• Tiny
  • su
  • 1997 Toyota Previa
  • automatic
  • 89,000 miles

1997 toyota previa automatic, power loss after driving for 30 minutes on the motorway speed drops from 60mph to 30mph despite accelerating. Thought it was transmission slipping but oil changed and appears to change smoothly, engine does not overheat and no engine lights on dash can anyone help?

Do you
have the same problem?
Monday, July 11th, 2011 AT 6:56 PM

1 Reply

  • Tiny
  • rasmataz
  • Member

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.

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Monday, July 11th, 2011 AT 9:55 PM

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