Testing Note
Need a step-by-step guide?
Get an AI-powered repair guide with parts lists, cost estimates, and clear instructions for your 1985 Pontiac.
Refer to ``Control Switches and Valves'' to test vacuum circuit controls and ``Computer Command Control (C-3) System,'' ``Electronic Fuel Injection'' or ``Diesel Electronic Control (DEC) System'' for EGR control solenoid tests.