Cylinder number four misfire

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?

6 Replies

JACOBANDNICKOLAS

MECHANIC
109,724 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

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

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)

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)

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?