PCV valve
07-06-07, 06:30 AM
#2
Super Moderator
I looked at a Sienna down here a while back and it appears to be in this same general location as on my RX300, but yours should be straigther and not angled using a metal piece and there should be a hose of course connecting it to the side of the intake manifold.
Just to the left of the top of the intake manifold.
Just to the left of the top of the intake manifold.
07-06-07, 07:44 AM
#3
I read that the 07 RX350's had issues on PCV's. A squeeking sound can be heard and turns out to be blocked PCV.
07-06-07, 09:27 AM
#4
Super Moderator
We also have some minor issues with the PCV valves on our RX300s. They were redesigned for 2001-2003 models to be straighter and incorporate a lower metal piece (not sure if there is a picture anywhere offhand), but a Sienna that my uncle and I were working on a few weeks back with the 3MZFE had something similar. They also get plugged up after a while and I have advocated replacement, they are cheap (under $10 USD unless Lexus decided to up the price last time I checked).
One of the modifications that I plan to do soon is an oil catch tank from the crankcase vent hose (hose that hooks up into the air intake after the MAF sensor along with the PCV valve. These two devices recirculate oil vapors, moisture, gunk (god knows what), but all of that ends up playing with octane, combustion, MPG and power (my favorite).
07-06-07, 01:03 PM
#6
How does the seafoam work? I have heard about this countless times.
07-06-07, 02:22 PM
#7
Intermediate
Thread Starter
I've tried searching on here, as it seems that not a lot of LEXUS people use seafoam. Over at the BMW forum, its always a big discussion with lots of threads.
I've used it over many many years and have always recommended it. I put some in my BMW Z3 last night. 2/3's bottle throw the brake booster, and the remaining 1/3 through the gas tank. Even my wife noticed that it runs a lot smoother with idling being dead silent.
Usually I would put 1/3 through brake booster, 1/3 through gas tank and 1/3 in crank case before heading off to get the oil changed. But currently, I have no reason to change the oil just yet. Until I do, i will put in 1/3 of another bottle in.
I also get the spray version, and clean my throttle body out with it. So far no complaints. But be forewarned, sometimes Seafoam causes leaks, especially when you throw it in the crank case. The reason is, over the years carbon build up could have blocked the leakage. But because seafoam removes all that carbon buildup, you could be ready for an expensive repair bill.
I've had no problems with O2 sensors or MAF sensor being ruined by Seafoam.
I've used it over many many years and have always recommended it. I put some in my BMW Z3 last night. 2/3's bottle throw the brake booster, and the remaining 1/3 through the gas tank. Even my wife noticed that it runs a lot smoother with idling being dead silent.
Usually I would put 1/3 through brake booster, 1/3 through gas tank and 1/3 in crank case before heading off to get the oil changed. But currently, I have no reason to change the oil just yet. Until I do, i will put in 1/3 of another bottle in.
I also get the spray version, and clean my throttle body out with it. So far no complaints. But be forewarned, sometimes Seafoam causes leaks, especially when you throw it in the crank case. The reason is, over the years carbon build up could have blocked the leakage. But because seafoam removes all that carbon buildup, you could be ready for an expensive repair bill.
I've had no problems with O2 sensors or MAF sensor being ruined by Seafoam.
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07-06-07, 02:51 PM
#8
Intermediate
Thread Starter
I just figured it out, instead of using the PCV valve to feed it through. I will use the Vacuum Switching Valve PWM. This will take the seafoam directly to the Intake Manifold.
04-13-10, 08:38 AM
#10
Super Moderator
04-13-10, 08:57 AM
#11
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I just replaced mine over the weekend. It's cheap enough (~$6 for the Beck Arnley) & easy enough to do (10 minutes taking my time). I think this is the first time mine was replaced at 60K. It was pretty gummed up & I will probably replace every 30K from now on. BTW - The FRAM one doesn't fit even though it shows it does in the FRAM catalog.
04-13-10, 12:47 PM
#13
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I had Advanced Auto-parts special order it, but some should stock it. With the black plastic cover that covers the PS reservoir on the passenger side removed, you'll be able to see it threaded into the back valve cover. I used needle nose pliers to pinch the hose clamp & a 19mm wrench to remove the PCV valve. When I installed the new one, I just made sure it was snug & didn't over tighten it. The photo Lexmex provided above shows the FRAM type PCV valve, but mine was threaded. However, the photo above does show the same location.
04-13-10, 02:20 PM
#15
Thanks guys. I just ordered a Beck Arnley PCV Value online, should be here in 2 days. I am trying to find the location of the PCV Value on the RX, do I have to remove any other engine parts or pannel to see the PCV Value? Thanks!! Can one of u take a photo of it, and point it out. Thanks!!