H23a VTEC swap.... after going obd1 idle surges

[livetoride]

Ok guys just converted to obd1 with my accord f23a1 auto to H23a vtec using the old f23 trans. The problem i am having is on cold start up the idle surges 1-2k then after 5-10 surges evens out, but still high(around 1200rpm). when i put it into gear it jumps up and stays up. Under brake or powersteering load too. I am using a obd2 to obd1 custom split harness from boomslang w/ a p28 and my f23a1 ecu just to run the trans, a 95 h23 upper plenum. Im using the blue tops TB.

 

[Russianred]

Hard to tell.. Could be either an IACV issue, improper tuning, FITV (if applicable), or a simple vacuum leak anywhere in the system - could be from a vacuum line, to a leak in the intake manifold gasket causing it. Could be a variety of things. You're going to have to do a little more poking around.

 

[2002CG3coupe]

I look for vaccum leaks seeing how it literally a direct swap regardless of it being P13 or PDE.

 

[f20bcg3]

Smoke test that bish

hiding phone so boss wont catch me on 6th gen

 

[Russianred]

Try spraying starter fluid in areas of suspected leaks, if idle raises or any changes, then you know that's where the leak is. Another thing you can try if you have the resources is get a vacuum/pressure leak test kit, Harbor Freight carries them for like $16.

 

[slowe69]

i am haveing the same problem any codes ?? i have 14 thats the iacv the common issue and i belive its caused because the harness isnt going to the right plug in for the p28

 

[f20bcg3]

Did u wire the iacv correctly? Surges tend to be iacv issue

hiding phone so boss wont catch me on 6th gen

 

[slowe69]

thats just it did i ? black wire isnt used blue and black and yellow and black are

 

[f20bcg3]

Black wire is grounded to chassis black n yellow goes to top pin on iacv and blue n black is on bottom

hiding phone so boss wont catch me on 6th gen

 

[slowe69]

hmm on my plug in to iac the wires are yellow and black and blue and black same as the old 3wire one so i wired the back to the same but what your telling me is the opposite ok will try anyway