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hipdoc's Avatar
 
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930 start

Why does my 79' 930 rev high when I first start it cold? It will rev to 2800-3000 for about 30 sec then it will oscillate 5-7 times between 700-1600 before it comes to idle. It'll idle smooth at 900 and runs great afterwards. Any ideas?. My neighbors are probably getting pissed when I start my car in the morning.

Old 06-26-2012, 06:49 AM
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Sounds like AAR is open to far when it's cold
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Old 06-26-2012, 12:19 PM
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Aar?
Old 06-26-2012, 03:42 PM
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Also know as AAV:

AAV - anyone run without?
Old 06-26-2012, 03:55 PM
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Old 06-26-2012, 06:15 PM
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Auxillary air regulator, auxillary air valve. Allows a small amount of air to bypass the throttle body and enter the intake manifold, causing high idle. It's a temperature sensitive valve/regulator that is open further when cold and closes when hot, thus regulating the amount of air bypassing the TB dependent upon the temperature.
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Old 06-26-2012, 08:20 PM
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And it is adjustable
Old 06-26-2012, 08:34 PM
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oscillation is caused by "rich" condition.

mine oscillates at anything below 12.2 AFR...
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Old 06-27-2012, 06:31 AM
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any one know how hot for it to close?

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Old 06-27-2012, 07:16 PM
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