One of the easiest - and often overlooked - maintenance jobs on a Tacoma or 4Runner is replacing the PCV valve. This is a one-way check valve that allows blow-by crank case combustion gases back into the engine to be combusted, rather than vented to the atmosphere (where they would cause pollution). As a check valve, the part is quite simple, but over time the spring in the check valve can wear out, and the grommet that holds the PCV Valve onto the engine can harden due to constant heat/cool cycles. When that happens, replacing it becomes difficult, as bits…
4 CommentsTag: drive shaft
February 21, 2018. I've had a rattle for a little over four months. I first heard it (I think), when returning from The De-Tour at the beginning of October, or else maybe a week or so after that. It sounded like a loose heat shield, or other piece of sheet metal, rattling away under the back half of the truck. But I knew it wasn't a heat shield - it only happened at speeds above about 15-20mph, and changed when under load (vs. coasting) and there were certain throttle/speed/terrain combinations where I could almost get it to go away. Of…
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