1998 Mercury Marquis Engine Misfires

1998 MERCURY MARQUIS
159,000 MILES • V8 • 2WD • AUTOMATIC
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JOSHLIN1932
  • MEMBER
  • 4 POSTS
When I am driving along and need to speed up my car hesitates and stumbles when I accelarate. We cannot locate the problem. It throws an EGR code, but the entire air flow system has be thoroughly cleaned, has a new EGR Valve and solenoid.

Thanks

Joshlin1932@sbcglobal.net
Sep 26, 2010 at 9:13 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
If it still popping up the code P0401 check the wiring and the computer-if its no longer showing the same code

could be caused by one of the following below:

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it.
Sep 26, 2010 at 1:33 PM
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