When the engine is running at low RPM, lower temperatures in the combustion chambers prevent all the fuel from burning, so the flow of unburned hydrocarbon gases coming out of the tailpipe increases significantly. A slight-or strong-fuel odor while operating the vehicle, because of the increase in hydrocarbons leaving the tailpipe (see the next symptom).A rough idle upon starting the engine (that is, when the engine is cold) and sometimes at a stop light or while looking for a spot in a parking lot (that is, at low engine speeds in a warmed-up engine). You'll notice one or more of the following symptoms: This will cause a continuous flow of exhaust gases into the intake manifold. An EGR valve can fail in two ways: It can be open all the time, or it can be closed all the time. Actually there are two kinds of bad EGR valves, with different symptoms.
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