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plugs say lean, ECU says rich 700 1986

posted by joel142 on Sun Sep 29 16:50 CST 2002
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I've got a strange problem with my newly purchased '86 744T (LH 2.2) in that the plugs are bleached white (indicating, in my mind, a lean condition) while the ECU firmly maintains (via the dwell/CO testpoint) that the mixture is too rich.

When I got it, the car was in pretty rough shape and I've since replaced all the vacuum hoses, checked the induction system (full disassembly) and gave it a fairly thorough tune-up. I've also replaced the FPR (strong fuel smell in the control line), O2 sensor (stuck at 0.95V) and the fuel filter.

One problem I inherited with the car was an idle around 2500 rpm. I popped the ECU open and discovered one of the controlling transistors was shorted so I swapped in an equivalent part. Now the idle is rock solid at 750/800rpm. Have EE degree, will travel.

Am I looking at a new ECU? I assumed that its failure would be indicated by the car ceasing to function at all.

Thanks

Joel

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plugs say lean, ECU says rich [700][1986]
posted by joel142 on Sun Sep 29 16:50 CST 2002 >

plugs say lean, ECU says rich [700][1986]
posted by someone claiming to be nate on Mon Sep 30 07:05 CST 2002 > V
- plugs say lean, ECU says rich [700][1986]
  posted by joel142 on Mon Sep 30 09:58 CST 2002 > V

plugs say lean, ECU says rich [700][1986]
posted by VolvoSteel subscriber on Mon Sep 30 08:30 CST 2002 > V
- plugs say lean, ECU says rich [700][1986]
  posted by joel142 on Mon Sep 30 10:23 CST 2002 > V

plugs say lean, ECU says rich [700][1986]
posted by john sargent subscriber on Mon Sep 30 11:21 CST 2002 > V
- plugs say lean, ECU says rich [700][1986]
  posted by joel142 on Mon Sep 30 11:36 CST 2002 > V
  - plugs say lean, ECU says rich [700][1986]
    posted by john sargent subscriber on Mon Sep 30 11:52 CST 2002 > V
    - plugs say lean, ECU says rich [700][1986]
      posted by joel142 on Mon Sep 30 12:07 CST 2002 > V
      - plugs say lean, ECU says rich [700][1986]
        posted by john sargent subscriber on Mon Sep 30 12:20 CST 2002 > V
        
        plugs say lean, ECU says rich [700][1986]
        posted by joel142 on Mon Sep 30 13:35 CST 2002 > V
        
        results from AMM adjustment (plugs say lean, ECU says rich) [700][1986]
        posted by joel142 on Tue Oct 1 04:49 CST 2002 > V
        
        results from AMM adjustment (plugs say lean, ECU says rich) [700][1986]
        posted by mcduck subscriber on Tue Oct 1 07:19 CST 2002 > V
        
        results from AMM adjustment (plugs say lean, ECU says rich) [700][1986]
        posted by joel142 on Tue Oct 1 07:50 CST 2002 > V
        
        results from AMM adjustment (plugs say lean, ECU says rich) [700][1986]
        posted by david hunter on Tue Oct 1 11:38 CST 2002 > V
        
        results from AMM adjustment (plugs say lean, ECU says rich) [700][1986]
        posted by joel142 on Tue Oct 1 12:38 CST 2002 > V
        
        results from AMM adjustment (plugs say lean, ECU says rich) [700][1986]
        posted by david hunter on Wed Oct 2 16:58 CST 2002 > V
        
        results from AMM adjustment (plugs say lean, ECU says rich) [700][1986]
        posted by john sargent subscriber on Tue Oct 1 11:44 CST 2002 > V
        
        results from AMM adjustment (plugs say lean, ECU says rich) [700][1986]
        posted by joel142 on Tue Oct 1 12:23 CST 2002 > V
        
        results from AMM adjustment (plugs say lean, ECU says rich) [700][1986]
        posted by mcduck subscriber on Tue Oct 1 12:52 CST 2002 > V
        
        results from AMM adjustment (plugs say lean, ECU says rich) [700][1986]
        posted by john sargent subscriber on Tue Oct 1 11:47 CST 2002 > V

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plugs say lean, ECU says rich 700 1986