Rb25Det Idle Issues With A/c On Only

[theponyremark]

Hi all,

I am getting idle issues whereby the idle and voltage meter of the car sputters/goes between 500rpm to 800rpm when I turn the A/C on. Be it on low or high setting. Turning the heater on the low or high setting doesn't do this. The car idles fine otherwise. I noticed sometimes if I'm at the traffic lights, it may go below 800rpm at idle for a brief few seconds and go back to normal, but only if I press the brake pedal a little too hard. I've recently put in new NGK IX spark plugs and checked all the coil packs.

Could this be an ACC problem or do I need to get the A/C re-gassed? The A/C works fine other than causing the idling issue.

[mad082]

will most likely be the AAC valve. the AAC valve (auxillary air control) adjusts when things like the aircon is turned on, or the steering turned, as there is a higher load placed on the engine so the ecu compensates.

look in the DIY section on how to clean the AAC and see if that helps your issue.

[theponyremark]

Thanks for that Hugh, I had a look at the tutorial but I might grab a friend to help out in case I stuff it up.

[jiffo]

From memory................25 has 2-idle controls, AAC and the aircon.

AAC is brown plug, aircon is purple plug.

Easy to test, just pull the plugs one at a time to see what does what.

[theponyremark]

Thanks jiffo, I'll give that a test and see what that does before dismantling the IAC valve.