Quote:
Originally posted by claytonb78
MY brother switched to a K&N air filter about a year ago and recently has been having engine problems as a result of the air filter actually. It was one to go into the OEM slot and the problems started after the first time he cleaned it. Mind you he is no professional but did follow the cleaning instructions and apparently the oil used to "recharge" the air filter got into his engine to cause some problems. I am sorry I do not have more details but needless to say his experience has turned me off buying a K&N HIK kit for my 4Runner.
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My bet is he over-oiled it. They don't need alot of oil. I find that filling a small spray bottle (I use an empty eyeglass cleaner bottle) and using that to apply the new oil works very well indeed. You just need to dampen it, don't drown it, or indeed, excess oil will get sucked into the engine, and can wreck havoc with sensors.
I've recently acquired my 4Runner, but I had a Tacoma with the 3.4 V6 in it prior to this. The K&N filter I had in that never gave me a lick of trouble, and it did give a small but noticeable improvement in performance. I also used the "deckplate mod" for the airbox to improve airflow on that, and that too helped a little bit.
K&N filter for my 4Runner was one of the first things I bought for her. $43 bucks at the local Auto Zone.
People debate wether Toyota would have chosen a wet type filter over a dry paper filter in their designs if they were so good. They are considering other things besides performance and filtration quality. They have to think about unrelated things such as how long it takes for service techs to clean & re-install filters as opposed to making $ selling replacement elements. It's a heck of a lot faster (cheaper) to just toss the old paper element & drop in a new one.