Visual Checks

WARNING: This page does not describe the selected car, but rather 27 other vehicles, including the 2021 Lincoln Navigator, 2021 Lincoln Nautilus, 2021 Lincoln Corsair, 2021 Lincoln Aviator, and 2021 Ford Transit-350 HD. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the air cleaner and inlet duct.
Check all engine vacuum hoses for damage, leaks, cracks, kinks, and proper routing.
Check the electronic engine control (EEC) system wiring harness for proper connections, bent or broken pins, corrosion, loose wires, and proper routing.
Check the PCM, sensors, and actuators for physical damage.
Check the engine coolant for proper level and mixture.
Check the transmission fluid level and quality.
Make all necessary repairs before continuing with the quick test. For additional information, refer to Quick Test Description.