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1993 Ford Thunderbird engine misfires after 3000 RPM

Tiny
TYPESLICK
  • MEMBER
  • 1993 FORD THUNDERBIRD
  • V8
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
The car is a 93 thunderbird it mis fires after 3000 rpm it has a new fuel pump new plugs an wires, new distributor cap rotor, and coil I dont kno what else to check
Tuesday, September 29th, 2009 AT 12:21 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be caused by the following below:

Oxygen sensor
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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Tuesday, September 29th, 2009 AT 12:27 PM

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