I'm totally lost here so the actual engine is causing the coils not to fire?? I don't understand!? I have a completely different motor in mine and never had any issues like this...4" crank, 6.125 rod, 3.903 bore.

I'm not kocking your idea here im just seriously confused on how it can be the fault of the actual motor / reluctor wheel, that your coils arent firing?!? You said you check it with an ignition timer and its definitely not firing!?? Or am I just missing everything here

Even if the reluctor was completely broken, it wouldnt stop certain coils from firing at all!!! Would just fire way out of order, I think you have another issue my friend, Honestly!!! I'm not 100% sure what it is myself....but i highly doubt that the crank position has anything to do with the coils simply not firing....I'm lead more towards wiring harness failure before I'd blame your nice new motor

 

If the PCM isn't "seeing" the sign wave from the crank sensor, or if it is wrong who knows what the PCM will do.

But if the reluctor wheel is wrong WHY isn't there any codes? also I wnot sure if the PCM uses the Crank sensor, but "most" PCMs use the cam sensor for timming....

Does anyone know the logic the PCM uses for timming?

 

correct. the pcm uses the cam sensor for timing but will run with out the signal. it just fires everything in order and sets a code. it may eventually set a codes while trying to crank on it but if it doesn't understand what is going on then it can't set a dtc. it would lean towards the reluctor wheel being installed incorrectly or it being bent. dumb question but have you verified that the cam and crank sensors are fully seated. just cause the bolts are tight doesn't mean they are fully seated.

 

Throw a DVOM on the sensor and see if you are getting a good signal. It wont tell you if it is not clocked right, or if the tooth count is wrong, but at least it will verify the wheel and sensor..

 

I dont think anyone is wrong with the reluctor wheel not being right, could cause a problem...but it still doesn't really answer how it would cause the coils to not fire at all, so suddenly. Wouldn't it at least attempt to fire all coils at least for a few revolutions before deciding that something is wrong and to not fire 1,4,6,7. The PCM isn't going to know right off the jump that the wheel is off by 3 teeth before it actually tests it!!! Unless you've only checked the coils after the truck has ran more than a few revolutions!!! I'm just asking, cause i honestly don't know myself!!

 

Thanks for all the input guys. I'm not sure what the wrong reluctor would do, it's just the only thing that I could imagine causing the problem. I am picking up another motor this week to see if the problem follows the motor or if is is something with the truck.

Wilde-I'll see if I can try the DVOM first.

Thanks again guys! I'll let you know if I can come up with anything.

 

Be sure to set the meter to read AC volts

 

it really sounds like a security no-start.... the pass key is interfering. When it's tripped it will run the motor for a few seconds and cut it off just like described.... just to humor us, try it. Here's a link to the instructions:
http://nelsonperformance.com/passkey.htm

 

That would be a easy fix.... Lets hope that's all it is....

 

I tried the security no start again, just to be sure and it isn't the problem.