rpm doesn't go up when a/c turns on (in drive mode) - 89 240sx?

[onosqv]

Ok, When the car is parked - 750 or so rpm. Turning on the A/C anywhere between 1-4, the rpms will rise to about 1k rpm.

However, when I'm in Drive (I have an auto), turning on the a/c at a stop (700-750 rpm), the rpms do not rise.

The A/C works, just the rpms don't go up, and monitoring this in certain conditions, this causes problems w/ powering everything I have on at the moment w/ just 700 rpms. A/C works fine and is cold and all otherwise.

Don't know where to first start checking for this as it seems weird.

Any help will be GREAT!Thanks

[s13sr20chris]

the idle is not really supposed to go up. its just supposed to hold steady. sometimes the ficd gets funky and will gain a few extra rpms or more frequently lose a few.

[onosqv]

Ok, so I'm fine? .

It just seems weird because before I totally modified all this crap in my car - when I turned the a/c on, it would go up 200 or so rpm - which I believe was used to help power the a/c & a/c fan, etc.

ficd?

Thanks

[ricebike]

ficd= fast idle control device for the ac system

located near the area where u adjust the idle w/ a screwdriver...zerothread?id=26039

Quote »The IACV-FICD valve allows air into the motor when the a/c system is on to compensate for the added strain of turning the compressor. This will bump the idle up if working properly.[/quote]i know in my car, this valve is working properly... it' ll bump up the rpms when the ac compressor engages & rpms will drop back to norm when compressor disengages.

u still dont have a manual for that car?

Modified by ricebike at 11:48 AM 9/14/2005
Modified by ricebike at 11:50 AM 9/14/2005