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Aac Valve

beastien

By beastien,
in Four Door Family & Wagoneers

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AlexCim Grand Master

AlexCim

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This is for an SR20DE but...

Auxiliary Air Control (AAC) valve. This is the ECU's main idle control mechanism. It's a solenoid valve that opens or blocks airflow around the throttle plate. It's located on the Idle Air Adjusting (IAA) unit (along with the idle adjust screw and the FICD valve) on the passenger side of the engine block just behind the oil filter. The AAC valve points back toward the firewall and its wiring harness points toward the passenger-side wheelwell. The AAC valve operates a metal plunger on a metal valve seat, both of which could conceivably get dirty and fail to seal properly (or perhaps they need some sludge to seal at all. No data on this). The AAC valve itself seems robust, although it seems to get replaced quite often by dealers with undiagnosable idle/hesitation problems. I'd guess that replacing the valve is rarely necessary.

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beastien Proficient

beastien

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You hit it on the head AlexCim, My idle control was playin up a bit when i got the car, so i pulled the spool out of the valve and cleaned it up, and i havent been able to set it right until i purchased a consult adaptor just recently from NewKleer.

I think i've got it right but i just wanted to check what sort of readings other people where getting with the consult adaptor to compare.

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