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2004 Nissan Pathfinder decrease in acceleration

Tiny
KEVIN_LB
  • MEMBER
  • 2004 NISSAN PATHFINDER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 69,850 MILES
Suddenly the car died and I was pushing on the gas but the rpm was only rising to 2000 to 3000 rounds per minute. I went to the mechanic he said it is from the catalytic converter. I cut the out and the jeep was doing better but it didn’t go back to its usual power. The acceleration is so decreased, and I noticed that it used to shift gears more quickly. My mechanic said it is either from the fuel pump or from mass airflow. I put it on the scanner it showed catalytic system code 0230 and 0240.
What do u think is happening
Thank u
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Wednesday, September 16th, 2009 AT 6:22 AM

2 Replies

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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Wednesday, September 16th, 2009 AT 12:07 PM
Tiny
KEVIN_LB
  • MEMBER
  • 9 POSTS
Thank u man.
U really helped me out.
I will tell the mechanic about these sensors and see what happen.
Thank u
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Friday, September 25th, 2009 AT 12:31 PM

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