P0300

Hey all,

Little bit of a mystery on my 2011 v6

I went to pass a guy doing about 40 in a 50 yesterday and upon acceleration the truck stuttered a little and the check engine light started blinking. I got around the guy, but I pulled over and hooked up my code scanner pending p0300 misfire in two or more cylinders. I shut the truck off and started it again, no more check engine light. Made it the 40 minutes home without incident.

Any ideas? I'm thinking spark plugs?

 

If you have never done plugs that would be a good place to start, they are due every 30k on the 4.0 although most people run them over 100k.

Also check for oil in the spark plug tubes which would indicate leaky tube seals.

https://www.tacomaworld.com/threads/2nd-gen-information-diagnostics.784008/#post-28042157

 

Excellent, thanks.

I'm certain it has been a lot more than 30K since the plugs were replaced. I had a coil fail this winter as well, so I may just go through the ignition system completely.

 

Update. All of the spark plugs looks like this:


Could that have caused a misfire?
About a .078 gap on most of them

 

100%

 

Thanks. Valve cover seals are next. Found a little bit of oil on one of the plugs too.

 

So I was looking at the plugs I pulled out again and one of them was pretty oily on the electrode.

Could oil have gotten this far down the plug from a bad tube gasket? Or would this be an indication that something is going on in the cylinder itself?

Truck is running much smoother with new plugs, but I guess that's kind of a given

 

I believe it was the 6th cylinder in the firing order. So the one closest to the driver if that makes sense.

Good to know, thanks!