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]
[Main Saab Model 99 Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
CIS stuff
Posted by Rowan (more from Rowan) on Thu, 28 Apr 2005 22:17:57
In Reply to: Full MSS header and exhaust experiences? >>>>, BobD, Thu, 28 Apr 2005 09:17:35
Members do not see ads below this line. - Help Keep This Site Online - Signup
Hi Bob,
You may already know all of the following, but here are some things to look at with CIS:
The mixture is tuned using a modulation valve which should be mounted near the driver's side of the radiator, with two wires and fuel lines to and from - if memory serves, in the absence of a signal from the ECU, it operates at a set frequency. If this valve is shot, or if the signal isn't getting to it form the ECU, mixture may be off. The valve should make an audible buzzing noise when the engine is running.
If the oxygen sensor is kaput, you will have a difficult time getting the mixture right - on my previous 99, the O2 sensor went bad, and it eventually fouled the plugs. You said you own 900s as well, right? SO similar setup, but without the preheater circuit.
Have you already pulled the injectors and made sure they're all spraying properly and consistently?
And last, you might want to make sure that the throttle switch and the vacuum switch which trigger the cold start injector aren't somehow stuck closed - 'cause thar could certainly do something to your mixture as well.
When I got my previous car, the exhaust had broken loose and fallen on the CIS wiring harness, and the heat had melted stuff all the way back to the fusebox - so the owner had disconnected the whole system and set the mix so the car would run, and had been running it that way for a couple of years. Lots of backfiring when accelerating. I got all new harness and wired it up and it made a world of difference.
Oh yeah, one other thing - at least on my '78 turbo, there was a system relay for the CIS setup which was under the fusebox, not on top. It's shown in the wiring schematics in the Haynes, but the don't tell you where it is.
Hope this helps some.
Rowan
posted by 66.170....
Posts in this Thread:
- Full MSS header and exhaust experiences? >>>>, BobD, Thu, 28 Apr 2005 09:17:35
- Re: Full MSS header and exhaust experiences? >>>>, super99, Wed, 15 Jun 2005 15:50:26
- Re: Full MSS header and exhaust experiences? >>>>, Kevin, Fri, 29 Apr 2005 03:46:26
- CIS stuff, Rowan, Thu, 28 Apr 2005 22:17:57 <-- Viewing This Message
- Re: Full MSS header and exhaust experiences? >>>>, JesseP, Thu, 28 Apr 2005 11:59:54
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.
StateOfNine.com
![](/tsn/xyz/stateofninebutton.gif) |
SaabClub.com
![](/tsn/xyz/scnabutton.gif) |
Jak Stoll Performance
![](/tsn/xyz/jakstollbutton.gif) |
M Car Covers
![](/tsn/xyz/mcarcoversbutton.gif) |
Ad Available
![](/tsn/xyz/buttonavailable.gif) |
![](/tsn/images/tsnmap.gif)
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!