Go Back   Chrysler Forum - Chrysler Enthusiast Forums > General Chrysler Forums > General Tech
Sign in using an external account
Register Forgot Password?
Search

Welcome to the Chrysler Forum - Chrysler Enthusiast Forums.
If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 12-12-2008, 05:35 PM
Member
 
Join Date: Nov 2007
Posts: 41
Default 3.5-Vacuum Leak

It seems as though my high rev/backfiring troubles may be tied to a vacuum leak. When I removed the upper-to-lower plenum gasket there was no kind of sealant or adhesive material present. Should I put anything like that on there? Compression is 120+ in all cyclinders. What could be the cause of such a lack of vacuum? Thanks to all in advance.
This ad is not displayed to registered members.
Register your free account today and become a member on ChryslerForum!
Reply With Quote
  #2  
Old 12-13-2008, 04:59 PM
dcotter0579's Avatar
Senior Member
2002 Chrysler Sebring
My Garage
 
Join Date: May 2008
Location: Detroit suburb
Posts: 3,385
Default RE: 3.5-Vacuum Leak

Don't put sealant on there. Inspect the sealing surfaces carefully for nicks and gouges. Inspect the gaskets for integrity. Replace any that are doubtful. Inspect all the hoses for cracks and hardening.
Inspect the check valve at the brake booster for cracks or leaks. Put a finger over each hose connecrion to check for leaks while the engine is running.
Check the EGR and PCV circuits.
You may be able to find or confirm a vacuum leak by listening through a tube. Put one end of the tube close to your ear and check suspected spots with the other end of the tube.
Spray carb cleaner on a suspected area. If the leak momentarily stops, it's confirmed.
Your upper manifold may be warped and not mating properly with the lower manifold. If you can get hold of a precision straightedge, check the flatness of the mating surfaces.
There's a proper sequence for removing and tightening the bolts. Make sure you follow it properly.
__________________
Engineer and current owner of two Sebrings.
Reply With Quote
  #3  
Old 12-14-2008, 06:08 PM
Member
 
Join Date: Nov 2007
Posts: 41
Default RE: 3.5-Vacuum Leak

O.K., the lack of vacuum seems to have come from the egr tubes to the manifold not being connected properly. But the idle is still at 3800! How exactly do these tubes connect to the manifold? The Haynes manual shows a silicone gasket between the tubes and the plenum. Don't recall them when I took it apart. How do the gaskets attach? Thanks.
Reply With Quote
  #4  
Old 12-15-2008, 04:48 PM
dcotter0579's Avatar
Senior Member
2002 Chrysler Sebring
My Garage
 
Join Date: May 2008
Location: Detroit suburb
Posts: 3,385
Default RE: 3.5-Vacuum Leak

It might be helpful to take a look at the parts catalogue for your specific vehicle. Go to chryslerparts.net and pull up the parts book for your model and year. Search for the EGR system ant you should find an exploded view of your system. From that you may be able to figure out what goes where.
Sounds like you are getting close to getting it fixed. Let us know how it comes out.
__________________
Engineer and current owner of two Sebrings.
Reply With Quote
  #5  
Old 12-16-2008, 04:45 PM
Member
 
Join Date: Nov 2007
Posts: 41
Default RE: 3.5-Vacuum Leak

Allright, I finally found the source of the vacuum leak. It was missing silicone gaskets that seal the egr tubes in the plenum. Thanks to everyone for their patience with me and their advice and solutions to my troubles!
Reply With Quote
  #6  
Old 12-17-2008, 10:09 PM
dcotter0579's Avatar
Senior Member
2002 Chrysler Sebring
My Garage
 
Join Date: May 2008
Location: Detroit suburb
Posts: 3,385
Default RE: 3.5-Vacuum Leak

Hooray!!!
How is she running?
__________________
Engineer and current owner of two Sebrings.
Reply With Quote
  #7  
Old 12-18-2008, 03:14 PM
Member
 
Join Date: Nov 2007
Posts: 41
Default RE: 3.5-Vacuum Leak

It was running good but just now it started stalling for no reason. At first it threw a 1294 code but now there are no codes. Going to disconnect the battery and let the computer reset. Hopefully thats it.
Reply With Quote
  #8  
Old 05-06-2011, 06:24 AM
Member
2000 Chrysler LHS
 
Join Date: May 2011
Location: San antonio
Posts: 59
Default

maybe the pcv is craked
Reply With Quote
Old 05-06-2011, 06:24 AM
 
 
 
Reply



Tags
2000, 2007, 300m, check, chrysler, cruiser, detect, egr, forumchrysler, leak, lhs, pacifica, plenum, pt, vacuum, valve

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are On
Pingbacks are On
Refbacks are On


Advertising

Featured Sponsors
Vendor Directory
Our Sponsors
All times are GMT -5. The time now is 01:31 AM.

Internet Brands, Inc.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO ©2010, Crawlability, Inc.

Emails Backup