Vacuum line missing - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



Welcome Enthusiast! If you already own a Chevy TrailBlazer or GMC Envoy or perhaps thinking of purchasing such a vehicle, then you have come to the best TrailBlazer and Envoy site on the net! Rainier, Bravada, Ascender, and 9-7x owners welcome too!

You are currently viewing our site as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to search and post topics, communicate privately with other members, respond to polls, upload content, and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.
Join Today!
Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain

02-09 Vortec 4.2L I-6 Engine and Drivetrain Q&A forum for engine and drivetrain repairs/modifications/tuning.

TrailVoy.com is the premier GMC Envoy Forum on the internet. Registered Users do not see the above ads.
 
 
Thread Tools
  #1  
Old 01-19-2007, 04:06 PM
Mud's Avatar
Mud Mud is offline
Junior Member
 
2002 Chevy TrailBlazer LT
4.2L I6 4X4
Join Date: Jun 2006
Location: Daleville, VA
Posts: 52
Vacuum line missing

I just did the throttle body cleaning and while I was in the middle of it I noticed I had a missing vacuum line. I'm not sure where it goes.. anyone tell me? I'm wondering if this has to do with my engine every once in a while almost stalling when I come to a stop.

__________________
MagnaFlow Exhaust, K&N Intake, Fuzion XTI's

http://www.myspace.com/mudfrogk5
Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 01-19-2007, 04:23 PM
rbarrios's Avatar
rbarrios rbarrios is offline
TrailVoy Guru
 
2003 Chevy TrailBlazer LS
Pewter Metallic 4.2L I6 2WD
Join Date: Sep 2004
Location: west covina
Posts: 5,267
the stalling- are you running your AC and coming to a stop when it does this?
Quick reply to this message
  #3  
Old 01-19-2007, 04:31 PM
Mud's Avatar
Mud Mud is offline
Junior Member
 
2002 Chevy TrailBlazer LT
4.2L I6 4X4
Join Date: Jun 2006
Location: Daleville, VA
Posts: 52
More then likely yes but I can't say I'm 100% positive. It's never actually stalled it just drops down to ~ 100 RPM then it kicks up again. What are you thinking the problem could be?
__________________
MagnaFlow Exhaust, K&N Intake, Fuzion XTI's

http://www.myspace.com/mudfrogk5
Quick reply to this message
  #4  
Old 01-19-2007, 04:34 PM
TrailBlazer LS's Avatar
TrailBlazer LS TrailBlazer LS is offline
Senior Member
 
2004 Chevy TrailBlazer LS
Silver Green Metallic 4.2L I6 4X4
Join Date: Nov 2006
Location: Iowa
Posts: 683
My 04 I6 has a vacum plug on it. So it does nothing on the 04's i don't know if your 02 is the same. I don't know about the stalling. Sorry. Good luck. Mark.
__________________
4x4. G80. 3.73's. K&N fipk2. PCMforless tuned. Dyno Max ultra flow mufflers. Debadged. Sold 5-3-08.
Quick reply to this message
  #5  
Old 01-19-2007, 05:03 PM
MTPockets's Avatar
MTPockets MTPockets is offline
TrailVoy Alumni
 
2005 Chevy TrailBlazer LS
4.2L I6 4X4
Join Date: Feb 2006
Location: Buffalo, NY
Posts: 2,024
I think I heard somewhere that vac stub powers an HVAC actuator for EXT models. Not sure though. My 2005 LS has a cap over it. Mine doesn't appear to pull a vacuum with the cap removed, but I'd cap it anyway. You can get rubber caps in bulk hardware depts or auto stores.

Joel
__________________
2005 Trailblazer LS 4x4, summit white. Adds: Ventshades and LOTS of extra adhesive added for durabilty.
Quick reply to this message
  #6  
Old 01-19-2007, 05:44 PM
rbarrios's Avatar
rbarrios rbarrios is offline
TrailVoy Guru
 
2003 Chevy TrailBlazer LS
Pewter Metallic 4.2L I6 2WD
Join Date: Sep 2004
Location: west covina
Posts: 5,267
I had a problem on my 03.
Where at stops- and slow turns- with AC on, would couse the engine to idle erratically, or sometimes shut off.
If stationary. I could see the RPMS be normal at 600 with AC off. Turn AC on and RPMS would go to about 100-200, engine vibrate a bit, then rush up to about 1000, back down to 100 or so, and up.....it went on like this as long as the AC was on. You could heard the AC compressor cycling on and off too. when going faster- the RPMs would not move as much, but I could feel the engine losing and gainin power.
Turns out I had changed battery few days before.
The fix- disconnect battery, clean throttle body, and reconnect battery after at least 30 min.
this cleared memory or bad learned settings. When I used it again after the above, it worked like new. no drop in RPM when AC is turned on.
try it.
put vehicle in Drive. turn on AC, and note the tach..... whats it do?

in my case. installing battery cause it to lose memory, when I used the AC again, it learned settings with a dirty throttle body and it didnt know what to do. When AC came on- it tried to compensate by adding more gas- but butterfly was slow... so engine almost dies, by the time the added gas does reach- it causes the surge, but the conpressors has shut off because it sensed the engine wanting to turn off.....
so thats why it cycles up and down.... like its stuck in a loop.
Quick reply to this message
  #7  
Old 01-19-2007, 06:17 PM
blktbon20s's Avatar
blktbon20s blktbon20s is offline
No longer with us
 
2002 Chevy TrailBlazer SS
Jet Black 4.2L I6 4X4
Join Date: Jan 2006
Location: Suffolk,New York
Posts: 6,583
Quote:
Originally Posted by Mud View Post
I just did the throttle body cleaning and while I was in the middle of it I noticed I had a missing vacuum line. I'm not sure where it goes.. anyone tell me? I'm wondering if this has to do with my engine every once in a while almost stalling when I come to a stop.

you know that skinny hose u have to the intake, well that little 90 degree vacuuum line i connected it to where u r wondering what it is
look at my pic

__________________
[URL]http://www.cardomain.com/ride/2092427[/URL]
Trailvoy has the one and only GG AKA GiG
Quick reply to this message
  #8  
Old 01-19-2007, 06:21 PM
ieatglue's Avatar
ieatglue ieatglue is offline
TrailVoy Guru
 
2003 Chevy TrailBlazer LT EXT
Onyx Black 4.2L I6 4X4
Join Date: Aug 2005
Location: Toronto, Ontario
Posts: 8,770
If you put your finger over it, you'll feel it sucking in air and that raises your RPM by a bit. On my EXT, there's a hose that's connected to it and it runs all the way to the rear left firewall. I think it's a vacuum line for the EGR valve or something
__________________
Horsepower is how fast you hit a wall, Torque is how far you take the wall with you

THESE BIG RED LETTERS HELP ME FIND MY POST
Quick reply to this message
  #9  
Old 01-20-2007, 03:15 PM
cliffwilson's Avatar
cliffwilson cliffwilson is offline
Junior Member
 
2005 Chevy TrailBlazer LS
Summit White 4.2L I6 2WD
Join Date: Oct 2005
Location: Orange Park, FL
Posts: 86
The port pulls vacuum on my 05. I've checked it with a gauge. Therefore, it should be capped. While it serves no functional purpose on my TB, it's a convenient point for vacuum testing.
Quick reply to this message
  #10  
Old 01-24-2007, 02:13 PM
rbarrios's Avatar
rbarrios rbarrios is offline
TrailVoy Guru
 
2003 Chevy TrailBlazer LS
Pewter Metallic 4.2L I6 2WD
Join Date: Sep 2004
Location: west covina
Posts: 5,267
blktbon20- I noticed on mine- that little 90 degree thingy is connected to the 4200 piece of plastic- and my other nipple is capped.
Quick reply to this message
Sponsored Links
Advertisement
 
 

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum forums, you must first register.

Please enter your desired user name, your email address and other required details in the form below.
(Only letters, numbers, dashes and underscores are permitted for user names)
The user name that you choose is permanent and can never be changed.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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 Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Vacuum line missing? MDNUC General 4 06-14-2008 05:03 PM
Very odd vacuum issue... neelskit OEM Issues 4 05-05-2008 09:09 PM
Missing vacuum line? aw OEM Issues 6 12-09-2007 11:43 AM
The adventures of glue and his power steering pump ieatglue 02-09 Vortec 4.2L I-6 Engine and Drivetrain 25 12-06-2006 09:22 PM


» Sponsors

Advertising Info

All times are GMT -4. The time now is 12:39 PM.


Chevy TrailBlazer and GMC Envoy Enthusiasts - Copyright 2004 - 2009 All Rights Reserved.
All trademarks referenced herein are property of their respective owners.
RSS Feed