1UZ intake separation - actuator removal?
04-20-18, 11:15 AM
#1
Driver
Thread Starter
1UZ intake separation - actuator removal?
In the process of replacing the starter contacts on my GS400. I had surgery recently so am not able to lift the whole intake manifold out for a few more weeks. When trying to separate the upper manifold from lower I felt it sticking at the back, and when I put my hand on the actuator I can feel it rotating ( and presumably opening the intake air control valve) as I lift up. Pushing my current limits to even lift this half off so would rather not struggle with it if it's not doable. My GF could probably help lift either half but she's not going to be able to get the whole thing.
FSM shows removal first but I don't have a gasket and would rather not get one if not needed. Also they show reinstallation as an entire assembly which I couldn't do, so If I have to put the assembly in as one I'll have to call in a favor and get some help to replace anyway, so might as well get help with removal too and skip actuator removal. I'd prefer to get it done on my own if possible though.
I tried looking with a cheap borescope but not enough room to see what's going on. Has anyone removed the upper manifold separately before? Is it possible to do without pulling the actuator?
FSM shows removal first but I don't have a gasket and would rather not get one if not needed. Also they show reinstallation as an entire assembly which I couldn't do, so If I have to put the assembly in as one I'll have to call in a favor and get some help to replace anyway, so might as well get help with removal too and skip actuator removal. I'd prefer to get it done on my own if possible though.
I tried looking with a cheap borescope but not enough room to see what's going on. Has anyone removed the upper manifold separately before? Is it possible to do without pulling the actuator?
04-20-18, 02:17 PM
#2
https://www.clublexus.com/forums/mai...-on-gs400.html
https://goo.gl/images/Ns3QHS
https://www.clublexus.com/forums/gs-...0-starter.html
https://goo.gl/images/Ns3QHS
https://www.clublexus.com/forums/gs-...0-starter.html
Last edited by MikeFig82; 07-26-18 at 10:27 PM.
04-20-18, 05:41 PM
#4
As you can see the picture on the post's. You can take it out as one piece. I did it many years ago as far I a can remember. I didn't remove the actuator. The whole manifold is about 15-20lbs in overall weight. Just make sure you lift straight up. It's been about 4 years ago since I did it.
04-20-18, 08:46 PM
#5
Driver
Thread Starter
Again...I just had surgery. I cannot lift the whole manifold assembly. If I could, this thread wouldn't exist. I'm only asking about the actuator in the context of removing the UPPER manifold from lower, not the whole assembly. Anyone?
04-23-18, 10:47 AM
#7
Driver
Thread Starter
Future searchers, yes, you do have to remove the actuator to get the upper intake off. There is 1.25" of vacuum valve underneath the lower manifold and less room than that to rear wire loom etc, even after loosening it. There is no way the vacuum valve will clear without taking it off.
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04-23-18, 12:25 PM
#8
Instructor
I’ve done about ten starter jobs on UZ motors, not once have I separated the upper plenum from the lower intake, and never removed the ACIS actuator.
The whole intake, upper plenum and lower intake gets removed from the heads as one unit.
I think if your adding unnecessary work by separating the plenum from the lower intake.
If I were you I would have had a helper or two lift the whole intake. It’s just not very feasible to separate them.
Good luck.
Last edited by FrankT; 04-23-18 at 01:22 PM.
04-23-18, 01:37 PM
#9
Driver
Thread Starter
It's already off, I reconnected them had a helper lift. I had both gaskets so if the actuator could have stayed on it would've added less than 10 minutes. As is I agree it's not worth the hassle unless absolutely necessary, which it would've been for me if I couldn't get a helper to come by.
04-25-18, 08:38 AM
#10
I’m in the process of making the plastic intake from a 2005+ 2UZ fit onto my engine, mostly for that exact reason: the stock intake is too damn heavy.
There are other reasons too, like my actuator VSV being dead, and fuel injectors needing cleaning/replacing, but the significantly lower weight will be a nice bonus.
There are other reasons too, like my actuator VSV being dead, and fuel injectors needing cleaning/replacing, but the significantly lower weight will be a nice bonus.
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