I have a 92 accord and it ildes from1000 to 3000 rpms constantly. From viewing the engine while it was running I also notice that there is an air leak from the intake manifold that meets with the head, so obviously I need a gasket for it because it looks like most of it came off some how. But anyway, I know that the fitv controls the idling right along with the iacv. My ecu is throwing a code for the iacv. I disconnect the harness from the iacv and it seems like it work when I take it off and put it back on. The number 13 hose is diconnected from a black box from under the intake manifold. It looks like it broke off from it because its broken plastic stuck in the hose. What is the black box for and what does it do? Could it be the reason why my car has rough idling?

 

Well it sounds like you definatly have a vacume leak. First of the gasket you are talking about that is gone you need to replace that. The black box you are talking about underneath the IM is your IAB box. you could leave it as it is but you would still have a leak so if I was you I would get another one and hook the vacume line back up. Also for your IACV take it off and clean it out with some carb cleaner and put it back on. Well that should fix your idle problem once you do all that.

 

I cleaned out the iacv with carb and still nothin. Its problably just a faulty iacv

 

also try putting some good fuel system cleaner in your tank the next time you fill up.my car used to idle rough like that then i put in some cleaner and about a month later i was straight.if that dont work you probably need a new iacv.

 

Fix the intake manifold gasket leak and ALL other vacuum leaks before messing with the IACV or FITV. Then clear the engine codes and start over. Do a search for responses by me last year on idling threads and fluctuating idle as well as IACV and FITV. I got very detailed in the causes of these issues.
Try this one.

https://honda-tech.com/zerothread?id=1510846

His cause turned out to be a vacuum leak at the intake gasket, sounds like your problem as well.

 

Where can I buy the iab box from. All the other ones I get from the junk break easily

 

It was definitely the intake manifold gasket.

 

Glad you got it fixed. If you have a vacuum gauge that you can connect to the intake and you don't have any valve or ring issues, a healthy vacuum should be between 19 and 21 in Hg. If it is below this, I would look for some more leaks. If you don't have a hand actuated vacuum pump/gauge, it would be $30 well spent. Everything that has a vacuum line running to it must hold vacuum. This will allow you to apply it where needed and is usefull for sorting out EGR problems as well.