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Honestly if you don't have any starting problems or slow cranking problems it's hard to jump to a low battery charge. The problem will lie in your auxillary air control valve, which is located on the passengers side of the intake plenum (collector). When the ecu is told of some sort of load (electrical or mechanical) then it increases the voltage to the AACV motor which allows more air into the plenum, which increases idle. You can test your AACV motor and see if it reads 12 ohms, if not it needs to be replaced. If the motor is fine, then remove the assembly and clean it thoroughly. Clean your throttle body also, there is a smal hole in the throttle body that will greatly affect your idle.
Sudesh
TeamNSE.Com - Nissan Stanza Enthusiasts
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