hello, i have just finished my b20vtec swap in my 1997 gsr. the car starts and idles great until i touch the gas then let off the gas. when i let off the gas the rpms will drop very low and die. when the motor dies i can hear the iacv making a humming/buzzing noise. i know that it is the iacv because the noise goes away when i unplug it.
here is a list of things that i have done to try and fix this.
-clean the iacv
-swapped the iacv with three different valves
-swapped the ecu (currently running a OBD1 P72)
-measured the voltage of the iacv plug
-i have tried to set the rpm with the screw on the throttle body(when the iacv is unplugged the car will die)
-checked the tps
-changed map sensors


so any and all help will be appreciated very much
thanks a lot bill

 

Any codes? Can you adjust the TB screw to get it to idle?

I haven't had an IACV on my car in years and it idles fine.