Preliminary Check
WARNING: This page is about a different car, the 1994 Mercury Tracer and 1994 Ford Escort. However, it is still accessible from the selected car via links, so may be relevant.
Visually inspect engine compartment to ensure all vacuum hoses and spark plug wires are properly connected. Examine all wiring harnesses and connectors for damaged insulation, burned, overheated or damaged pins, and loose or broken conditions. Check sensor shield connector. Ensure ICM mounting screw is tight. Ensure battery is fully charged and all accessories are off during diagnosis.