Engine Runs Rough At Idle
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2002 Mercury Sable, 2002 Mercury Mountaineer, 2002 Mercury Grand Marquis, 2002 Mercury Cougar, and 2002 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition switch to ON position. Using scan tool, select INJxF PIDs from PID/DATA MONITOR & RECORD menu. There is one INJxF PID available for each engine cylinder, and the "x" indicates the appropriate injector number (1-10). AllINJxF PIDs should indicate NO (no fault). If any INJxF PID value indicates YES, an injector fault exists. Go to TEST HA, step 60) (Natural Gas models), or go to TEST H, step 56) (all others) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article.