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Chipster
Chipster 8/6/2012
2002 Mazda Protege LX 4Cyl2.0L - Engine
Why does my car hesitate when I step on the gas?
Car mileage-54,080 miles. I noticed a couple of days ago my car would hesitate when I stepped on the gas. Now the check engine light has come on and it seems like the engine will shut off when stopped at a red light or when I slow down then accelerate.
1 Answer
  • Jimm
    Jimm 8/6/2012
    Possible Causes of Engine Hesitation or Stumble:

    Dirty fuel injectors (cleaning the injectors often fixes this).
    Dirty / clogged air filter element (change the air filter)
    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
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