EGR System
- Apply about 8 in. Hg vacuum to EGR valve with a hand-held vacuum pump. With engine warmed up, engine should stall or idle rough.
- 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.