The infamous APC clicking - Saab 900 Bulletin Board - Saabnet.com


[General | Members | C900 | 9000 | NG900 & OG93 | 93 | 95 | NG95 | 99 | Sonett | Vintage Models | Performance | Detail | Clubs & SOC | Other Cars | FAQs | Gifts | Member Photo Galleries | Member Directory | Classifieds | Service/Mechs | Manuals | *Buddy Registry | *Mileage Registry | Polls | What's New | Raffle | Photo of the Month | Sponsors]

C900 Bulletin Board
1979-1993 & 94 Conv [Subscribe to Daily Digest]
(Search Author's Posts: e.g. Keyword:username)*Members Only


[Main C900 Bulletin Board | Post Followup | BBFAQ ] [ Prev by Date ] [ Next by Date ] Member Login / Signup [Latest Member Gallery Photos]
The infamous APC clicking
Like This Post:
Posted by SwedishDynamicsInc [Email] (#2304) [Profile/Gallery] (more from SwedishDynamicsInc) on Tue, 22 May 2018 13:48:57 Share Post by Email
In Reply to: the infamous APC clicking, ryan [Profile/Gallery] , Mon, 21 May 2018 10:29:49
Alert me when someone posts in this thread:

Ryan,

Thank you for posting at TSN!

Your clicking symptoms are typically at the SAAB 900 APC system's solenoid valve(BCV/Boost Control Valve), which should be mounted at the radiator support.

This solenoid will typically cycle, in the manner mentioned, when the APC control unit is not receiving proper input signals, or could be indicative of a tired APC component. Many of the 900 APC systems have been in service for over 30 years, making a common culprit of a cycling APC solenoid valve to be determined as weakened terminal connections at the APC control unit or components. Clean all terminal connections at the APC control unit wiring harness, and APC Knock Sensor, which will be mounted at the engine block casting and may be viewed through the B202 engine's intake manifold plenum center. A firm copper wire brush would allow for cleaning the terminals, and look for obvious oxidation which may require additional effort.

In some cases, faulty APC components, could cause similar solenoid activity, and the most common culprit would be a Pressure Transducer which may be found under the 900 interior knee shield. Also, check the engine compartment for vacuum line leaks which could lead to a reduction of engine vacuum and cause similar APC solenoid symptoms. In some rare cases, the APC control unit, could prove as being temperamental, and your symptoms will subside, if installing a known good replacement control unit. Any 1986 to 1993 900 Turbo model APC control unit will allow for direct installation for testing.

Good luck with your repair, and we will look forward to hearing relative to any progress!

Sincerely,

Gary K. at SWEDISH DYNAMICS, INC.

http://WWW.SAABPerformanceParts.Com

->Posting last edited on Tue, 22 May 2018 21:24:19.


Posts in this Thread:
Alert me when someone posts in this thread:

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 [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: [Member Only Feature] - Sign Up





The content on this site may not be republished without permission. Copyright © 1988-2020 - The Saab Network - saabnet.com.
For usage guidelines, see the Saabnet.com Mission and Purpose Page.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]

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
Your address is: 34.229.131.116 - Using CCBot/2.0 (https://commoncrawl.org/faq/) - Logged.


v.190714
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!