Truck Running Rough

1990 TOYOTA PICKUP
340,000 MILES • 6 CYL • 4WD • AUTOMATIC
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RONM1
  • MEMBER
  • 1 POST
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.
Jan 21, 2011 at 3:27 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 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.
Jan 21, 2011 at 10:24 PM
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