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Engine Mechanical
- Inspect the following:
- Engine compression. See ENGINE COMPRESSION TEST
under PRELIMINARY INSPECTION & ADJUSTMENTS in BASIC DIAGNOSTIC PROCEDURES - 4.6L DEVILLE & SEVILLE article.
- Sticking or leaking valves.
- Worn camshaft lobes.
- Valve timing.
- Worn rocker arms. See appropriate article in ENGINES.
- Broken valve springs. See appropriate article in ENGINES.
- Excessive oil in the combustion chamber, leaking valve seals.
- Inspect the following for incorrect basic engine parts:
- Camshaft
- Cylinder Heads
- Pistons, etc.