Symptom Checks

WARNING: This page is about a different car, the 1996 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

Check the following items:

Check cooling system for overheating. If cooling system is overheating, go to ENGINE RUNS HOT symptom.
Check ignition timing. See ADJUSTMENTS - 2.3L article.
Check EGR system. See the SYSTEM/COMPONENT TESTS article.
Check ignition system. See CIRCUIT TEST JD.
Check engine compression. Check engine mechanical condition. Check intake manifold gasket, camshaft and valves.
Check octane adjust system. See CIRCUIT TEST FG. If available, check Technical Service Bulletins (TSBs) for OCT ADJ information.