I haven't swapped the plug, but I did ground the plug wire directly to the engine block (bypassing the plug all together), and still had the same, crappy spark.

compression tests are garbage. the engine has 254K on it, so its a bit tired. I took it to the dealership in hopes of solving the mystery, they were no good. They told me it was because the engine has low compression.... ON CYLINDER #4. they only tested the drivers side bank and it read out #6 = 140 #4 = 100 and #2 = 180. So, maybe according to them, it's because the compression is too high. I hate dealerships.


I know it should be in the cap. but I think its somehow a computer problem. When I pulled the cap off, the contacts all had the same amount of carbon on them except the #2, it had noticably less carbon on the point under the dist cap. SO, the computer is telling it not to fire on #2 for some reason. that being said, there have been 3 different ECUs in this truck (that I know of), 2 different distributors and 3 different cap/rotor combinations and it still does the same thing.

I have squirted a 1980 280ZX that had a bad ignition chip and some finnecky ecu porblems, and I havent looked back. Megasquirt is lightyears ahead of the system in that car, the system in the mitsubishi seems to be almost like that of a Z31 300zx. and those are VERY easy to squirt.