Hi John
The settings in my Haynes manual for the Sierra are with the engine running vacuum pipe disconnected, or at least that's what they say.
engine 2.0 ohc carb
up to 85 leaded unleaded
8 BTDC 4 BTDC
After 85 10 BTDC 6 BTDC
fuel injection 12 BTDC 8 BTDC
Roy
nice new site

same old me
