408Honda

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:




408

Colfax

You have a bouncy idle. The most common cause of this is low coolant level or not bleeding your coolant properly when you re-filled the cooling system. Try bleeding the coolant and report back what you find. There are several potential causes for a bouncy idle, but try the easiest fix first. Here is a link that talks about a few of the possible causes..

Bouncy Idle Fixes



I see that your cel light is on. I don't think that low coolant would cause that. Read the trouble codes and post what they are. If you are not sure how to read the codes, use this guide...

ECU Error Codes

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89 Prelude 2.0Si 4WS
91 Prelude Si - SOLD

joshtesh

its ur TPS (throttle postion sensor) or idle control valv