strange hunting idle problem - Saab 900 Bulletin Board - Saabnet.com
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strange hunting idle problem
Posted by Sjer (more from Sjer) on Sun, 27 Jun 2004 09:26:22
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This started at the same time that the fuel pump would not run (see earlier post- dying fuel pump, surging idle). The idle cycles quickly between 1000 and 1500 rpm. I replaced the fuel pump, even though I did not think the idle problem was FP related.
Next I checked the AIC valve. When I disconnected the AIC valve, the idle hunting stopped and it idled smoothly at about 800 rpm. So you would think bad AIC valve, right? I swapped the AIC valve with a known good one from a 9000, and still had the idle hunting problem when the AIC valve plug is connected (to the "known good" AIC valve). Anyone know what's going on? It has to be related to a signal that is used to control the AIC valve, but I don't know where to look.
In the mean time, obviously, I have disconnected the AIC valve and everything runs perfectly.
posted by 64.24.186...
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