Miscellaneous Component Or System Checks

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2003 Mercury Sable, 2003 Mercury Mountaineer, 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

Check the following:

Check fuel delivery system. Go to TEST HB: NATURAL GAS FUEL DELIVERY SYSTEM , step 1) (Natural Gas models), or go to TEST HC: GASOLINE FUEL DELIVERY SYSTEM , step 1) (all others) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
Check secondary ignition system. Go to TEST JB: SECONDARY IGNITION , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
Check Mass Air Flow (MAF) sensor. Go to TEST DC: MASS AIRFLOW SENSOR , step 25) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
Check exhaust system for restriction. Go to TEST HF: CATALYST EFFICIENCY MONITOR & EXHAUST SYSTEMS , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
Check engine compression. Check engine mechanical condition and repair as necessary. Check intake manifold gasket, camshaft and valves. See appropriate article in ENGINES.
On A/T models, diagnose by symptom (POOR PERFORMANCE). See appropriate OVERHAUL or DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.
Check for binding or dragging brakes. See appropriate article in BRAKES.