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2001 Mercury Cougar drivability problems

Tiny
01COUGMAN
  • MEMBER
  • 2001 MERCURY COUGAR
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 87,000 MILES
I have a 2001 Mercury Cougar with 87k miles. It has an automatic transmission and 2.5 liter Duratec. Recently the car started backfiring & bucking when going up hills and also when the accelerator is applied hard. I am also experiencing unusual RPMs and my interior lights will subtly flash. I realize that the latter is a separate occurance from the former. The work that has recently been performed includes: new 02 sensors, MAF sensor, Solenoid sensor as well as spark plugs and wires. I'm beginning to believe that my mechanic is playing the lotto instead of diagnosing the problem.
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Thursday, March 17th, 2011 AT 4:42 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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.
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 and keep testing.
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Thursday, March 17th, 2011 AT 7:28 PM

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