my car"91 integra sedan ls/vtec" idles @750/800 but when i turn on the a/c it idles down to 500 or so rpm it used to idle back up until i did the head swap
i need help"its sooo hot in florida"

 

nobody has an idea on this????????

 

i need help what compensates for the engine load with ac on

 

Fast idle valve on right front of throttle body. unplug connector and check voltage at the pigtail with key on engine off. Should be 12 volts. Check resistance on valve. I think it's between 8 and 12 ohms but it may be 8 to 15 I cant remember. If these check ok plug it back in and remove the top plate and crank the car. If you can push the center 'plug' down and the idle increases you may have a bad valve. Does the car idle up when it's cold?

 

it doesnt idle up cold??? maybe i have a bad valve

thank you very much "in advance" for the information