Re: Bizarre behavior, bad miss in certain gears, reverse AWOL - Saab 9000 Bulletin Board - Saabnet.com
The banner above is an advertisment - if it asks you to download software, please ignore.
Site News - 4/9 Saab Owners' Convention Day Pass Raffle | 3/26 M Car Covers (by State of Nine)

[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: Bizarre behavior, bad miss in certain gears, reverse AWOL
1 Saabers Like This Post!
Like This Post: - Subscribe to Daily Digest for this Bulletin Board
Posted by JerseySaab [Email] (#666) [Profile/Gallery] (more from JerseySaab) on Sat, 23 Jul 2022 17:34:31 Share Post by Email
In Reply to: Re: Bizarre behavior, bad miss in certain gears, reverse AWOL, un4gvn1 [Profile/Gallery] , Sat, 23 Jul 2022 14:04:43
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup

The transmission is a ZF 4HP18 and has no electronics, it is old-school 100% mechanical and hydraulic control. One of the problems we have is that this transmission is at this point nearly unknown in the United States. It was only ever used in a handful of low-volume models in the 1980s and 1990s and almost no one knows how to work on them.

The valve body is extremely complex with a crazy number of valves and springs. (Looks almost like something that came out of a space ship!) Saab used to recommend Lubegard Red additive to prevent control valves from sticking. Broken or weak springs can also affect shifting.

There is a vacuum hose on the trans but I don't know what its function is. Shift quality is controlled mainly by the cable attached to the throttle and that's a critical adjustment.

The transmission in my '97 CSE failed suddenly back in 2016 with over 300,000 miles on it. The symptoms were loss of drive shifting out of 1st gear and no reverse. I swapped out the valve body with a spare but it didn't help. Talking with Eriksson Industries, well-known for Saab transmissions, the problem appeared to be due to a broken band. I wound up buying a junkyard transmission and installing it myself - I lucked out and it still is working well.

Although they have since stopped supporting pre-GM Saabs it might be worth contacting Eriksson to see if any of their tech people have suggestions on what the problem with yours may be.


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!