i'm having idling problems with my swap. Its fusrating that I can't figure out whats wrong with it. Before the swap went in I replace everything from piston rings to rod bearings to something small as camshaft seals.... I went through 3 different used iacv valves before i decided to get a new one. Before I was running a obd1 p75 but the idle jumps, so i started using my chipped p28, which it idles fine, but runs rich since its a vtec ecu. Replaced the iacv (new one), went back to and different a p75 ecu. I changed the throttle body and now when its cold it idles at 2.5k and then jumps up and down.

The swap is an obb2 b18b1 and its in a 97 civic ex. I'm using a 97 civic ex harness which the primary o2 sensor was extended. Also i took the car to a shop and the dude extend the vtec wire to plug up manifold pressure switch.

I was under the impression that all obd2 d16y8 harness came with a plug for the crank sensor, but this one doesn't so this is the reason why i'm using an obd1 ecu..

Any thought to what the problem is???

 

My b18b1 does the same thing.. I've replaced the IACV but didnt help much and I put my D series FITV on it. It fixed it for a while but im thinking that it is bad now. Try replacing the FITV, it is right under the throttle body.

 

mine was like that. come to find out i had a vacuum leak.

 

the tb before didnt have a fitv, but the one now do, i'll look into it...

ZAK, what vacuum leak was it?