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Adjusting The Idle Screw On The Aac (rb20det)

lows_13

By lows_13,
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insu Rising Star

insu

Posted
Posted (edited)

Hey guys.

Hey RB30-POWER, where did you get the instructions for the resetting of the idle on the RB25DET? I only ask cause it was my DIY posted up on here to invloving my idle reset from when i cleaned my AAC valve.

I can't remember 100%, but i'm pretty sure I got my method from the nissan engine service manual.

I might have got it around the wrong way like you've posted and its the TPS sensor that needs to be removed while adjusting the idle through the idle adjustment screw, and not the AAC valve as is the method for the RB20det.

Either way, it seems to work i spose, as it is the AAC assembly that allows more air in for idle if it thinks the car needs it, and by disconnecting this plug while adjusting the base setting then re-attaching the connection and looking for any differences in idle speed before fine tuning if need be (though i still haven't heard of any skylines requiring this step).

The best reason I can think of for disconnecting the TPS from the RB25 while adjusting the idle screw, is so that the value coming from the TPS is absolutely nothing, so even if the car thinks it has to compensate for a TPS setting or that the Throttle is even partly open, it won't affect the setting of the idle.

Or I may be completely wrong.

Edited by insu

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