This Is A SPARK PLUG FAILURE And You'll Never Guess WHY!! Spark Plug Failure!! Spark Plug Internal Pressure Seal Failure!! Under-Torqued Spark Plugs!! #sparkPlug #engineFix #Toyota

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In this video I finally get to swap in brand new, factory recommended, spark plugs to the Toyota 4.7L V8. The vehicle in this video is my, new-to-me, 2005 Toyota 4Runner with the 2UZ-FE engine. I've been wanting to change the spark plugs and finally found a chance to do it.

Recently, I did get a chance to inspect the plugs when I was changing the valve cover gaskets and noticed the ignition coils were burnt. Upon inspection I noticed every single one of the plugs were loose. Some just finger tight. This is not good. An under-torqued spark plug can cause a lot of problems including an inability to dissipate heat to the engine. This can cause a spark plug to overheat and very likely cause failures such as this internal pressure seal that we see in this video.

I removed the old spark plugs and installed brand new Denso SK20R11 which is the factory recommended plug. I torqued them pretty much to spec (spec is very hard to find for some reason). I also replaced an ignition coil with a OEM Denso unit as well. I might swap out the rest of the coils soon as well.

Hope you enjoy this video!

**This channel is for entertainment purposes only! Do not do what I do. Do not take my advice. I am not a professional. The methods I use may be completely wrong and/or dangerous. Please seek professional help with anything and everything and do your own due diligence (research). Working on cars is extremely dangerous. I am not responsible for any loss of life or limb or property. DO YOUR OWN RESEARCH. THIS CHANNEL IS FOR ENTERTAINMENT PURPOSES ONLY!**

FTC Disclaimer: I am an Amazon associate. As such, I earn a percentage of sales made through Amazon associate links found in the description of my videos and on my website and other places.


00:00 Introduction
02:28 Driver Side Spark Plugs
04:14 New Spark Plugs
04:49 Issues On Driver Side
06:50 Installing New Spark Plugs
08:46 Passenger Side Plugs And Coils
13:50 Starting and Driving 4Runner
17:47 How's It Running
19:34 A Note From My Wife
21:10 Conclusion