| quote | Originally posted by sourmash:
Right. You're probably right. The car was converted to turbo and had coil packs. Hmm. Wonder where the trigger is. Didn't think of to look.
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The successors of the 2.8 have crankshaft triggers. In the middle of the crankshaft is a notched wheel. Penetrating the right side of the engine block is a variable reluctance sensor.
These VR sensors would typically interface with the coil-pack module; this presented an "emulated distributor" to the ECU, which I guess eased GM's transition from distributors to coil packs.
There's a good chance your junkyard car had one of these setups.
Eventually, GM outgrew the "emulated distributor" paradigm, and the crankshaft sensor was wired directly to the ECU.