92 civic vx hatch d16z6 swap idle issue

[Loweghatch]

Car is a 92 civic hatch vx with the d16z6 swap from the si in it, when car is idling it constantly revs from 1,000rpm to 1,500rpm and does this over and over, I have a giant fart can so its super annoying, how can I fix it

 

[CAFROG]

Double check mechanical timing. Make sure your timing belt isn't off a tooth or two.

Double check electrical timing.

Remove and Clean/Soak the IACV in some carb cleaner.

If that doesn't fix it, remove the FITV and clean it. The FITV has a threaded plug that may have loosened.

IACV is dirty if it's hunting idle after motor gets to running temps. FITV may be bad if it does it at cold starts.

 

[Loweghatch]

Should I just replace the FITV with a brand new one?

 

[CAFROG]

Check the things that I refered to in sequence and then get back to us. FITV is the last thing I'd look at. But, yes OEM new are not that expensive.

 

[dveit]

If it's not your IACV or FITV, it sounds like it could be a vacuum leak. Check all your vacuum lines to make sure none of them got disconnected.