Toyoto4runner rough running

Tiny
FRNWATKINS
  • MEMBER
  • 1994 TOYOTA 4RUNNER
  • 6 CYL
  • 4WD
  • MANUAL
My 1994 4runner runs rough at first. It's fine later, but the mileage is less than it used to be
Tuesday, July 5th, 2011 AT 7:57 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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. Vacuum leak
5. Fautly fuel injectors.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
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Saturday, August 6th, 2011 AT 5:07 AM

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