Re: Cold Start Stalling--Clarification - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
The banner above is an advertisment - if it asks you to download software, please ignore.
Site News -
[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 NG900 & OG93 Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Re: Cold Start Stalling--Clarification
Posted by NHWayne [Email] (more from NHWayne) on Wed, 25 Feb 2009 16:20:28
In Reply to: Re: Cold Start Stalling--Clarification, Jamie, Tue, 24 Feb 2009 20:49:58
Members do not see ads below this line. - Help Keep This Site Online - Signup
If your temp sensor NEVER leaves cold, you likely have a thermo that is stuck open, or a faulty sensor. Do you get heat?
If you get normal heat, and your temp gauge never leaves cold, it is more likely the sensor. This can cause a such a problem because the ecu is thinking that the engine is colder than it actually is and opening the valve more and enriching the mixture more than it should be. Try measuring the resistance and comparing it too the coolant temp.
A faulty thermo by itself that is stuck open SHOULDN'T affect the idle in that way just because it is reading the correct temp of the engine and informing the ecu accordingly.
What's happening after a couple of minutes can possibly be attributed by the fact that your cold start circuit is operating accordingly. That is an "open loop" phase where the ecu is making certain assumptions based on engine temp, airflow, and rpm. After a couple of minutes to let the O2 sensors heat up (they need to reach a certain temp in order to read correctly - that's why the open loop sequence), the engine then goes into "closed loop" operation where it starts using information from the O2, etc. to determine engine running parameters.
You cleaned your idle valve, but have you checked it electrically, or even tried swapping it out for a known good one?
posted by 98.229.227...
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
|
SaabClub.com
|
Jak Stoll Performance
|
M Car Covers
|
Ad Available
|
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!