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Limp in home mode, a fail safe in most CPU cars etc 88 and on
yeah that's what the wrecking yard guy told us. My guess is the signal off the pickup coil was bad so it took 1 of the signals and used it for the limp mode.
I'd bet the bank the signal looked like this...
___---___---___---___---___ good signal ___---___---_________---___ bad signal