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2001 Mercury Cougar misfire

Tiny
TYLERABBOTT
  • MEMBER
  • 2001 MERCURY COUGAR
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 170,000 MILES
Well the last few days ive been driving my car and I noticed when I come to a stop at the light and when I hit the gas to go it misfire or hesitates at low speeds
Sunday, September 13th, 2009 AT 10:02 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
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Sunday, September 13th, 2009 AT 10:10 PM

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