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
-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

 

What kind of engine management are you using?

 

right now i am running a obd1 p72

 

do you have evap hooked up?

 

no i don't.

 

evap shouldn't matter since he is running an OBD1 ecu

 

Is it a stock ecu or does it have a map on it.

 

messed with the wiring by chance?? obdII to Obd I.. recheck or change out the tps and/or map. what throttle body are you using??

 

the ecu is a stock obd1 ecu

i bought a jumper harness, i am going to check that out.

 

thats your problem! Im 100% positive. Get that ECU chipped and order a base map for your motor! or just get it tuned!

 

well i figured it out. it was the pcv valve