Mercury Marquis Engine Poor Mileage

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2000 Mercury Marquis UNSOLVED HORRIBLE GAS MILEAGE...

2000 MERCURY MARQUIS

(2000 Mercury Grand Marquis) Fuel Filter,spark Plugs,upstream O2 Sensors,new Mass Air Flow Sensor,air Filter,at Fluid And Filter Change...

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Asked by 2000marquis

1990 Mercury Marquis Poor Fuel Economy

1990 MERCURY MARQUIS

This Is A Garage Kept Beauty Well Maintained, Recent Tune Up Plugs Cap Rotor,air Filter , Car Gets 10 Mpg In Town 14 Hwy, Great Power No...

1 ANSWER

Asked by 302ernie

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Backfire Burning Oil Compression Gas Hard to Start Hesitate Idle Erratic Idle High Idle Low Idle Rough Knock Lean Locked Up Loud Low Power Misfire Noise Not Cranking Over Not Running Oil Leak Overheat Poor Mileage Rattle Revs Up Runs Hot Runs Rough Shakes Smell Sputter Stall While Driving Stall at Idle Surge Tap Tick Vacuum Leak Vibration Whine

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