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2003 Toyota Tacoma code PO304 PO301

Tiny
BOOHAKER
  • MEMBER
  • 2003 TOYOTA TACOMA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
Check engine light on, (not flashing) code indicates engine cylinder one and three misfiring despite "tune up". Plugs, fuel filter, (no new plug wires) what's up with this code? Safe to drive? Advise on course of action. Thanking you in advance. Boohaker
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Sunday, February 21st, 2010 AT 6:21 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Inspect and test all the following listed below:
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.
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Sunday, February 21st, 2010 AT 7:01 PM

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