my car runs fine until i get off the highway or after i enter vtec but when it comes time to stop the idle fluctuates from 1k to 2500 sometimes. i took off the iacv and cleaned it out with brake cleaner, let it dry out for 2 hours and messed with my sunroof trying to get it to open, then put it back on. it does seem less rough but the problem still remains. should i just buy a new iacv or is it something else? if someone could tell me how to check for a vacuum leak that would be awesome.. also i want to try to change the tps but idk which ones are interchangeable between honda motors, can someone please help with this...thanks

 

Easiest way to find a vacuum leak is get yourself some Carb cleaner (not brake cleaner!!!) start ur engine n spray it around your vacuum lines and where your TB meets the manifold & manifold meets the head. if there is a leak the RPM will jump up a bit.

 

make sure your coolant is full and no air in the system, also check your fiv http://www.jdmuniverse.com/forums/ho...-idle-fix.html

 

thanks alot ill try it tomorrow

 

i had a problem just like that with my ef9 b16a... i just changed my throttle body... turned out my fast idle screw was bad...

 

let me kno if it works..i need to do dis

 

one of these things will most likely work ill let u know which one.

 

yup up and down idle is almost alyways and vaccum leak, make sure there are no unhooked vaccum hoses, or bad/leaking gaskets in the TB and manifold

 

LOL I ment Carb cleaner not carbon! hahahah my bad I fixed it in my previous post.

 

The TPS could also cause some issues but it's more likely a vacuum leak. Vacuum leaks tend to be worst at idle and smooth out at higher RPM's.

 

i dont even have a fiv and dont think its a vacuum leak.