Re: 1993 900, non turbo, stalling- no start- long - sorry - Saab 900 Bulletin Board - Saabnet.com
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Re: 1993 900, non turbo, stalling- no start- long - sorry
Posted by Paul Willis [Email] (more from Paul Willis) on Thu, 10 Jan 2019 16:48:37
In Reply to: Re: 1993 900, non turbo, stalling- no start- long - sorry, t, Thu, 10 Jan 2019 14:22:39
I understand that the ECUs are very specific so I would not swap out one that does not match the version spec'd for your car. Esp the later 900s had the largely upgraded versions and a lot is different.
The fact that it starts when cold and then starts to have issues when warmed up seems like it is not spark related. If the cap and rotor are in good shape, and wires are good, then probably not that. I had a worn cap and it ran like poop in all temps. Could be that the fuel pump heats up after running for a while and then craps out, but hard to tell. But the ECU does get a signal about the operating temp of the engine from a sensor so that might be bad. The sensor on the top radiator hose is not that one, and the one that signals the gauge on the instrument cluster is not it either. It is on the side of the block or head-can't recall (check the manual) Just a thought.
It also could be the AMM that can't figure out what is going on. I think the ECU has a sort of default mode if it thinks or doesn't know the engine is cold. So, if the sensor is not working, or the AMM is failing, as the engine warms up the ECU will make bad decisions about fuel mixture and cause problems.
I would take out the Idle control valve, clean it good with WD40 as many recommend, and see if that helps. Also you can test it. If that doesn't work, I would clean the AMM carefully and and test it (per the manual). There is a burn-off test that also you can do. Also you can test the temp sensor. Good luck
posted by 99.198.22...
Posts in this Thread:
- 1993 900, non turbo, stalling- no start- long - sorry, t, Thu, 10 Jan 2019 06:36:51
- Re: 1993 900, non turbo, stalling- no start- long - sorry, colduck , Thu, 10 Jan 2019 17:24:17
- Re: 1993 900, non turbo, stalling- no start- long - sorry, Justin VanAbrahams , Thu, 10 Jan 2019 08:30:13
- Re: 1993 900, non turbo, stalling- no start- long - sorry, t, Thu, 10 Jan 2019 09:16:43
- Re: 1993 900, non turbo, stalling- no start- long - sorry, Roger D , Thu, 10 Jan 2019 10:00:04
- Re: 1993 900, non turbo, stalling- no start- long - sorry, t, Thu, 10 Jan 2019 14:22:39
- Re: 1993 900, non turbo, stalling- no start- long - sorry, Justin VanAbrahams , Thu, 10 Jan 2019 16:57:49
- Re: 1993 900, non turbo, stalling- no start- long - sorry, Paul Willis, Thu, 10 Jan 2019 16:48:37 <-- Viewing This Message
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