Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

Reply
 
LinkBack Thread Tools Display Modes
Old 07-01-2019, 06:31 PM   #1
Registered User
 
Join Date: Dec 2018
Location: Houston
Posts: 18
Can Someone Identify This Random Hose?

Decided to clean out my intake as well as the MAF so removed the intake and throttle and I noticed what appeared to be a vacuum life just hanging there which is coming from under the drivers side intake manifold. When sticking my hand around I found this T connector which had another Vacuum line coming off of it as well as a piece of tube which had been blanked off with a screw.



Any ideas what the heck this is for or where the other side of this Vacuum hose goes?

gti13 is offline   Reply With Quote
Old 07-02-2019, 02:30 PM   #2
Registered User
 
Join Date: Aug 2015
Location: Fulshear, TX
Posts: 221
Looks like the check valve line from the intake sleeve.

Check in here:

https://986forum.com/forums/boxster-general-discussions/64576-vacuum-line-clarification.html
dsallean is offline   Reply With Quote
Old 07-02-2019, 02:46 PM   #3
Registered User
 
Join Date: Dec 2018
Location: Houston
Posts: 18
Quote:
Originally Posted by 78F350 View Post
In regard to the vacuum connections, here's that diagram, created with actual parts from a scrapped 2001 2.7L.

Notes:
-This picture shows what connections have to be made, the actual order of connections to the Y fittings (I) and (G) are not critical.
-The Tiptronic cars will have a 4-way connection at (I) or (G) with a line running to a changeover valve on the transmission.

It looks like a mess of tubes and parts, but in function it is fairly simple.
This shows 3 vacuum powered components: SAI, Resonance Flapper, and Fuel Pressure Regulator. Brake booster vacuum system is not shown.
SAI: Vacuum source -> electric change-over valve (E) -> change-over valve (D).
Resonance Flapper: Vacuum source -> electric change-over valve (J) -> vacuum unit (K).
Fuel Pressure Regulator: Vacuum source (B) -> Pressure regulator (C) -> injector valves (A).

Rubber sleeves (L) and (B) are the source of vacuum from the intake. (H) is a check valve. (F) is the vacuum reservoir.
Thanks, after looking over this I am not really sure which part goes where as I have a long thin line connected into part I with part H blanked off and the side of G there was a line coming off not another T connector
gti13 is offline   Reply With Quote
Old 07-02-2019, 03:06 PM   #4
Registered User
 
Join Date: Aug 2015
Location: Fulshear, TX
Posts: 221
this might help as well:

https://986forum.com/forums/boxster-general-discussions/69281-where-does-go-vacuum-valve.html

When I removed mine for cleaning I had the line to the electronic change-over valve just hanging loose and it took a while to locate where it went.
dsallean is offline   Reply With Quote
Old 07-02-2019, 04:11 PM   #5
Registered User
 
Join Date: Dec 2018
Location: Houston
Posts: 18
Quote:
Originally Posted by dsallean View Post
this might help as well:

https://986forum.com/forums/boxster-general-discussions/69281-where-does-go-vacuum-valve.html

When I removed mine for cleaning I had the line to the electronic change-over valve just hanging loose and it took a while to locate where it went.
Okay so Line G is if you have an Automatic transmission? if so I have a 5 speed Manual

L should plug into the passenger side throttle body pipe, ill have to look for this as I dont remember seeing this but I will double check
gti13 is offline   Reply With Quote
Old 07-02-2019, 04:13 PM   #6
Motorist & Coffee Drinker
 
78F350's Avatar
 
Join Date: Jul 2014
Location: Oklahoma
Posts: 2,326
Garage
Quote:
Originally Posted by gti13 View Post
Thanks, after looking over this I am not really sure which part goes where as I have a long thin line connected into part I with part H blanked off and the side of G there was a line coming off not another T connector
Interesting, I'd guess that you don't have a functional SAI system or resonance flapper valve.

Long thin line should probably go from the 3-way to (J) to (K).

The Black end of (H) should connect to the vacuum source (hole in the rubber coupling band on the intake).
__________________
I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
78F350 is offline   Reply With Quote
Old 07-02-2019, 04:30 PM   #7
Motorist & Coffee Drinker
 
78F350's Avatar
 
Join Date: Jul 2014
Location: Oklahoma
Posts: 2,326
Garage
Quote:
Originally Posted by gti13 View Post
Okay so Line G is if you have an Automatic transmission? if so I have a 5 speed Manual
In the diagram, (G) is a 3-way and you should have two 3-way connectors on a 2000 or later manual trans 986. The Tip' will have a 3-way and a 4-way. Your other 3-way should probably be on or near (F), the vacuum reservoir.

Quote:
L should plug into the passenger side throttle body pipe, ill have to look for this as I dont remember seeing this but I will double check
(L) is the rubber coupling on the intake that has a small hole that (H) or a piece of the smaller more rigid tubing can poke into.

The arrow is pointing to (L), where (H) should be connected either directly or with a small piece of tubing:
__________________
I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.

Last edited by 78F350; 07-02-2019 at 04:36 PM. Reason: Added pic from another post
78F350 is offline   Reply With Quote
Old 07-03-2019, 08:48 AM   #8
Registered User
 
Join Date: Dec 2018
Location: Houston
Posts: 18
Thanks so much for your help guys, the line plugged into the small tubing on the passenger rear intake piping

I did notice another open T-connector on the passenger side under the intake mainifold

However I took it for a drive with the new plugs, spark Plug tubes, cleaned maf, new air filter and it revs so smoothly now and doesnt have that dead spot mid rpms, I did previously have a check engine light which so far has not popped up although I have only driven it maybe 10 or 15 miles since.
gti13 is offline   Reply With Quote
Old 07-03-2019, 12:02 PM   #9
Registered User
 
Join Date: Aug 2018
Location: Woodland Wa
Posts: 223
You could do a simple vacuum test. A vacuum gauge costs about $20.00.
Then you will know for sure that you at least have proper vacuum to the intake. Reading should be 19-22 with a steady needle.
blue62 is offline   Reply With Quote
Old 07-09-2019, 10:17 PM   #10
Registered User
 
Join Date: Dec 2018
Location: Houston
Posts: 18
Seems to be driving very well, I put atleast 80 miles on it and no check engine light or lumpy runnings

only problem is I fixed this issue and now the passenger side window has gone out so will be replacing this when the new one arrives later this week
gti13 is offline   Reply With Quote
Old 08-07-2019, 06:05 PM   #11
Registered User
 
Join Date: Dec 2018
Location: Houston
Posts: 18
So I am pretty sure this hose has popped out again and the hesitation is back, it seemed to slip in so easily so I am sure its popped back out again

How do you go about keeping this loose hose inserted in the hole?
gti13 is offline   Reply With Quote
Old 08-07-2019, 06:33 PM   #12
Motorist & Coffee Drinker
 
78F350's Avatar
 
Join Date: Jul 2014
Location: Oklahoma
Posts: 2,326
Garage
Quote:
Originally Posted by gti13 View Post
... How do you go about keeping this loose hose inserted in the hole?
Has the hole in the rubber sleeve that the vacuum hose goes into softened and stretched? Buy a new rubber sleeve: part no 99611068552 for about $25.
Or buy some tubing that is a little bit larger. I think the stock vacuum tubing has a 3.5 or 4 mm outer diameter.
Or just wrap a little piece of tape around the tubing to make it fit the hole more snug.
__________________
I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
78F350 is offline   Reply With Quote
Old 08-08-2019, 10:39 AM   #13
Registered User
 
Join Date: Sep 2005
Location: NorCA
Posts: 13
Quote:
Originally Posted by gti13 View Post
So I am pretty sure this hose has popped out again and the hesitation is back, it seemed to slip in so easily so I am sure its popped back out again

How do you go about keeping this loose hose inserted in the hole?
You can also use a small cable tie to hold the hose in place.

dsjwilson is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 05:02 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page