1994 Oldsmobile Cutlass CieraJune 29, 2015Symptoms of a bad EGR Share Tweet Pinterest Keywords:CutlassengineNo PowerNo Startpoor gas mileageRepair manualrunning roughstalls 1 thought on “1994 Oldsmobile Cutlass Ciera” Freeautomechanic June 30, 2015 at 1:17 pm an EGR valve that’s stuck open will cause a noticeable drop in horsepower at the very least. Along with that may come detonation — “knock” or “ping” — under hard acceleration, and the attendant cylinder misfires. The engine will also see an open EGR valve as a massive vacuum leak, so expect hard starting and a very rough idle. An EGR stuck closed or clogged with carbon won’t exhibit many symptoms, since engines don’t technically need them to run. But expect a very noticeable drop in fuel economy, a noticeable gasoline smell from the exhaust pipe, a very hot catalytic converter, or all of the above. Source: Ehow Comments are closed.