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1997 Toyota Corolla Engine doing coughts ( speed vehicle c

Tiny
GGVAZQ1
  • MEMBER
  • 1997 TOYOTA COROLLA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 205,890 MILES
At the moment of reach the speed of 45 miles the car start coughing until get 55 miles still is doing the same. But after 55 miles the car runs pretty good.
I had ready change, Gas pump, spark plugs & wires, and the distributor,
In advance thanks for the advice.
Gerardo
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Monday, December 28th, 2009 AT 5:14 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Your probable causes could be one of the following:

Oxygen Sensor
Catalytic Converter
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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Monday, December 28th, 2009 AT 5:50 PM

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