94 civic 98 ITR motor runs great no cel's but it will not idle for **** unless i pull the vacuum hose off the FPR ?

also i noticed when i put my hand over the throttle body it doesnt suck at all at idle ?

motor is all stock socketed p28 ecu

 

any ideas?

 

well im off to bed... thought id give a bump before ! hope someone can shine some light on this issue for me :-)

 

Sounds like your Idle air control valve is not functioning.

 

The throttle plate should be slightly open at idle. If not, someone may have messed with the throttle stop screw, which should not be adjusted.

 

the throttle screw is all ****ed cant even adjust it and i was thinking the iacv but wanted to be sure before i go spend money on one

 

anymore ideas?

 

Are you sure the IACV is wired properly? I'm assuming you used the EG wire harness and extended wires as necessary?

 

all wiring was fine didnt have to extend anything ! everything is plugged in and i have no check engine lights ?

 

Did you just swap the motor in your car?

 

it was in my buddys car ran great for a long time then it started to do that he couldnt figure it out he tried cleaning the iacv but didnt work and yes now its in my car

 

So I take it you are using everything from his car. ECU, dizzy, and engine harness.

 

everything except wiring harness used my harness and just wired in vtec

 

I would try to bleed out the any possible air that could be in your cooling system then IACV. That is most likely the problem. If not try another ECU and or dizzy.

 

tried a ecu didnt work.... i'll try bleeding the cooling system ! i have no access to another iacv or a distributor though :-(

 

update ! so i unplug my iacv and it runs way worse so its working

iat is working and cts is working tps i havent checked yet

but im curious do throttle bodys go bad?

it does not suck air at all when idleing

 

Check that the IACV wiring is good:

Check for continuity from the blue/yellow wire on the IACV plug to pin A9 at the ECU, and the yellow/black wire continuity to pin B1 and/or A25 and let us know what you find.

Also, just to note with Key on engine off - yellow/black should have +12 volts. If the yllow/black wire does not have +12 volts with KOEO, but has continuity to pin B1 and/or A25 then the IACV control within the ECU is fried.

 

k thanks i will check later today and let u know

 

k i tried 3 diff ecus so im sure the ecu is fine

all tests are checking out to be fine ! as well as i stated i have no check engine light !!!

car runs great just wont idle without a vacuum line removed !

 

any other ideas guys? or tips ? im racking my brain here

 

Is the screw on the TOP of the throttle body screwed all the way in maybe???

 

i believe so and its all ****ed up i cant adjust it at all

 

Is the EVAP purge solenoid nipple on the Intake manifold capped off or plugged in?
I remember my car idled like crap until i capped that.

sucks about your throttle screw

 

where the heck is that at on a type r motor?

 

still no ideas ?