Truck isnt getting spark anymore. im at the end of my rope lol

[BIG BLOCK 555]

if it's connectd good it will fire without trans
is there any fault in PCM stored ? check it just to make sure

also check the wires from PRNDL to the harness

[Botlfed]

I hooked up to hpt and no codes I also changed the prndl and pcm.

[Botlfed]

bump

[BIG BLOCK 555]

check hood fuse box for ignition fuses after that make sure all wires from your harness to the coil packs ar good

[Botlfed]

I'll check em again, but if I cant find something this time im gonna pull the entire harness and check it.

[canada4g63]

I'm pretty sure you have a bad ground.

[Botlfed]

That was what I thought but why would it just now do it, im gonna look this weekend but I have a feeling im gonna end up pulling the harness.

[skeet]

the sensors you changed , were they new or used but in working order? an this has me puzzled as i been thinking what it could be, unless you have a short in the wiring and youre sure your grounds are clean and tight its mind boggling

[banker099]

Ignition relay?

Also might run a jumper wire from the ground on the coil pack main plug to a good ground and see if you get spark

Try ignition relay first if u haven't yet...swap it with some other relay and see what happens

[Botlfed]

Ignition relay?

Also might run a jumper wire from the ground on the coil pack main plug to a good ground and see if you get spark

Try ignition relay first if u haven't yet...swap it with some other relay and see what happens

I pulled the relays and put new ones in, how do I do this jumper thing.