Wierd boost oscillations(long, sort of) - Saab 9000 Bulletin Board - Saabnet.com
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 9000 Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Wierd boost oscillations(long, sort of)
Posted by jj (more from jj) on Sat, 18 Sep 2004 09:41:57
Members do not see ads below this line. - Help Keep This Site Online - Signup
My '95 CS FPT has this strange boost oscillation.
When I do an adaptation run from 2500 to 4000 RPM in 3rd, 4th or
5th, the boost behaves like this:
Initially it produces 15 psi at 2500.
It will hold 15 for a second and then the boost drops to 12 and then increases rapidly to 14, then back to 12, then back to 14,
By this time, the motor is at 3500-3800 rpm. The boost then falls to
11 psi and holds steady untill 5000 rpm.
This behavior is very repeatable. (I do adaptation runs whenever traffic allows :) )
It has new plugs, all silicon vac hoses, BPC valve OK (swapped with
good one), Viggen "dump-valve", modified air-box with K&N in fender.
The ECU is from a '95 auto-Aero.
Any ideas on what to check?
Thanks,
jj
'95 CS FPT
'95 auto-Aero
'97 CSE Anniversary Ed.
posted by 68.160.1...
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.
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!