OK so I have the Upper Manifold off getting the injectors cleaned. Other than all the vacuum lines and the VCV, which of this stuff under here should I be replacing while it's open. All? 1994 FZJ80
Under Manifold Parts
- Thread starter Reachej
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this I'm interested in,
I replaced all the cheap stuff (like the three way) and vacuum lines because I didn't want to do it later and it's not expensive. Looks like some of your vacuum lines have been changed (the ones with "Hose #") and some have not (the ones with the #0 and #1 on them).
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Yes I plan on doing the hoses, three way, check valves and VCV for sure. Was wondering if anyone has any insight as to the VSVs' life expectancy. I'll probably just do those too. Looks like the "Duty Vacuum Valve" and "Vacuum Valve Assembly" aren't available anyway.
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I just tested VSV per FSM and it passed so I didn't worry about it. I know VCV has a simple FSM test but I think there may be one more component test if I remember correctly. This is 97 LX450, may be different from your FSM.
Replace all with OEM parts, do not use aftermarket vacuum hoses.
FWIW some part numbers that might help:
The 3.5mm OEM hose is available in various lengths
Part number for the 3.5mm vacuum hose is 90999-92003 (2') or 90999-92008 (~9' feet)
There's also a section of fuel hose (95337-06020 cut to fit) that runs on the top of the Throttle body, IME it becomes rock hard and has to be cut to remove.
Another longer section of fuel vapor hose (for the vapor canister is 90999-92006
(double check all before ordering)
Kinda hard to read (helps to increase screen magnification)
While the manifold is off is a good time to clean/replace the EGR valve if you're keeping it as well as all the large and small ports of the throttle body itself.
Could also clean the baked on carbon/varnish in/on the upper intake especially inside the tunnel for the EGR gases that runs inside the top of the intake.
FWIW some part numbers that might help:
The 3.5mm OEM hose is available in various lengths
Part number for the 3.5mm vacuum hose is 90999-92003 (2') or 90999-92008 (~9' feet)
There's also a section of fuel hose (95337-06020 cut to fit) that runs on the top of the Throttle body, IME it becomes rock hard and has to be cut to remove.
Another longer section of fuel vapor hose (for the vapor canister is 90999-92006
(double check all before ordering)
Kinda hard to read (helps to increase screen magnification)
While the manifold is off is a good time to clean/replace the EGR valve if you're keeping it as well as all the large and small ports of the throttle body itself.
Could also clean the baked on carbon/varnish in/on the upper intake especially inside the tunnel for the EGR gases that runs inside the top of the intake.
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clear out any clogs in the vacuum hard lines and the egr port as mentioned above. Also wrap your harness and replace the clip if necessary. Also having the upper intake off makes it significantly easier to change out the PHH and fuel filter if those haven't been done yet.
Consider this "while your in there"
Problem with silicone vacuum hoses is that they don't fuse or stick to the metal pipes/nipples so you may have to add a small hose clamp
for each end of that type of hose to ensure a tight fit. IME the OEM vacuum hoses last decades if undisturbed. IIRC the OEM breather and PCV hoses are FKM rubber (Fluoroelastomer) similar to Viton.
for each end of that type of hose to ensure a tight fit. IME the OEM vacuum hoses last decades if undisturbed. IIRC the OEM breather and PCV hoses are FKM rubber (Fluoroelastomer) similar to Viton.
Personally for me.... no way I will ever again use silicone hoses.
I've been down that road with my old 22re, still cant believe it kept running great even without coolant, after swapping back to rubber hoses no more coolant leaks, as Kernal mentioned, silicone will not fuse to the metal connection surfaces
mudgudgeon
Resident galah
For the few dollars cost, replacing all rubber hose is a no brainer.
Toyota sells the vacuum hose. Cut it to length yourself.
I have used aftermarket hose, but had some trouble finding a suitable size.
The I/D and wall thickness was difficult to find a match for, and rubber quality definitely does not feel the same as OEM
Toyota sells the vacuum hose. Cut it to length yourself.
I have used aftermarket hose, but had some trouble finding a suitable size.
The I/D and wall thickness was difficult to find a match for, and rubber quality definitely does not feel the same as OEM
