I have a 98 civic hatch with a 98 spec jdm itr motor and Im having issues more n more lately with the idle in this thing. Is has the symptoms of a bad iacv but its not bad and now the last few days its been constant when Im at a light waiting it'll go from 1100 to 200 n lately just bounces a few times n shuts off and Im lost I've been searching around n can't find an answer to myquestion n Im lost also my brakes have been weird after I turn when to left sharp I have to pump them up Im bleeding the whole system tomorrow so I dunno what's going on someone please please help me out on this issue

 

since you have a itr swap, did you convert the iac from the dx/cx harness to a two pin plug? what ecu are you running, I had this problem because it was originally 3 wires and I had to convert to 2 wires and repin the ecu correctly.

 

I'm pretty sure my buddy did that he runs the performance shop here cuz I had to have him do some re wiring on my cx harness to operate it properly for vtec n what not before this swap I had an Ls in it. As far as the ecu goes Im running a p30 with a basemap for an itr on it and its ran like a monster for the last couple months n still does but now that idle thing is giving me a problem. I tried the iacv trick where u get car warm n unplug it n it bogged down a lil but kept running so Im not sure what's up

 

Hmm next step is fast idle control valve or air bubbles in coolant

 

Cool fast idle valve huh Im gonna have to look into that or air bubbles in coolant that's wierd but ill look at that too thanks for the info someone also told me maybe my brake booster but that sounded wierd to me who know

 

you said it has a basemap for itr? Does it look for the o2 sensor? If not most likely your a/f ratio is out of wack due to anything from a vacuum leak to an injector problem

 

Thats interesting I not sure I'll have to check the code I'm throwing but it may not be looking for an o2 n if its not looking for it how to a go about fixing the air fuel ratio problem ?