Weak Spark on 94 Metro 1.0L

[amgeneral]

Hi, I’m a first time poster on this site.

I have a strange problem with a Metro that I hope someone here may have a solution to.

I’m a diesel mechanic, and I rebuild Military equipment, this little car is driving me nuts.

It is a 94, four door, with an auto trany. I can get the 1.0-liter engine to turn over but it has a very weak spark.

I tried a new coil and I still have the same problem.

I tried a distributor off another geo that was runnable.

I tried a ECM out of another geo of the same year and configuration.

I tried any other modules I found under the dash that would plug in.

I tried making sure all the ground connections are good.

I tried a new cap and rotor.

I checked all the fuses.

I went up and down the wire harness in the engine compartment to see if anything was apparently wrong, and found nothing.

It’s nuts I can get a spark right from the coil, but it is real weak and will not even jump the gap between the rotor and the cap.

any help would be great,
Thanks,
AmGeneral

[sa-jim]

amgeneral... sounds like you've pretty much covered it. You might want to check that you're getting a full 12V to the coil.