EGR System
- Apply about 8 in. Hg to EGR valve with hand vacuum pump. With engine warmed up, either rough idling or engine stall should occur.
- If engine idle does not change, check EGR pipe and gas passages for clogging and leaks. Clean or replace if necessary. When cleaning, inspect exhaust gas inlet to intake manifold for presence of deposits. Inspect EGR inlet pipe for exhaust deposits.