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Ok, this is what I know.... The cam sensors in Tauruses (particularly the 3.0L 2-valve) is actually a synchronizer that takes place of the old distributor and is used for fuel injector timing more than anything and also drives the oil pump. The crank sensor is used for spark timing since they have coil packs instead of coil on plug ignition. The reason I know this is because I fought with one for many hours and as many times as it was out-of-time, it ran fine. Now, the 3.0L DOHC uses the cam sensor for #1 TDC identification as well as injector timing. The older Tauruses that still had distributors didn't have either crankshaft or cam sensors and used a TFI ignition module for spark timing and were fairly notorious for failing (causing stalling and no-start). The TFI module sent a PIP (profile ignition pickup) signal to the PCM which used that to gang-fire the injectors (1,3,5 all at once, then 2,4,6 on the second round) Hope this helps.
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