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Poor Fuel Economy

NOTE: If EGR related, poor fuel economy is usually accompanied by detonation or other symptom of restricted or no EGR flow.

EGR valve leaking at mounting or internally. PVS or TVS malfunction. Ignition timing retarded. BVT system malfunction. Vacuum leak at EVP sensor. WOT valve malfunction. Blocked EGR passages or ports. Insufficient exhaust backpressure to operate EGR valve.