay. What about an oxygen sensor or MAF sensor?

 

If it doesn't fire at all, even on starting fluid, you need to look at why you aren't getting spark.

 

I'm gonna try to bypass my O2 sensor, see if that does anything.