Exhaust Gas RECIRCULATION: 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.

Fig 1: 1974-76 Exhaust Gas Recirculation System
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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.

Fig 2: 1977-79 Exhaust Gas Recirculation System (MG)
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