So I while back I started a JDM B20A Swap into a 1989 Si. I got as far as swapping the motor but I was not able to finish everything because I left to college. Well now I'm back home for the summer and I'm picking up where I left off.

The problem I'm having is extremely erratic idling.

I'll give you a break down of what the car has right now

Break down:

So, I have a 1989 Honda Prelude SI 4WS, I have swapped into it a JDM B20A. It has:
- JDM B20A motor
- USDM Transmission
- USDM Intake Manifold (ITM)
- USDM Exhaust manifold (EM) [with all o2 sensors, which connect to the (EM)]
- USDM Speedometer cable since I am running the USDM transmission

Problem:

I have started the car successfully and it drives fine, however when it comes to idling in the driveway or at a red light it is horrible!!! The idle is very erratic.

My Car:

YouTube - Erratic Idling



408

 

describe the erraticness. Does it wander from 1000-1500 rpm or is it almost dying?

Did you clean the IAC valve?

 

There is a video of it. click on the youtube link.

 

vacume lines