Does't Idle smooth with aircon on

[rev210]

Anyone know what could be causing my car to not idle smooth (even stall sometimes) when the aircon is switched on?

It's not:

The plugs.

The timing.

The airflow meter.

[predator]

Well aircon saps a bit of power from the engine... your idle is probably set too low. You'll probably want it turned up and you should see the problem go away.

[ron]

hi,

a/c 's compressor draws a hug amount of current.

a skylines ECU is really good at adjusting the idle not to let the car stall. So check your alternator and battery with a dmm.

[rev210]

Originally posted by ron

hi,  

      a/c 's compressor draws a hug amount of current.

a skylines ECU is really good at adjusting the idle not to let the car stall. So check your alternator and battery with a dmm.

You could be onto something here. I've tried adjusting the idle. It works only when the idle is set (aircon off) to 1,100rpm which is too high for normal use.

Other than that it will 'hunt' and occasionally stall with the aircon on, as you hear the 'clutch' engage.

Everything else appears to run well though. I'm pretty sure I'm getting the power out from the alternator and battery.

[Doctor]

Makes sure your ACC is pugged in . (brown plug at the the back of the plenum)

Also pull it off and give it a good clean out.

Doc

[MrMayhem]

when your ac is applied the ac "idle up valve" lifts your idle to compensate for the extra loading. be checking that

[rev210]

Originally posted by MrMayhem

when your ac is applied the ac "idle up valve" lifts your idle to compensate for the extra loading.  be checking that

Where abouts is it?

Cheers

[MrMayhem]

as Doc said

back of the plenum theres a gold cad plated cylinder about 30mm diameter and 60mm tall its screwed to teh base block and has the forementioned brown plug

they ge carbonated up take it off brush it down make sure teh piston inside it is free

[rev210]

Cheers:D

[Steve]

Hmm, pretty sure the AC control is the purple plug, not the brown.