Question about Cars & Trucks
Your engine uses a "waste spark" ignition, meaning it uses one coil for each pair of cylinders. The high voltage current path is to the first spark plug, through the aluminum cylinder head to the secodn spark plug, then out of that plug back to the ingnition coil. One plug fires on the comrpession stroke and the other on the exhaust stroke to ignite any unburned exhaust gasses. The engine's computer "fires one coil at a time based on signals from the crank angle sensor and the cam angle sensor. Likely the problem with your engine is with one of those two sensors.
An OBDII scanner will indicate which sensor is defective. If the engine ran fine before you turned it off, and now it will not start, the problem is likely the crank angle sensor (close tot he crank pully). Otherwsie, oif the engine starts sometimes and not others, it is due to a defective cam angle sensor (near the intake cam "gear" (where the timing belt cover is).
Posted on Nov 26, 2014
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Posted on Jan 02, 2017
1987 Oldsmobile Delta 88
3.8 liter V-6 VIN "3" Identifying Ignition Types I and II
On Type II coil packs, the coils can be replaced separately and the ignition wires are all on the same side of the coil pack.
With Type I Ignition
With Type II Ignition
Posted on Aug 28, 2009
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