Need help guys.. I swap in a 2000 LS motor into my 94 civic si Hatchback. Everything went well until I started up the engine. It idle about 2100 when the motor is cold and it would jump up and down from 1400 to 2100 rpm when motor warms up.
I've clean the iacv w/ brake cleaner and also used a different iavc(used) and still have the same problem. I've check my vavcuum hoses and radiator hoses but no leak. Bleed the radiator and still have the same problem. I also check my plugs and the right plug is plug into the idle control unit. No check engine light on(yes, it works). But when I plug the iacv hole in the throttle body it runs and idle perfect. Anybody knows whats going on here? Thanks guys.. Hope you all can help me out here.

 

dont have the canister purge and the iac or the power steering switch mixed up do you? what harness you using?

 

i have the same problem

 

I'm running my civic si harness with the P75 obd1 (94-95) integra ecu. I've also check the vacuum line and its correct. Hope that you can help me out, thanks again.

 

Still having the idle problem and need help...