Site News - 7/11: No New News Today | 5/10: 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]

Saab Model 99 Bulletin Board
1969-1984 [Subscribe to Daily Digest]
(Search Author's Posts: e.g. Keyword:username)*Members Only

[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
Re: Hot won't start issue
Like This Post: - Subscribe to Daily Digest for this Bulletin Board
Posted by Gary Stottler [Email] (#1463) [Profile/Gallery] (more from Gary Stottler) on Mon, 20 May 2013 15:11:01 Share Post by Email
In Reply to: Hot won't start issue, Stephen, Sat, 18 May 2013 21:03:58
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup

Agree with Jimmy, usually in CIS cars (Mechanical Fuel Injection - 1975-1980)this problem is caused by the fuel system losing "resting" pressure when the engine is shut off. As mentioned, when the system loses pressure then the 4 injector lines are full of vapor instead of liquid fuel and it can take 30-60 seconds of cranking to refill the lines in extreme cases. It was pretty bad in 1975-1977 cars and there was a service kit that basically started pulsing the cold start injector if you cranked more than 5 seconds or so with a hot engine. The injectors are a common leak path (although if it won't start at all, I would look at the other items I'm going to mention - usually leaky injectors will cause it to start on 2 or 3 cylinders because only one or two injectors are leaking. But, it is possible that all 4 are leaking).
There is a check valve in the fuel pump that can start leaking and cause the resting pressure to bleed down. In '78 and later pumps, the check valve was replaceable, but I don't know if the valve is available any more short of buying a new pump. There is also a leak path through the Warm Up Regulator/Control Pressure regulator in '75-'77 cars. '78 and later cars have a check valve in the fuel distributor to prevent that leak. Also, '78 and later cars got a larger accumulator (on the side of the fuel tank) so they can tolerate a bit more leakage without losing pressure. The best bet is to get a set of fuel pressure gauges on it and see if you can isolate where the pressure is bleeding off.
You could hook up the cold start injector to a push button and give it a manual shot of fuel when cranking also.
Good luck!
Gary

posted by 198.208.15... 
_______________________________________
Gary Stottler
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!