Quote:
1987-’88 VIN D – The original crank was a 25532120 casting. The notches on the reluctor wheel were located at 0° when the engine was introduced in ’87, but by late ’88 or model year ’89, depending on who you talk to, the notches on the reluctor wheel were advanced by 15° even though the casting number on the crank stayed the same.
So the reason there are two different settings is because there are two different crankshafts. GM / Lotus advanced the crank angle by 15 degrees, presumably to help with faster startup. Mystery solved. Change the crank angle setting to match the installed angle at the sensor and you're done.