I have been struggling with a dead ZJ since October and after everything it still won't turn over. It cranks like crazy and gets fuel, but the spark coming out of the coil is weak. When I put a noid light on the coil primary the light flashes as expected when cranking. The light is strong when it is on, which tells me that the power to it and the ground signal from the PCM is good, but the spark off of the coil secondary is hardly noticable. This is my second Mopar coil so I tried an aftermarket one today and it is weaker than the Mopar one.
I can't figure out what the issue is. I cleaned all the grounds last weekend. I cleaned the metal mount that the coil attaches to (at the point where it is bolted to the engine and where the coil connects to it). The ground on the fender is good an clean. Where the ground cable connects at the coil mount is clean. Since the starter gets its ground from the engine I have to assume this ground point is good since the starter cranks the engine nice and strong.
My wife is ready to leave the ZJ on the side of the road to get rid of it except we would have to push it there.
I am baffled and completey confused. New CKS, cap, rotor, wires, coil, MAP sensor, fuel pump, fuel filter, new battery terminals, cleaned grounds...
No codes presented when checked with ON-OFF-3x... ignition method.
Help wanted...
Lon Allen -
94 ZJ 5.2L 327K miles...