1986 Mazda 323 Engine bucks

Tiny
BKROLL
  • MEMBER
  • 1986 MAZDA 323
  • 4 CYL
  • FWD
  • MANUAL
  • 366,000 MILES
Engine bucks at upper RPM range when trying to accelerate. Mostly in the higher gears 3rd through 5th
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Monday, July 6th, 2009 AT 5:03 PM

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Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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, July 6th, 2009 AT 5:09 PM

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