4g61t.org

Specializing in the 3g CSM
It is currently Sun Oct 26, 2025 9:36 am

» »

All times are UTC-05:00



Post new topic  Reply to topic  Page 1 of 1
  [ 4 posts ] 
  Print view Previous topic | Next topic 
Author Message
nodents
 Post subject: strange vacuum readings
PostPosted: Sat Nov 12, 2005 11:59 am 
Offline
CSM Junkie

Joined: Fri Aug 09, 2002 9:31 pm
Posts: 421
Location: Kingston, Ontario, Canada
This has been happening for a long time, just never posted about it. Sometimes vacuum will be good, 12-15 @ idle, dropping to 19-20 when decelerating in gears. Then if car is shut off and restarted it will change to only 6-9 @ idle and 12-15 decel. or so. Or if restarted will go back to normal or vice versa. Doesn't seem to change hot or cold. Have chacked for boost leaks. Throttlebody seals? Anybody else got this symptom?
Top
   
Reply with quote  
Flying Eagle
 Post subject:
PostPosted: Sat Nov 12, 2005 4:36 pm 
Offline
The Silent Administrator
User avatar

Joined: Wed Dec 24, 2003 3:32 pm
Posts: 9539
Location: Ottawa, ON, Canada
Have you tried an alternate quality gauge to corroberate this phenomenon as being related to the car and not the test equipment? Passing thought....
Top
   
Reply with quote  
nodents
 Post subject:
PostPosted: Sat Nov 12, 2005 7:08 pm 
Offline
CSM Junkie

Joined: Fri Aug 09, 2002 9:31 pm
Posts: 421
Location: Kingston, Ontario, Canada
glad your passing thought and not something else :o
Top
   
Reply with quote  
unior
 Post subject:
PostPosted: Sat Nov 12, 2005 8:54 pm 
Offline
CSM Junkie
User avatar

Joined: Mon Apr 19, 2004 8:16 am
Posts: 705
Location: Lancaster, PA
make sure the signal line to the gauge isn't pinched, torn, collapsing under vacuum, etc.

I had a cheap rubber vacuum line running to a gauge before that had a pinhole that wouldn't leak until you made enough boost or vacuum to cause it to pull air through the tiny hole.

also...would EGR affect vaccuum readings? just throwing out ideas

_________________
90 GGSX
89 YX-600
92 Laser AWD
Top
   
Reply with quote  
Display posts from previous:  Sort by  
Post new topic  Reply to topic  Page 1 of 1
  [ 4 posts ] 

» »

All times are UTC-05:00

Who is online

Users browsing this forum: No registered users and 14 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Limited