1992 Toyota 4Runner Engine run rough

Tiny
4RUNNERGUY
  • MEMBER
  • 1992 TOYOTA 4RUNNER
Engine Performance problem
1992 Toyota 4Runner 6 cyl Two Wheel Drive Automatic 3000rb miles

My engine runs rough in the mornings especially when the weather is cold. When the idle speed adjusting screw is move roughness starts and a rich gas smell is emitted from the exhaust runs smooth later in the day when engine warms up. Also a sound of air escaping come from the engine what do you think? Broke owner
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Thursday, November 4th, 2010 AT 10:39 PM

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Tiny
RASMATAZ
  • MEMBER
Engine running rough or misfiring can be cause by the following:

1. Defective spark plug
2. Inadequate spark/coil, defective spark plug wire.
3. Lack of compression
4. False air leakage.
5. Faulty fuel injectors.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
10. Throttle position sensor.
11. Manifold absolute pressure sensor
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Friday, November 5th, 2010 AT 6:09 AM

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