Everything about this ordeal is odd lol. Yes im getting spark to the cap but not from it. I noticed earlier i wasn't getting an rpm reading either while cranking I pinned the connector for the crank sensor and at the computer and I'm getting the correct 5v reading so idk. I even swapped pcm with one I had in the garage and no change. But yes I'm going to go get a good cap with brass contacts now to be safe

 

ok here's an update....finally got spark coming from the cap to the plugs but still no start and no codes I'm so tired of this truck.

 

Getting injector pulse? You can *rent* (get your money back when you return them) noid lights from your local auto parts store.

 

yes I've got injector Pulse. Quick question.....when I pinned the coil pickup and the crank sensor pin while cranking the coil pickup read all the up to 5.2 volts but the crank sensor was only getting up to 2 volts at best. Even with those readings it's still firing......isn't that low on the crank sensor and if so would it have anything to do with what's going on?
forgot to say it is a Brand new crank sensor

 

Yeah, low voltage will indeed have an impact on engine performance. Need to find out why voltage there is so low. There are only a couple sources for the 5 volts, most are fed from a splice..... maybe a bad connection there??

 

ok here's where I'm at.....key on the crank signal is 5.0 and the cam signal is ground. While cranking the crank signal drops to 0.8 and the cam signal goes to 5.0.....what is happening here I pinned the wire at the sensor and at the pcm and hot the same readings

 

That shouldn't be happening..... I think those are both three wire sensors? One is going to be a constant voltage feed, another is a ground, and the third is signal return wire to the PCM. Need an oscilloscope to read the return signal...... its a wave form, voltage plays a role, but, a relatively minor one. Feed voltage MUST be stable, and reliable, else you get all sorts of interesting problems.

 

Yeah I don't have one I've only got a power probe to ck voltage. The control from the pcm for both sensors are constant 5v its the signal on the crank that has me screwed up. I don't have rpms and it still won't start idk man I'm lost. I'm just about ready to drop the starter and dust shield and look at the toner ring

 

just for my general knowledge could you tell me how the asd circuit works. Is the signal from it supposed to a constant 12v or does it go to ground after awhile.

 

ASD is the auto-shutdown relay. It provides power to things like the coil, and injectors. The PCM will engage it at initial key on, along with the fuel pump relay. It will stay on for three seconds, then drop out, until the PCM sees the engine turning, usually from a signal from the crank, or cam position sensors. If it doesn't see that signal, it won't turn 'em back on.

PCM controls the ground side of the relay control circuit. Both fuel pump, and ASD relay's should have constant power on pin 30. 85 and 86 are the control circuit. I *think* 86 is power, with key on, and 85 goes to the PCM. PCM simply switches it to ground to activate the relay.