My '96 Chevy S10 began to run rough and the "check engine soon" light came on. I replaced the plugs and have the same trouble. Three of the 4 plugs look the same, signs of use, but the #2 plug looks like it hasn't fired for a while. Sure enough, I get no spark from the #2 wire. I get a resistance to ground from the #2 and #3 spark plug wires, but not from #1 or #4. This is a weird ignition setup, with two coils and no distributor. It looks like one coil fires cylinders
1 and 4 and the other fires cylinders 2 and 3. I assume it fires twice each revolution in both cylinders, with only one cylinder having an effect at a time.Anyway, I'm suspecting that the coil feeding cylinders 2 and 3 is faulty. I'm thinking of swapping it out with the one for cylinders 1 and 4 to see if the problem follows the coil, but I'm wondering if there's a difference between these two parts since one is labeled 1/4 and the other one is labeled 2/3. Does anyone know if it's safe to swap these?
Thanks in Advance.
Dave B.