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Truck Running Rough

Tiny
RONM1
  • MEMBER
  • 1990 TOYOTA PICKUP
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 340,000 MILES
1990 Toyota SR5 3.0 V6 running rough and burning to much gas. Have changed plugs, plug wires, distributor cap, rotor button, timing belt, tension pulley, idler gear less than a year ago and still did not help.
Friday, January 21st, 2011 AT 11:27 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Probable causes of an engine running rich are as follows:

1. Fuel pressure not within specs. Can be cause by restricted fuel return line or defective fuel pressure regulator.
2. Defective Oxygen Sensors.
3. Leaking injectors.
4. Coolant temperature sensor out of calibration.
5. Restricted air intake system.
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Saturday, January 22nd, 2011 AT 6:24 AM

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