NORMAN 8/1/2012

1990 Nissan D21 SE 6Cyl3.0L - Engine

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WHY DOES MY CAR HESITATE WHEN I STEP ON THE GAS?

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  Jimm 8/4/2012

  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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  NORMAN 8/6/2012

  FOUND OUT TO BE A WRONG TIMING POSITION

  

  NORMAN 8/6/2012

  THANKS