E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards 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 post topics, communicate privately with other members (PM), 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.

Go Back   E46Fanatics > E46 BMW > General E46 Forum

General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

Thread Tools Search this Thread Rate Thread Display Modes
Old 02-18-2013, 11:46 AM   #1
Registered User
Join Date: Aug 2008
Location: USA
Posts: 43
My Ride: 2005 330 Ci
Gauge Vacuum Test

Anybody tried a gauge vacuum test with good results: steady needle at idle, drop in vacuum once rpm is increased to 2500? If yes, where is the gauge hose supposed to be connected ?

Please advise. Many thx.

Last edited by FutureFast; 02-18-2013 at 11:47 AM.
FutureFast is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 02-18-2013, 12:33 PM   #2
Registered User
Join Date: Sep 2012
Location: Old Greg's Cavern
Posts: 12,650
My Ride: '13 128i, '04 330Ci
You can read vacuum pressure from the OBD computer using Torque Pro if you have an Android device.
WDE46 is offline   Reply With Quote
Old 02-18-2013, 03:00 PM   #3
Registered User
Join Date: Aug 2008
Location: USA
Posts: 43
My Ride: 2005 330 Ci
May be ... But I was thinking in more of troubleshooting terms. There are various places in the manifolds where I can place the gauge hose, however I am not sure what the correct readings should be. Let's say you have a CCV that doesn't work as it should? How do you troubleshoot that? (I don't believe much in the bag over oil cap "technique" - that can only indicate that you may have a failed or somewhat working CCV). Or, how can you test for the jet sucking pump failure/correct reading? Etc ...

True, at the same time, I don't think anybody ever tried on this forum since I searched and hence the posting.

Thx a whole bunch anyway.
FutureFast is offline   Reply With Quote
Old 02-18-2013, 03:41 PM   #4
Registered User
Join Date: Mar 2007
Location: the barnyard
Posts: 2,458
My Ride: '79 Massey Ferguson
A smoke machine is really the best way to test for vacuum leaks. I would say anywhere on the intake tract post throttle body would be acceptable, and you're probably looking for somewhere around 18-20mmHg on the gauge at a hot idle.

There are only two failure modes for the CCV afaik: clogged to the point that it obstructs the vacuum into the crank case (what the "bag over hole" technique is testing for, and broken plastic/loose connections that create a leak.
lcoleman is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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
Censor is ON

All times are GMT -5. The time now is 05:54 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
(c) 1999 - 2016 performanceIX Inc - privacy policy - terms of use