1991 Toyota Pickup engine problem

Tiny
ZACH1981
  • MEMBER
  • 1991 TOYOTA PICKUP
Engine Performance problem
1991 Toyota Pickup 4 cyl Two Wheel Drive Manual

what's wrong if the truck sounds like it's miss firing
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Tuesday, September 21st, 2010 AT 7:46 AM

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Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
It probably needs a major tune-up, when was it? Also do you have a check engine light

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. Idle air control valve.
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Tuesday, September 21st, 2010 AT 8:54 AM

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