2003 Pontiac Montana No Spark

[grandamle91]

Just did a top end rebuild. Before the rebuild it was running on 5 cylinders. #1 had a stuck intake valve. Got everything back together had spark but would just backfire, pulled all wires and rechecked firing order. Tried again and now nothing, no spark, plugs are dry so I dont think it's getting gas either. Fuel pump primes and has pressure. Any ideas. How does the Ing module ground it's self

[pocket-rocket]

If the plugs are dry and you don't have spark I would check your connections at the ICM. I believe the ICM grounds itself through the heat sink it sits on.

[grandamle91]

Ok ill sand the spots it makes contact with the manifold and try again after work, if the snow holds off

[grandamle91]

Ok I tried to ground it better even ran a ground strap from it to the battery. Still no spark. Did smell fuel this time.

[pocket-rocket]

Fuel is a good sign. That means you are at least getting a signal from the crank sensor to the ICM which then goes to the PCM. It doesn't guarantee your ICM drivers for the coils are good. Are you checking spark on the same coil or have you checked each coil for spark?

[grandamle91]

I'll try each coil, Wish it would quit snowing

[pocket-rocket]

I'm not looking forward to when it starts here...

[grandamle91]

I'm not looking forward to when it starts here...

It's melting right away but hate it already usually don't get any till Dec.

i tried each coil and i'm getting no spark

[grandamle91]

Ok i pulled the Ing Moduel and had it tested. Tested bad. Bought new one, still no go. bought new crank sensor on the back on the engine still no go.

[grandamle91]

Got it running

[bszopi]

What was the issue?

[grandamle91]

Don't know its been a hit and miss, this morning it had no spark again

[1988GTU]

CPS is fault.

[grandamle91]

CPS is fault.

Which one, the one has been replaced twice both were testing in there range.

The cps is showing 180 rpms when cranking, the one in the block is showing .4 ac volts off and on

[1988GTU]

Probably this...


if this is BRAND NEW.