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Ok, I have been dealing with this for a long time. the 89 base ECU died like all eventually do. I got a '90 NA ECU and put it in. I get an intermitent CE light and a *wierd* idle. It will oscillate up and down. up to 1200 then down to 800 and back. It is like it is in resonance. I tried a new AMM. Every AMM works just fine in my '92 turbo and in the '89 with the 90 ECU it has an oscillating idle. Fuel mileage is fine, it starts right up every time. I put the 89 ECU back in it and cut the purple lead to the FP relay and grounded it such that the fuel pump runs with the key on and will run afterwards for 30 seconds or something. It idles absolutely beautifully. Based on this swap, it would seem to be a bad '90 ECU (too, but different). It is actually a friend's car now and I end up dealing with this! Any ideas? Does anyone here have a '90 NA ECU in an '89? I think Roo tried this and lost his A/C compressor, but I think it is the relay. I cannot verify from here, though. Any odeas here? Does anyone have an '89 or '90 NA car that would be willing to try this ECU to see if it does the same thing? I'd cover shipping. A little board level investigation reveals a couple of differences.
'89: '90:
Bosch 0 280 000 564 0 280 000 580
Saab 74 87 135 91 19 447
Board number: 2288311454-6 2288329417-2
no chip at BS704 B57528 chip at BS704
jumper at B700 no jumper at B700
jumper at D800 no jumper at D800
no D701 diode at D701

posted by 64.105.106...

• 89 NA ECU, KeithG, Tue, 22 Oct 2002 23:00:19 <-- Viewing This Message
  • Something else to try ..., RS , Wed, 23 Oct 2002 09:39:55
    • Been there, tried that..., KeithG, Wed, 23 Oct 2002 10:04:08
      • Cleaned the AIC valve?, RS , Wed, 23 Oct 2002 10:26:32
        • Yup!, KeithG, Wed, 23 Oct 2002 10:40:13
          • Re: Yup!, RS , Wed, 23 Oct 2002 10:52:01
            • I think you misunderstand..., KeithG, Wed, 23 Oct 2002 11:40:49
              • No, I understand perfectly ...., RS , Wed, 23 Oct 2002 13:18:35
                • Yo, thanks!, KeithG, Wed, 23 Oct 2002 15:30:21
                  • Glad to help - good luck with it ..., RS , Wed, 23 Oct 2002 15:44:52
            • Still problems!, KeithG, Wed, 23 Oct 2002 11:32:18
              • when you're cleaning grounds..., JimBlake , Wed, 23 Oct 2002 11:46:59
            • Re: Yup!, Ubipa, Wed, 23 Oct 2002 10:57:27
  • Re: 89 NA ECU, RS , Wed, 23 Oct 2002 08:15:53
    • Re: 89 NA ECU, JimBlake , Wed, 23 Oct 2002 11:43:01
      • What does Pin 14 do? DI or DO? TIA n/m, RS , Wed, 23 Oct 2002 20:01:22
        • Pin 14, JimBlake , Thu, 24 Oct 2002 07:53:33
          • Thanks Jim n/m, RS , Thu, 24 Oct 2002 08:30:57
      • Yes, you're absolutely right. n/m, RS , Wed, 23 Oct 2002 19:53:20
    • Ever get around to swapping the 89 chip into the 90?, Ubipa, Wed, 23 Oct 2002 10:48:11
      • Re: Ever get around to swapping the 89 chip into the 90?, RS , Wed, 23 Oct 2002 10:57:24
    • Yes, everything else very good, KeithG, Wed, 23 Oct 2002 08:58:56
      • I think that they are., RS , Wed, 23 Oct 2002 09:25:43
    • ECU history, Mr. Science, Wed, 23 Oct 2002 08:37:23
      • Re: ECU history, RS , Wed, 23 Oct 2002 08:54:00

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