My 91 4-cyl Trooper has had this problem off and on since I bought it 6 years ago. Now it seems to be less intermittent and more semi-permanent. No spark from the coil.

The first time it happened (6 years ago) the first thing I did was check for fuel flow. As soon as I bumped the starter, it was a gusher. Plugged the fuel line back in and it started right up. Well, this method lasted three or four years, and I only had to do it three or four times per year. And I never had a fire!

Then one day it didn't work. I checked for spark, and there was none. As I messed around with connections and such, at one point I forgot and had left the key to "On" while I was jiggling fuses. Heard a "pop" from somewhere in the dizzy area and then the truck was starting again no problem.

After that my "fix" was to jiggle the coil wires at the connector, and it worked every time. Not any more. I replaced the coil years ago to no effect, just did the module and distributor, and still no spark, even using my tried and true "fixes".

So I decided to see if there was a stored code even without the Check Engine Light on. Jumped the ECM wires, turned the key, no CEL. Hey, that's not supposed to happen! Unplugged the ECM jumpers, turned the key to "ON", no CEL. Pulled the cluster, swapped bulbs with the O2 indicator, no CEL.

Now I ride a little low, and many of you know the CEL is the lowest indicator on the panel, so I don't even know if this is a new problem or an indicator of the "intermittent" problem. Is my ECM dead or dying or do I need to buy a test lamp and check out every stinking circuit that can energize the coil? Or maybe just pull the fuse block and replace it?