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1990 Nissan Pathfinder

Tiny
GITA
  • MEMBER
  • 1990 NISSAN PATHFINDER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 33,000 MILES
I have no problem starting my vehicle and it does not stall but when I exceed 100 km it makes noise and feels like it's struggling. Does this means I need a tuneup?
Monday, September 7th, 2009 AT 3:06 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
A good place to start and go from there also see below probable causes.

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, September 7th, 2009 AT 3:10 PM

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