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2001 Other Mercury Models from 45-55 mph the car jerks

Tiny
ANGELPREYER
  • MEMBER
  • 2001 MERCURY
  • V8
  • 2WD
  • AUTOMATIC
  • 122,222 MILES
I have had spark plugs & boots changed, fuel injection cleaned and new filter still doing it! Jerks in over drive and with over drive off. Is this sumthing major?
Friday, April 16th, 2010 AT 6:08 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Inspect and test all the following listed below and get back with some results

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position 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.
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Friday, April 16th, 2010 AT 6:15 PM

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