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1992 Nissan Maxima

Tiny
92MAZIMA
  • MEMBER
  • 1992 NISSAN MAXIMA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 192,000 MILES
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
Sunday, December 27th, 2009 AT 8:29 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 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
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Monday, December 28th, 2009 AT 12:03 AM

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