Exhaust Gas RECIRCULATION (EGR) System: Maintenance
- Remove EGR valve and clean base of valve with a wire brush. Using a spark plug cleaner, clean valve seat and metering valve by holding the diaphragm upward. Blast valve at 30 second intervals until clean.
- Remove all traces of carbon and cleaning compound (from spark plug cleaner) using compressed air. Inspect ports in manifold for carbon build-up. Light deposits are acceptable. If heavy deposits have accumulated, the manifold must be removed for cleaning.
- Install EGR valve and bring engine to normal operating temperature. Repeat EGR test as previously described.