2003 Pontiac Montana No Spark

[grandamle91]

ok ill swap coils with my grand prix and get it a shot.

[1988GTU]

is the security light flashing or hard on illuminated when the vehicle doesnt start?

[grandamle91]

nope

[1988GTU]

Replace the cps harness from icm to sensor with a new harness. Neutral wire has to be the culprit.

[grandamle91]

I get a reading on it when I measure resistance and for AC voltage. Know anyplace that would sell it. I dont a pick an pull close

[grandamle91]

I ran a new home made wires and it started, see how long

[1988GTU]

itll be fine.

[grandamle91]

I ran a new home made wires and it started, see how long

Is the firing order

Back
1 3 5

Front
2 4 6

523641

????

[88corsica5spd28]

123456

[1988GTU]

Is the firing order

Back
1 3 5

Front
2 4 6

523641

????

looks right.

[grandamle91]

All i wants to do now it backfire, It tries to start but runs badly

[1988GTU]

http://60degreev6.com/forum/attachment.php?attachmentid=4703&d=1279399770

Thats the firing order for those with the ign/coils mounted under the front exhaust manifold. Flipping the numbers around would be correct to those with them mounted on top of the intake manifold (by Alt). That means, you have the correct sequence for firing set. When you put the pushrods back, did you take note where they came out and put the VERY SAME pushrod back where it exactly came from?

[grandamle91]

Plugs are right , it was running prefect before the wire broke. I think I might have something to do with all new sensors and using the old ign module. Had the same problem with my 91 Grand AM

[1988GTU]

Disconnect the battery pos and neg cables for 15 minutes, while you are waiting, pull your plugs and check them for fouling. Unplug the MAF and see if that changes anything should the battery disconnecting doesnt help and your plugs check out good.

[pocket-rocket]

Don't forget to twist the CPS wire from the crank sensor on the back of the block that leads to the ICM. The twists reject interference that the ICM is highly prone to get.