So i swaped my base motor out of my 99 prelude for a JDM H22A. And ran pretty strong for a few weeks, last night i got on the throttle getting on to the freeway. After that i noticed my car was running rich and heard a loud sucking sound like a vaccum hose was broken coming from under the manny...car runs good still but just isnt right.

Can somebody help me out...have any idea???

 

Possibly your IABs? you know, the butterflys in your intake mani. They run on vaccum and I suppose if they are closed when they should be open it could cause it to run rich.

 

maybe...would it hurt the motor if this came disconnected???

cuz the idle is rough...but when the car warms up..it runs like a champ

 

Doesnt sound like your butterfly valves, they are turned on and off by your IM pressure.

So the only issue you are having is that it runs rough at start up?

How do you know its running rich?

 

yeah at start up it runs rough...after it warms up it runs great...i can smell the fumes a lot. and when i first start it up it smokes alittle grey smoke...

please help...