Welcome to the world of Saab ! Register
Results 1 to 4 of 4
  1. #1

    Join Date
    06 Feb 2021
    Location
    Ontario
    Posts
    2
    Saab(s)
    1990 900s
    Thumbs Up:   0

    Engine issues

    Good day,

    I am new to the forum, but hoping for some assistance.

    I bought a 1990 900s a few years back. It was in great condition, but did not run. I tried about every thing I could find by searching the forums and to no avail. For the next three years I would occasionally try working on it again and never actually got it running. Meanwhile it has been sitting in my garage and still looks good as ever.

    A couple weeks ago, with the help of a friend, I finally got it to somewhat run. We accomplished this by wiring the #15 on the coil directly to the battery. That will make it start and actually run quite nice. Until it warms up a bit (I think).
    Then it will just shut off. I can then start it again. It will run again although not as long as the first time, and then shut off again. Repeat this until it wont start at all.

    Let it sit for a few hours... and it starts right back up again.

    Looks like it is running rich as plugs are wet and black.

    Couple things I have done/confirmed:
    Spark seems good even without wiring 12v to coil.
    Have switched out CPS, EZK, CPU and ignition amp (EZK and CPU didn't make a difference, so I have the originals back in).
    Changed out plugs.
    Have checked for fuel pressure.
    Probably missing some stuff here as I have been trying to fix it for a while.


    Any help would be appreciated.

    0 Not allowed!

  2. #2
    Saab Addict
    Join Date
    10 Apr 2017
    Location
    Denham, England
    Posts
    505
    Saab(s)
    2011 2.0 9-5 Aero
    Thumbs Up:   68
    If wiring the coil directly gets the engine to start but it stops again after a period I would try replacing the coil.
    you really aren't going to get to the bottom of the problem without wiring diagrams, you may need to look on eBay for those.

    0 Not allowed!

  3. #3

    Join Date
    06 Feb 2021
    Location
    Ontario
    Posts
    2
    Saab(s)
    1990 900s
    Thumbs Up:   0
    Thanks for the reply,

    One of the things I failed to mention is that I have swapped out the coil and the distributor cap, rotor and leads.

    I actually have original Saab 900 service manuals at my disposal. Have looked thru the drawings a bit but no luck so far.

    0 Not allowed!

  4. #4
    Saab Addict
    Join Date
    10 Apr 2017
    Location
    Denham, England
    Posts
    505
    Saab(s)
    2011 2.0 9-5 Aero
    Thumbs Up:   68
    OK, I don't remember the ignition circuit but you need to start at the beginning by checking that each position of the ignition switch powers the expected circuits. I am sorry but without the wiring diagrams I cannot offer specific ideas.

    OK I have the diagrams, easier than I thought to find them. Have you changed the ignition amplifier? It is a small box that connects between the coil and earth point. It doesn't like getting hot, when it does it cuts out, and the engine stops

    .Name:  Saab900 ign amp.jpg
Views: 32
Size:  50.3 KB

    It is located as shown below, just below and forward of the EZK
    Name:  Saab 900 ign sys.jpg
Views: 32
Size:  56.5 KB

    0 Not allowed!

 

 

Similar Threads

  1. Replies: 0
    Last Post: 04 December 2017, 05:49
  2. Replies: 18
    Last Post: 18 January 2016, 07:36
  3. Can a 93 B204E engine be used to replace a dead 93 B205E engine ?
    By Paul Leissner in forum Saab 900 and 9-3 (1994-2003)
    Replies: 2
    Last Post: 18 July 2015, 10:41
  4. Engine drivability issues - erratic gas-pedal response
    By SatchSportSedan in forum Saab 9-3 (2003-2014)
    Replies: 4
    Last Post: 27 October 2012, 11:12
  5. Engine Oil Leak-My Engine Leaks oil- New to Boards
    By Saab Let in forum Saab 9-3 (2003-2014)
    Replies: 1
    Last Post: 27 January 2012, 03:58

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
All times are GMT. The time now is 23:39.
Powered by vBulletin® Version 4.2.5
Copyright © 2021 vBulletin Solutions Inc. All rights reserved.