One very common issue on the 4th generation Toyota 4Runner is an oil leak that occurs at the front corner of the passenger side valve cover. Changing out the valve cover gaskets on both passenger and driver sides can be a bigger job, but mainly because it can be a bit overwhelming with the amount of parts you need to disconnect or remove. Therefore, it’s very important to be organized when removing parts and to document everything you take apart. Photos along the way help tremendously in guiding you to put everything back in the right order. I hope this guide helps you if you need to replace the valve cover gaskets on your 4.0L V6 (1GRE-FE) 4th Generation Toyota 4Runner.

The Mass Air Flow (MAF) sensor is a device that is located at the air intake, which measures how much air is coming into the engine and then tells the vehicle how much fuel it needs to inject. Over time, the MAF sensor can become dirty and require cleaning. Since the sensor on these vehicles utilizes an extremely delicate “hot wire”, used to measure air flow, it cannot be cleaned with regular cleaners or even brake cleaner. A mass air flow sensor cleaner is required to safely clean the hot wire.