Here's the pinout for the 1985 - 1986 2.8L MFI Pontiac application: A - Ground B - Diag. Enable (Resistance w/respect to pin A) C - Air switch solenoid E - Serial data line (TTL) F - Torque converter clutch G - Fuel pump prime Is this what you were looking for? The 2.5 Litre engine pinout is the same.