1990 Nissan 300ZX



July, 31, 2009 AT 2:57 PM

Engine Mechanical problem
1990 Nissan 300ZX 6 cyl Two Wheel Drive Manual 40000 miles

I have a 300zx twin turbo and the problem is it will not rev over 3500rpm and I can barely get up to 40mph. It is not giving a check engine light but I had it checked anyway and it said problem with right o2 sensor, it is reading back and forth between rich and lean and said to check for vac. Leaks. Could this cause my car to run this way.

ps. That is the only problem the scanner showed, everything else check out


1 Answer



July, 31, 2009 AT 4:02 PM

There's other things that can do -see below

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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