Have you verified fuel mix adjustment ? >>>> - Saab 900 Bulletin Board - Saabnet.com
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Have you verified fuel mix adjustment ? >>>>
Posted by BobD (more from BobD) on Tue, 13 Sep 2005 09:13:50
In Reply to: Need Help with my Son’s 84 900 Project – Hesitation and, Brian Kelly, Tue, 13 Sep 2005 08:04:07
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Not sure if this might relate to your problem, but the buzzing frequency valve is the mixture adjust relative to signals from the ECU in response to Oxy sensor input. Faster buzz means it is trying to adjust to richer mixture. Maybe just too lean after cold start - richer mix backs off? The thermo mixture valve [ forget proper name ] adjacent to the thermostat housing can go haywire and give improper mixture. Simple voltage readings from the oxy sensor might give some indications. If it is stumbly at idle when this happens [ close contact by pushing it with finger ]you can try the enrichment at full throttle switch at the throttle butterfly and see if it increases the 'buzz' at the valve and smooths out with enriched mix.
Do you have a manual with the CIS injection test sequences ?
posted by 67.170.168...
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