1985 Nissan Truck engine runs rough

1985 NISSAN TRUCK
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JWH1523
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  • 1 POST
Engine Performance problem
1985 Nissan Truck 4 cyl Four Wheel Drive Manual

I have a 85 nissan truck it idles perfect but I drive it it sounds like it misses but I can give it gas and it clears up it only does it when you try hold the gas pedal steady I've change plugs,plug wires,cap,fuel pump
Jan 1, 2010 at 8:26 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Check and test the following below

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
Cap and Rotor
Jan 1, 2010 at 8:32 AM
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