Rb20det Throttling Prob

[jnr_chin]

my rb20 when cold does not increase the throttle until warmed up. my main problem though which i think are tied together is that when i turn on my a/c it doesnt throttle up but boils down to a shut off.

i have cleaned the IAV and still no change

physical tests that i have carried out

1. when i plug off the brown plug on the IAV the car immediately shuts off (if the rev is held it wont shut off but when replaced with the same rev it goes up drastically)
   
2. when i pull the TPS screws and adjust in any direction i get no response
   
3. when i remove the plug off the TPS no response
   
4. when i remove the IAV and apply 12v to the pins the valve operates
   

what seems to be my problem?

[daisu]

1. when i pull the TPS screws and adjust in any direction i get no response
   
2. when i remove the plug off the TPS no response
   

I'd say that would be the main source of your problems. Get a multimeter out, the TPS has a 3 pin plug. 1 pin is 12V supply, one is a ground, and one is a 0-5V signal to the ECU. Find the 12V and ground pins, then measure between the ground and the 5V pin. You should get something like 0.5V with throttle closed and 4.5V with wide open throttle.

Or if you have a mate with a working RB20 in his car you could get him around and swap TPS to see if that fixes your problem.