Notices
86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

What Is This?

Old 05-05-2019, 08:10 AM
  #1  
Registered User
Thread Starter
 
GreasyFingerz's Avatar
 
Join Date: Apr 2019
Location: California
Posts: 26
Likes: 0
Received 3 Likes on 2 Posts
What Is This?


I was pulling out some vacuum lines and removed this from the rear of the upper plenum. There were only 2 vacuum lines connected to it. Should there be a third one or should it be plugged up? Truck is an 89 pick up 4x4 22re 5 speed. California emissions.
GreasyFingerz is offline  
Old 05-05-2019, 09:07 AM
  #2  
Registered User
 
RAD4Runner's Avatar
 
Join Date: Mar 2012
Posts: 5,892
Received 87 Likes on 71 Posts
Exactly where did you remove it from?
I see one on mine. 2 lines to it, the third plugged. Does your truck run with it unplugged?
RAD4Runner is offline  
Old 05-05-2019, 09:20 AM
  #3  
Registered User
Thread Starter
 
GreasyFingerz's Avatar
 
Join Date: Apr 2019
Location: California
Posts: 26
Likes: 0
Received 3 Likes on 2 Posts

That little hole is were I unthreaded it, at the back of the intake manifold. Right now I'm trying to diagnose a rough idle and I'm wondering if that third hole is the problem. It was unplugged when I removed it
GreasyFingerz is offline  
Old 05-05-2019, 09:43 AM
  #4  
Registered User
 
RAD4Runner's Avatar
 
Join Date: Mar 2012
Posts: 5,892
Received 87 Likes on 71 Posts
Originally Posted by GreasyFingerz View Post
That little hole is were I unthreaded it, at the back of the intake manifold. Right now I'm trying to diagnose a rough idle and I'm wondering if that third hole is the problem. It was unplugged when I removed it
Cool.
Yes, most likely the unplugged port is the problem. That's a big vacuum leak. That unused port could be used for added things like a vacuum gage. For now, connect a short hose to it, fold other end onto itself and tie-wrap. That would be an effective plug.
I'd call that thing a vacuum manifold.

Last edited by RAD4Runner; 05-05-2019 at 09:44 AM.
RAD4Runner is offline  
Old 05-05-2019, 09:53 AM
  #5  
Registered User
 
Join Date: Sep 2007
Location: San Francisco East Bay
Posts: 6,607
Likes: 0
Received 106 Likes on 94 Posts
C'mon guys. These parts have names. Strange ones, but who am I to judge.

Filter, Gas, No. 1 https://parts.lakelandtoyota.com/p/T...091711027.html

That part is just a port for vacuum to run the PAIR, A/C Idle Up, Fuel Pressure Up, Cruise Control and ADD. If you don't have all of those, you may only be using two of the three ports. In which case the third port MUST be plugged or you just have a big vacuum leak.

Dorman makes an inexpensive assortment of caps
Amazon Amazon
that you can get at most auto parts stores. Or you can fold over a piece of vacuum hose as a temporary fix. Assuming you have a piece of vacuum hose, and you're not making a special trip to buy it.
scope103 is online now  
The following users liked this post:
RAD4Runner (05-05-2019)
Old 05-05-2019, 11:08 AM
  #6  
Registered User
Thread Starter
 
GreasyFingerz's Avatar
 
Join Date: Apr 2019
Location: California
Posts: 26
Likes: 0
Received 3 Likes on 2 Posts
Thanks for the info! I'll plug that up and see how it runs. This truck is bare bones, so no AC or cruise which would explain the extra vacuum port.
GreasyFingerz is offline  
Old 05-05-2019, 11:21 AM
  #7  
Fossilized
Staff
iTrader: (6)
 
dropzone's Avatar
 
Join Date: Oct 2005
Location: PNW
Posts: 19,180
Received 44 Likes on 41 Posts
i know you now know what this is but did your truck have the vacuum diagram under the hood?
dropzone is offline  
Old 05-05-2019, 09:39 PM
  #8  
Registered User
Thread Starter
 
GreasyFingerz's Avatar
 
Join Date: Apr 2019
Location: California
Posts: 26
Likes: 0
Received 3 Likes on 2 Posts
Originally Posted by dropzone View Post
i know you now know what this is but did your truck have the vacuum diagram under the hood?
Yes, its on the hood.
GreasyFingerz is offline  
Old 05-06-2019, 08:01 AM
  #9  
Registered User
Thread Starter
 
GreasyFingerz's Avatar
 
Join Date: Apr 2019
Location: California
Posts: 26
Likes: 0
Received 3 Likes on 2 Posts
Originally Posted by RAD4Runner View Post
Exactly where did you remove it from?
I see one on mine. 2 lines to it, the third plugged. Does your truck run with it unplugged?
Could you possibly show me a picture of the third plugged hole? I'm curious to see what its supposed to look like.
GreasyFingerz is offline  
Old 05-06-2019, 11:00 AM
  #10  
Registered User
iTrader: (-1)
 
Join Date: Dec 2012
Location: Colorado
Posts: 4,274
Likes: 0
Received 82 Likes on 80 Posts
Originally Posted by GreasyFingerz View Post
Yes, its on the hood.
The gas filter is near the center on all the ones I've seen.

It will show if it had one, two or all three nipples used in the system.

The third one on my RET is for the digital dash boost guage.

I don't recall what is used on the 94.

The unused ones just have a rubber cap on them, you can get these in an assortment from the parts store. The ports are all the same, it won't matter which you put the cap onto.
Co_94_PU is offline  
Old 05-06-2019, 11:15 AM
  #11  
Registered User
 
Join Date: Sep 2007
Location: San Francisco East Bay
Posts: 6,607
Likes: 0
Received 106 Likes on 94 Posts
By "near the center," I assume co_94_PU is referring to the center of the vacuum sticker.
Like these:


On my '94 with the 3VZE, the sticker doesn't show the ADD or the Cruise Control. So I have all three ports in use, even though the sticker only shows two.

Last edited by scope103; 05-06-2019 at 11:17 AM.
scope103 is online now  
Old 05-06-2019, 03:24 PM
  #12  
Registered User
iTrader: (-1)
 
Join Date: Dec 2012
Location: Colorado
Posts: 4,274
Likes: 0
Received 82 Likes on 80 Posts
Well I obviously need to get a reprinted sticker..


Tool this picture then started to wipe the smutz off and the print came with it..

These show the emissions stuff only iirc ??

I have the cruise control, the digital dash, and vacuum tank hooked to my gas filter.

Top is CC, bottom is dash gauge, and the one hiding is the vacuum can (tee's off to things like the FP regulator).
Co_94_PU is offline  
The following users liked this post:
old87yota (05-06-2019)

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: