Cylinder number four misfire

Tiny
SNOW1716
  • MEMBER
  • 2005 TOYOTA 4RUNNER
  • 4.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 118,000 MILES
My truck idled hard for a couple of days until my check engine light came on. I pulled the code for a cylinder four misfire. I replaced the ignition coil as well as all six spark plugs. First I replaced the ignition coil with a 'Duralast' part from AutoZone, but it lasted almost one day before the same problem. Next I replaced the coil with an OEM part from Toyota and the same thing happened. What do I do next?
Saturday, November 30th, 2013 AT 10:10 AM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Hello,

I would remove all coils and plug wires (if equipped) with OEM parts and recheck the way the engine runs. Here is a video that can help:

https://youtu.be/12nvBwIDXWM

Please let us know what happens.

Cheers
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Saturday, November 30th, 2013 AT 10:50 AM
Tiny
SNOW1716
  • MEMBER
  • 2 POSTS
Yep, that did it. :) Thanks for the help. I love this site.
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Sunday, December 1st, 2013 AT 12:35 PM
Tiny
MTARVIN28
  • MEMBER
  • 1 POST
  • 2005 TOYOTA 4RUNNER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 118,000 MILES
P0306 on 2005 4runner, replaced plugs and switched coil to cylinder five, still throwing same code. Only idles rough during cold start, after one minute, runs smooth. Thoughts?
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Saturday, August 25th, 2018 AT 6:15 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check compression and injector for number six cylinder.
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Saturday, August 25th, 2018 AT 6:15 PM (Merged)
Tiny
FENJOSH
  • MEMBER
  • 1 POST
  • 2004 TOYOTA 4RUNNER
  • 135,000 MILES
Mine is 4wd. I recently had the engine light come on and it was cylinder four misfire. I replaced spark plugs and it was fine. Then I started to get a rough idle when start and then it smooths out and it is fine. Then a week later the engine light came back on and it was the same cylinder misfire. So I replaced the coil pack and everything acted fine until yesterday, I started to get the rough idle back again and the same check engine code. Help?
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Saturday, August 25th, 2018 AT 6:15 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the compression and injector for that cylinder.
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Saturday, August 25th, 2018 AT 6:15 PM (Merged)

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