The above is an advertisment. If it asks you to download software or create an account, please ignore it.
Site News - 11/25: Special Ad Rate | 11/1: Members: Log In to See Fewer Ads!
[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]

93 Bulletin Board
2003-2011 [Subscribe to Daily Digest]
(Search Author's Posts: e.g. Keyword:username)*Members Only

[Main 93 Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Low RPM throttle issue
Like This Post: - Subscribe to Daily Digest for this Bulletin Board
Posted by Philip Tone (more from Philip Tone) on Mon, 22 Sep 2025 17:13:09 Share Post by Email
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup

I'm sure this has been dealt with on many forums before, but...

Going up a hill at low speed in my 2006 9-3 4-cyl turbo, I had almost no throttle. CEL came on, but at higher revs I was able to get home in a 20mph zone near the house. Got in later, started car, still had CEL. Had it towed to my mechanic (German car specialist, but owner is a Saab freak). They couldn't find the issue. Although they did get two stored error codes:

T8 ECM: P0638-00 throttle mechanical, throttle position deviation from demanded
P1682-00 plausibility fault between voltage feed from+15 and main relay

that's verbatim what they wrote. they cleared the fault memory, restarted the car, and said it ran normally.

they only said that the throttle control unit may be failing.

So the car was running fine for two months and now today it occurred today. Both times it occurred shortly after returning to the car and setting out after having driven it an hour earlier.


I am not a mechanic, so I was just looking online at possible culprits. There was: PCV check valve,
defective ignition coil, throttle position sensor, vacuum leak, fuel filter, etc. Along the way, folks were recommending resetting the ECU. How would that help?

I am not confident that my mechanic will do any better if I take it back to him. Since I have now read that a number of things could be going on, I'd like some advice on my next step. Will a new throttle body fix things? Do I need another mechanic to look at this first? Any thoughts?

Thanks, Phil

posted by 73.157.181...
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 © 1988-2025 - 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!