paul culver
Member III
I've been having engine (Atomic 4) cut-outs after about one hour of motoring. It "heals" itself after about 30 minutes of rest, then repeats this cycle. An in-line spark tester showed loss of spark when the engine died and return of spark when it recovered. Replacing the coil appears to have fixed the problem, at least up to two hours of running under load.
When I room temperature bench-tested the new coil with a VOM it showed resistances of 3.2 ohms across the primary and 8,790 ohms across the secondary. When I similarly tested the old suspect coil I got 3.0 ohms across the primary but couldn't get a reading across the secondary at any range setting on the VOM. Its as if the secondary was an open circuit.
So I wonder why did the old coil even work at all during start-up, and what happens when it craps out an hour later, presumably from being heated up. Thanks in advance for your answers.
When I room temperature bench-tested the new coil with a VOM it showed resistances of 3.2 ohms across the primary and 8,790 ohms across the secondary. When I similarly tested the old suspect coil I got 3.0 ohms across the primary but couldn't get a reading across the secondary at any range setting on the VOM. Its as if the secondary was an open circuit.
So I wonder why did the old coil even work at all during start-up, and what happens when it craps out an hour later, presumably from being heated up. Thanks in advance for your answers.