IAB, PCV, gaskets

[rendyx]

Today I decided to replace my IAB under Autozone's warranty to eliminate it in my "misfiring" problem (yes it returned ). I stuck the new one in, but this time, the aluminum piece between the IAB and the rest of the intake (I believe coolant runs through it) came off. The gasket there was a fiberous type, and is useless now. It appeared similar enough to the IAB gasket that I used an old one that had been on my old IAB.

When I started up the SHO, I performed the idle reset procedure, went to take a look under the hood, and heard a rattle coming from the IAB area. I pulled the hose off the canister purge port, and noticed there is no vacuum from the inside of the intake now. I played with it a bit, and nothing happened. I then unplugged the IAB. The car died. Previous, when Jason (yamahaSHO) and I unplugged it, the idle simply went out of control.

My current thought is that the gasket is slightly different, and is blocking off that port. As for it stalling, I suspect port would normally pull air in, and cannot, so it has insuffient air to run on. I'm going to try and find a gasket for both the IAB and the one next to it.

Now, does anyone know the part numbers for each of the gaskets? I suspect putting in nice new plastic-coated metal ones designed for where they're going would solve the problem.

Thanks for any help!

 

[rendyx]

Another note, is that line PCV system related? Am I better off disconnecting that hose on the purge port until I get some flow there? And just curious, what is that little tank below the airbox that's about 6" long, and 2" wide, with a couple hoses coming from it? I believe I've heard it's some sort of charcoal gas fume filter.

 

[Mr Anonymous]

The two gaskets on either side of the IAC cooler are technically different, but should be interchangeable. Did you make sure all surfaces were clean and smooth before installing the gaskets?

Are you sure you properly torqued both bolts securing the IAC valve? You shouldn't have heard any rattling, even with a bad gasket. Are you sure one of the ends of the gasket didn't slip down and out of position before you put the second bolt through it?

The CANP (canister purge) port has nothing to do with PCV, it's part of the evaporative emissions system. The box in the fender is the vapor recovery canister which is where evaporated gas goes, and the CANP valve releases the fumes into the intake system to be burned.

 

[rendyx]

SHOooo:
The two gaskets on either side of the IAC cooler are technically different, but should be interchangeable. Did you make sure all surfaces were clean and smooth before installing the gaskets?

Are you sure you properly torqued both bolts securing the IAC valve? You shouldn't have heard any rattling, even with a bad gasket. Are you sure one of the ends of the gasket didn't slip down and out of position before you put the second bolt through it?

The CANP (canister purge) port has nothing to do with PCV, it's part of the evaporative emissions system. The box in the fender is the vapor recovery canister which is where evaporated gas goes, and the CANP valve releases the fumes into the intake system to be burned.

I cleaned the surfaces very well, and scraped off the last bits of the old gaskets, then polished it with some B12.

The gaskets should be secured. Come to think of it, the rattle did stop after some driving. I wonder if something just happened to be loose in there that I didn't happen to notice. Either that, or the metal gasket rattled around some.

First we'll try new gaskets and see what comes up. That should probably solve any sort of leaks that may exist, and hopefully that no-vacuum condition on the purge port.

 

[Mr Anonymous]

After reviewing your posts concerning the other problems you were having, including the one with the missing runner-to-head bolt as well as the problem with the runners not staying closed, I suspect you still have a vacuum leak somewhere. Until you locate and correct it, it's probably a waste of $$$ to replace things like the IAC valve.

 

[rendyx]

SHOooo:
After reviewing your posts concerning the other problems you were having, including the one with the missing runner-to-head bolt as well as the problem with the runners not staying closed, I suspect you still have a vacuum leak somewhere. Until you locate and correct it, it's probably a waste of $$$ to replace things like the IAC valve.

That's what I've been considering lately. There may actually be one with the secondaries accumulator canister, and I'm getting a replacement to take care of that. I also keep forgetting that I should spray a little C&C cleaner around where that bolt was to make sure it sealed up properly.

I replaced the IAB a while back because it was faulty. This was after I attempted to play with it. I guess "if it ain't broke don't fix it" should've applied there!

Where else might I check around for less audible vacuum leaks?