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On your non-turbo, the hall effect sensor is next to the crankshaft, under the main pulley.
Your problem sounds similar to the problem I had with my '89 900T.
How long does the car run if you jumper the fuel pump relay? If it just keeps running and running, then the ECU is bad.
You can use a n/a 900 ECU from '88 through '90 (avoid '89 of you can) or a 900T ECU from '89 through '93 (or '94 CV) (avoid '89 if you can). These are all LH 2.4 ECUs. Just open the new one up and swap the EPROM chip if your spare isn't from a '90 N/A model. If you get an ECU from a 900T and don't swap the chip, the car will run fine, but the fuel mapping will be a little funny.
One important thing is to replace the fuel pump relay and system relay with new ones *and* clean up the ground point on the lifting eye behind the AIC valve. The relays have a snubber (diode or MOV) that absorbs the backfeed from the coil that occurs when the ECU switches off the relay. The snubber deteriorates over time and the backfeed damages the solid-state relay in the ECU.
What year 900 did you get the spare ECU from?
PS. Good job getting the parts from the pick n pull.
posted by 66.21.16...
Posts in this Thread:
- 89 Saab 900, Carol in TX, Sun, 5 Jan 2003 23:56:34
- Re: 89 Saab 900, EdWes, Tue, 7 Jan 2003 08:17:17
- Bad ECU, RS
, Mon, 6 Jan 2003 08:28:12 <-- Viewing This Message- Re: Bad ECU, Carol in TX, Mon, 6 Jan 2003 09:56:26
- '89 was a bad year for C900 ECUs, RS
, Mon, 6 Jan 2003 12:49:43 - Re: Bad ECU, JimBlake
, Mon, 6 Jan 2003 12:05:39- Thanks for all the good info but..., Carol in Texas, Mon, 6 Jan 2003 12:54:43
- Re: Thanks for all the good info but..., JimBlake
, Mon, 6 Jan 2003 13:59:49 - Let's go back to the beginning ..., RS
, Mon, 6 Jan 2003 13:06:15- Re: Let's go back to the beginning ..., Carol in TX, Mon, 6 Jan 2003 14:14:46
- OK. Maybe ignition module, RS
, Mon, 6 Jan 2003 15:26:56- non-turbo??, JimBlake
, Mon, 6 Jan 2003 15:44:25 - PS, RS
, Mon, 6 Jan 2003 15:29:53- Re: PS, Carol in TX, Tue, 7 Jan 2003 00:35:02
- Re: PS, Carol in TX, Mon, 6 Jan 2003 20:52:56
- Re: PS, Carol in TX, Mon, 6 Jan 2003 16:20:03
- Where in TX? n/m, Dave D, Mon, 6 Jan 2003 01:05:46
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