Engine hesitation

1999 TOYOTA TERCEL
140,000 MILES • 4 CYL • FWD • MANUAL
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PICKLEODEON
  • MEMBER
  • 1 POST
1999 Toyota tercel hesitation on reving the motor. Changed exhaust manifold O2 sensor and still have the same problem Plugs and wires are good and coils are all tested good
Apr 10, 2011 at 10:01 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Could be caused by one of the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it and keep testing.
Apr 11, 2011 at 1:33 AM
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