GRAND CHECK ENGINE LIGHT COMES ON
1996 Mercury Marquis • V8 2WD Automatic • 42,000 miles
1996 Mercury Grand Marquis mileage: 42,000. Every several hundred miles or so (between code clearing), the check engine light will come on. The codes are 0171 and 0174 indicating a lean condition. Gas mileage is also down about 10%. I have replaced the fuel filter, fuel pressure regulator (fuel pressure is 31 psi with vacuum and 42 psi without) and EGR valve. I have also tuned the car replacing plugs, plug wires and air filter. Any ideas as to what is triggering the codes?
Try replacing the oxygen sensors.
Can anyone guide through changing the fuel pressure regulator?
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