Vacuum line Diagram.

[xoemor]

please. someone can give the 1fz-fe Engine Vacuum diagram.

 

[medtro]

You should have one under the hood.

 

[xoemor]

nop , i dont have it . i dont have the oem hood!
thanks

 

[HarleyHetz]

Did you ever get this? If not, I can post a pic of the one off of my '91. I took a pic of it in case it ever got damaged...I'm not sure it would be exactly the same, what year do you have?

 

[SiRaDuDe]

Since you did not specify a year... Here are some diagrams off a '94. If you need schematics let me know.

 

[xoemor]

this is it .
Thanks man , its a 94 too..

 

[xoemor]

i need all the info you can give me.

 

[SiRaDuDe]

Sorry...

Just got back from vacation in Miami...

If you need any other just let me know....

 

[xoemor]

in plain english ., what is the funtion of the vacuum . ?

 

[SiRaDuDe]

Hope this helps you out some

 

[Bsteimel]

i have a lx450 and for the life of me i can't find what happened to the electrical connector to 1 of the VSVs underneath the intake. The EGR connector is blue and it's comes from the bundle with the fuel pressure VSV and the 3 connectors for the throttle body. I think the electrical connector i'm missing is the EVAP VSV. Where is that guy and does anyone know the color?
Does anyone have a vacuum diagram for a 1997 or lx450. It never came with the PAIR system and it's a little different under there

 

[Malleus]

@Bsteimel did you try the FSM? You should have a label on the underside of the hood with the vacuum line routing on it. If not, you can get one from Toyota. Use your VIN and look up the label in the "Body/Interior" section of the electronic parts catalog (EPC) on the PartSouq/Toyota website (I'd recommend bookmarking that page). You can get the part number from there and order the label from anywhere. I don't have a LX450 VIN handy, but this is what it looks like for my '95:

​

FWIW, all these labels were available as of last year (I bought some of them), but are now showing discontinued. Maybe they'll return to production later, or some enterprising someone here will print some on adhesive paper and create his own side business.

You can use a 1995-1997 Land Cruiser FSM for most repairs on the LX450, if you don't have a Lexus FSM handy, but realize there are some significant differences. The EWDs will not be the same; the Lexus has more stuff in the harness, and Toyota moved some things around in the dash. The basic systems needed to drive are the same though: engine, transmission, transfer, axle, and most of the interior. The A/C systems are different, in that Lexus used different controls.

This info is from the 1996 FSM (engine control section), but I think the '96 & '97 are the same. If not, you can find the info in the 1997 FSM. The FSMs are in the Resources section, for free download, along with some other publications which may be of use/interest to you.

From the EWD:

V3 is the VSV for EGR; V4 is the VSV for fuel pressure control:

 

[Malleus]

FWIW, every connector, even the junction connectors, are listed in the EWD sections for the specific systems they describe, at the end of the section.

 

[Bsteimel]

I think I found my problem. I think I have an extra vacuum switch under the intake from a previous owner.
When I got my car there was a vacuum switch dangling inside the intake. From the picture you can see i have 4 switches, 3 with power and 1 without. On the opposite side of the fuel pressure switch there are 2 switches. 1 switch is attached to the intake right above it, the other side is attached to the EGR. The second switch has 1 side open to the air, the other side is attached to the check valve. This is kind of weird from the diagrams. For now it seems to function just fine.

The reason i posted was that I put it all together and the engine wouldn't start. I looked under the intake and realized that the 1 switch didn't have a plug attached and followed this red herring. This was not my problem, I forgot to tighten down the large intake hose coming out of the MAF sensor.

From what I can tell. There should be 3 switches underneath the intake. 1 for the fuel pressure that has a brown plug, 1 for the EVAP that doesn't have a electrical connector and then 1 for the EGR that has a blue connector. I have a 4th connector. I need to reverse engineer this and find out why a previous owner did this. If I had an older model with the PAIR system then this 4th switch would be valid, but on a LX450 I don't even think it should exist. I need to study the diagrams and match it up. Pictures are easier to follow but everyone's pictures are from older models that include the PAIR system.

I have included a picture of the underneath of my upper intake before I started replace things. I swear i put everything back together as it was. The blue electrical connector was attached to the switch that was dangling. That dangling switch is now attached to the bracket, luckily I had a spare screw that fit just right. For future people I used a grounding screw from an electrical outlet.

 

[Bsteimel]

Based on the diagram I'm seeing these potential modifications (red) to bring it in line, but it leaves 1 connection out (Yellow). Does that connection actually lead to the little tip by the grey electrical plug for the EGR temperature sensor, between cylinder 5 and 6 intakes? I always thought something should go into that spout. In that case it would go to the EGR through the intake instead of a long house down and around?

The fact that the EGR switch is open to the air and the check valve is open to the air, is this just misrouted or was this for a specific purpose?
Does this disable the engagement of the EGR valve in someway that doesn't throw an engine code. I have no engine codes with this setup. I can't imagine it would considering people go through a lot of hoops to do that and this is pretty simple. I have no idea why it would be routed a different other then disabling the EGR valve, other then malice.

IS the blue EGR hose also on the wrong side of the switch?
So many questions

 

[Malleus]

This is what it should look like
(a "before" shot of last year's headgasket R&R)

and FWIW, after (thanks, in large part, to CarbonOff):

 

[Bsteimel]

Awesome, thanks!! Very clean. I cleaned mine up the best i could with brushes and some solvent. does NOT look like that. You could eat off those things.

 

[Bsteimel]

This is what it should look like
(a "before" shot of last year's headgasket R&R)

and FWIW, after (thanks, in large part, to CarbonOff):

Awesome, thanks!! Very clean. I cleaned mine up the best i could with brushes and some solvent. Does NOT look like that. You could eat off those things.

Does the EGR go into this spout here in the picture, instead of down and around.

Now the question comes how am I going to reroute these things with everything put back together, ha.

 

[Malleus]

CarbonOff is the deal. And it's a multi-tasker - shop and kitchen.

Yes. Plug the little tube with the vacuum line.

Put it together with the Upper Intake half upside down and flip it over when you're down.

 

[Bsteimel]

Put it together with the Upper Intake half upside down and flip it over when you're down.

Yeah i already did that in original orientation. Not realized until i put it back together that the previous owner may have some things crossed. I think i can squeeze my hand up there and move things around