1994 Oldsmobile Cutlass Ciera

Symptoms of a bad EGR

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  1. 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

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