Random misfire question. (2 Viewers)

[Holywort]

Howdy folks,

I could use some help from the brain trust. I have a 98 100 series as well an '03 V8 4Runner, that immediately after an oil change, I got a 2,4,6,8 misfire code. With a better reader I'm also showing an O2 and catalyst code. I'm not one to believe in coincidence and I don't want to just throw parts at it. I thought I figured it out at first when I pulled the coils, they were original, and they all had a crack down the side. Replace all with OE coils. Plugs were replaced 10k ago. I figured it would be something simple but I’m stuck. Any thoughts or suggestions are appreciated.

Thanks,
Mike

 

[kbfj621989]

Did you pull the plugs to inspect them? Are they OEM plugs. If possible, post a picture of them. I would be concerned if they were heavily fouled or showing heat damage on the porcelain.

 

[Holywort]

Did you pull the plugs to inspect them? Are they OEM plugs. If possible, post a picture of them. I would be concerned if they were heavily fouled or showing heat damage on the porcelain.

I did pull the plugs they were clean.

 

[Holywort]

I also forgot to mention that I did a head gasket test and it came back as healthy

 

[Holywort]

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