The banner above is an advertisment - if it asks you to download software, please ignore.
Site News - 7/1: Members: Log In to See Fewer Ads! | 5/28: SAAB Evolutions/TSN T-Shirts $14
[General | Members | C900 | 9000 | NG900 & OG93 | 93 | 95 | NG95 | 99 | Sonett | Vintage Models | Clubs | Other Cars | FAQs | Gifts | Member Photo Galleries | Member Directory | Classifieds | Manuals | *Buddy Registry | *Mileage Registry | Polls | What's New | Raffle | Photo of the Month | Sponsors]

9000 Bulletin Board
1985-1998 [Subscribe to Daily Digest]
(Search Author's Posts: e.g. Keyword:username)*Members Only

[Main 9000 Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Re: New BPC valve and driver transistors
Like This Post: - Subscribe to Daily Digest for this Bulletin Board
Posted by BobS (more from BobS) on Sun, 12 Feb 2012 17:21:36 Share Post by Email
In Reply to: thinking about buying a new BPC valve but...., SMP, Sun, 12 Feb 2012 12:25:10
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup

If a driver transistor is bad, you will always get over boost or base boost, the valve can not control boost. A bad transistor is either shorted or open, they fail in that order, although enough current can cause both to happen milli seconds apart. I maintain transistors do not fail unless a coil is shorted or some other short occurred. Do not spark around with anything connected to the control. With the key off, one at a time measure the resistance from the outer BPV connector contacts to battery ground. Be careful with the contacts, do not insert anything thicker than .030" between the fingers, or the fingers can be distorted resulting in poor contact. The resistance should be greater than about 500,000 Ohms (.5 M Ohms). Anything less is suspect. Theoretically a shorted transistor should read near zero Ohms, but this is not always the case due in part to the low voltage applied by the Multimeter and the short maybe to the circuit driving the transistor. To check the BPC valve, cover the center port and blow in either end port, no air should go through the valve either way. It could be you got some poor valves, some of the OEM parts valves would not last long, about what you experienced. A shorted transistor can burn a coil of a replacement valve, so before a valve is replaced, the transistors should be checked.

4.8 Ohms on both coils of one valve is a bit puzzling, the resistance of a burned coil will go up, but with both same, it maybe a meter issue. What is the resistance between the outside contacts?, should be 9.6 Ohms. Other than the 4.8 Ohms, what was wrong with that valve? High resistance on both coils could potentially affect valve function, especially when the coils get hot and the resistance increases.


posted by 71.33.80...
Posts in this Thread:
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup
Post a Followup

No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.

Name: Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
E-Mail: (Optional)
Re-Enter E-Mail: (Confidential & Secure - Not revealed to other users!)
Note: Please check your spam folder for BB responses.

Subject:

Posting rules are simple - No for sale/wanted ads may be posted here - use the site classifieds.
You may not cross-post your message to multiple BBs.
Not permitted: political/religious topics and being disrespectful (personal attacks, insults, etc...).
 Site Members do not see any red text, inline ad links, bottom of page anchor ads, box ads, or anti-spam check.

Message: (please no for sale/wanted classifieds - post those in the Saabnet.com Classifieds)
Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).

Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post above, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).
Optional Link: (e.g. http://www.saabnet.com/)
Link Title: (Optional)
Optional Photo/Image Link: (e.g. http://www.saabnet.com/img.jpg)
Photo/Image to Upload: (Please be patient while file uploads)



StateOfNine.com
SaabClub.com
Jak Stoll Performance
M Car Covers
Ad Available

The content on this site may not be republished without permission. Copyright © 1988-2024 - The Saab Network - saabnet.com.
For usage guidelines, see the Mission & Privacy Notice.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]

Random Saabnet.com Member Gallery Photos (Click Image)
This is a moderated bulletin board - Posting is a privilege, not a right. Unsolicited commercial postings are not allowed (no spam). Please, no For Sale or Wanted postings, SERIOUSLY. Classifieds are to be listed in The Saab Network Classifieds pages. This is a problem solving forum for over 250,000 Saab owners, so expect to see problems discussed here even though our cars are generally very reliable. This is not an anything goes type of forum. Saabnet.com has been a moderated forum since 1988. For usage guidelines, see the Saabnet.com Mission and Purpose Page. Please remember that you are not anonymous. Site Contact | Site Donations | Other Sites by SP - Poverty2Prosperity.org | Run Club Menlo Park | ScreenBot


Site Members do not see red text instructions, bottom of the page anchor ads, or box ads.
Click here to see all the Site Membership Benefits!