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3-2-1 Code 700 1990

posted by lucid on Fri Oct 12 00:36 CST 2007
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last visit: Fri Oct 24 12:31 CST 2014

[RELATED]

Has Service Bulletin #135 (Jan 1990) been applied?
It says it's for, "cold start difficulties...caused by a rich fuel mixture during engine crank and cold start warm-up functions."

Apparently the CS injector + side was originally wired from the radio Suppression Relay, and controlled on the ground side by a temp-sensitive ground in the ECU. So it must have squirted continuously until the temp sensor opened the ground side, which lead to an over-rich mixture right after starting.

The Service Bulletin brings the + voltage to the CS injector as in the older cars—from a starter terminal that provides voltage only when cranking.

Pull back the boot on the CS injector and check to see if the original Blue/Green + wire has been removed, folded back, and replaced by wire (unspecified color) leading to starter solenoid terminal 15a or 16.

A side-effect of this change is that OBD code 3-2-1 is permanently stored in the self-diagnostic memory (but will no longer set the Check Engine Light). That would also be a quick way to see if the SB #135 change has been applied.
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.

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Fouled plugs/no start/regina engine [700][1990]
posted by Blindboy subscriber on Thu Oct 11 10:19 CST 2007 >

Fouled plugs/no start/regina engine [700][1990]
posted by Brant_740t on Thu Oct 11 10:59 CST 2007 > V
- Fouled plugs/no start/regina engine [700][1990]
  posted by Texas745 on Thu Oct 11 11:13 CST 2007 > V
  - Fouled plugs/no start/regina engine [700][1990]
    posted by Blindboy subscriber on Thu Oct 11 11:18 CST 2007 > V
    - Fouled plugs/no start/regina engine [700][1990]
      posted by tripleb on Thu Oct 11 13:54 CST 2007 > V
      - Fouled plugs/no start/regina engine [700][1990]
        posted by Blindboy subscriber on Thu Oct 11 16:31 CST 2007 > V
        
        3-2-1 Code [700][1990]
        posted by lucid subscriber on Fri Oct 12 00:36 CST 2007 > V
        
        3-2-1 Code [700][1990]
        posted by Blindboy subscriber on Fri Oct 12 13:02 CST 2007 > V
        
        SUCCESSSSSSS!!!!!!!!!! [700][1990]
        posted by Blindboy subscriber on Sun Oct 14 13:43 CST 2007 > V
        
        SUCCESSSSSSS!!!!!!!!!! [700][1990]
        posted by Blindboy subscriber on Tue Oct 16 13:15 CST 2007 > V
        
        3-2-1 Code [700][1990]
        posted by Blindboy subscriber on Sat Oct 13 13:25 CST 2007 > V
- Fouled plugs/no start/regina engine [700][1990]
  posted by Blindboy subscriber on Thu Oct 11 11:15 CST 2007 > V

Fouled plugs/no start/regina engine [700][1990]
posted by Texas745 on Thu Oct 11 11:20 CST 2007 > V

Fouled plugs/no start/regina engine [700][1990]
posted by B.B. subscriber on Thu Oct 11 11:29 CST 2007 > V

Fouled plugs/no start/regina engine [700][1990]
posted by someone claiming to be fixit2003 on Fri Oct 12 02:24 CST 2007 > V
- Fouled plugs/no start/regina engine [700][1990]
  posted by Blindboy subscriber on Fri Oct 12 02:48 CST 2007 > V

Fouled plugs/no start/regina engine [700][1990]
posted by Chris Mullet subscriber on Fri Oct 12 02:38 CST 2007 > V

Fouled plugs/no start/regina engine [700][1990]
posted by Ryan_R subscriber on Fri Oct 12 08:42 CST 2007 > V
- Nice Link - Thanks! (nmi) [700][1990]
  posted by Chris Mullet subscriber on Fri Oct 12 09:31 CST 2007 > V
  - Nice Link - Thanks! (nmi) [700][1990]
    posted by Ryan_R subscriber on Fri Oct 12 10:27 CST 2007 > V
- Fouled plugs/no start/regina engine [700][1990]
  posted by Blindboy subscriber on Tue Oct 16 13:13 CST 2007 > V
  - Fouled plugs/no start/regina engine [700][1990]
    posted by Ryan_R subscriber on Tue Oct 16 13:32 CST 2007 > V
    - Fouled plugs/no start/regina engine [700][1990]
      posted by Blindboy subscriber on Wed Oct 17 10:32 CST 2007 > V

Fouled plugs/no start/regina engine [700][1990]
posted by lucid subscriber on Wed Oct 17 02:35 CST 2007 > V
- Fouled plugs/no start/regina engine [700][1990]
  posted by Blindboy subscriber on Wed Oct 17 02:58 CST 2007 > V
  - Fouled plugs/no start/regina engine [700][1990]
    posted by lucid subscriber on Wed Oct 17 03:18 CST 2007 > V
    - Fouled plugs/no start/regina engine [700][1990]
      posted by Blindboy subscriber on Wed Oct 17 05:56 CST 2007 > V
    - Fouled plugs/no start/regina engine [700][1990]
      posted by Blindboy subscriber on Wed Oct 17 10:11 CST 2007 > V
      - Fouled plugs/no start/regina engine [700][1990]
        posted by lucid subscriber on Wed Oct 17 10:48 CST 2007 > V
        
        Fouled plugs/no start/regina engine [700][1990]
        posted by Ryan_R subscriber on Wed Oct 17 12:32 CST 2007 > V
        
        NTK - Walker - Denso conjecture [700][1990]
        posted by lucid subscriber on Wed Oct 17 12:48 CST 2007 > V
  - Fouled plugs/no start/regina engine [700][1990]
    posted by Ryan_R subscriber on Wed Oct 17 12:27 CST 2007 > V

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3-2-1 Code 700 1990