No Spark

[Justin_k]

Have a 1988 comanche was running before motor swap. (new) 4.0/AX15/NP231 put in. Pulled powertrain running out of a 1989 comanche, So here's my problem: I have no spark. Have power to the coil (yellow wire) And I have ground. I was reading that I need coil pulse to make it work. Is this correct? And if so where does the coil pulse come from?

Also new crank sensor

New cap and rotor

New plugs & wires.

On a completly unrelated note, I cannot turn my motor over with my key. Turn to run position and fuel pump primes everything turns on, but when I turn to start nothing happens, Are these 2 problems related?

Thanks

Justin

[Geonovast]

If the motor won't spin, how would you know you have no spark? Computer doesn't even fire the coil until the CPS reads 300 RPM.

[Justin_k]

I kinda have it hotwired right now. There's a bare wire P.O. spliced in and when connected to power it cranks over the motor.

[Geonovast]

First place to check with a no spark issue is the CPS itself. Unplug the connector, then plug it back in. If that doesn't work, unplug it again, and use a multimeter to check the ohms of the CPS. Should be between 125 and 275.

[Justin_k]

Thanks, will try tomorrow. Any ideas about the ignition problem mentioned above?

[kyleag89]

Ignition switch mounted under dash

[Justin_k]

So CPS is sitting at 290 ohms. Would that little difference keep it from running?

[Geonovast]

Possibly. See if you can have someone turn the motor over by hand while you keep the multimeter hooked up, and see what kind of range you get.