1992 Nissan Maxima

1992 NISSAN MAXIMA
192,000 MILES • 6 CYL • 2WD • AUTOMATIC
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92MAZIMA
  • MEMBER
  • 1 POST
When driving car RPM's drop and then come, drop and then come back. Sometimes engine stalls, I put it in neutral and start up and the engine runs fine for a little bit, then it repeats the RPM situation.

DOHE
Dec 27, 2009 at 12:29 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Possible causes could be one of the following:

Oxygen Sensor
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
Dec 27, 2009 at 4:03 PM
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