Air Cleaner Door won't quit flapping!!!

[sailingjeep]

I'm running with alot less than the stock emissions equipment and trying to get my vacuum lines in order from my changes and PO changes.

I've developed a problem where the trap door in the air cleaner intake tube is rapidly flapping open and closed. It had finally stopped doing it so I stuck a screwdriver up there to see what changed when I opened it, then it started flapping all over again and I can't make it quit.

[Crazy_Jeepman]

sounds like it came disconected from the vacume actuator leaving it free to flap. It should be hard to open it, takes Vacume to open it when up to temp. If the heat riser flex tube off the exaughst manifold to the air cleaner is not hooked up wire it open, or take it off.

[sailingjeep]

I like the way you think!!
The flex tube keeps falling off, I was thinking of getting rid of it. Do I need to cap it off, or just let it go??

[Crazy_Jeepman]

You can just let it go. It is designed to Keep the carb from icing up in the cold weather. Being as you most likely never have that problem I would toss the whole works, maybe even get one of them nice shiny dog dish air cleaners. :D :D :D :D

[CowKiller]

ok i have this flappy thingy, but no tubes conecting to it. do i need it?

[Bombadier]

nah, if you never see very cold weather.
If you're dispensing with the emissions entirely, ditch the whole air-cleaner pan thingy and use a "dog-dish" filter as CrazyJeepman calls them. smile.gif

[CowKiller]

it was 10 degrees out the other day. is this cold enough? my heat riser on the exaust doesnt work either but soon to get headers so i will loose the heat riser all together. the cardboard infront of the rad and the fan with a clutch are what are really letting mine get warm

[trssho]

This is a good post to remind everyone that they should check that door. Some of them will not open even when warmed up. I ran a screw though mine and it holds it open all the time. Actually both. I would not recomend getting rid of the fresh air style, it keeps your intake charge temp much lower. Check out my sig for my air cleaner setup.

[CowKiller]

dual intakes tubes?is that home made?

[irbob]

Is it the vacuum that is making it open and close or is it the air passing through the snorkle?

Which flap is moving? The one closest or farthest from the carb.

It may be hooked up to the wrong vacuum port if it loks like it is being mechanically moved.

One point about the flapper that is closest to the carb is that it should be closed when the engine is off. If your rig is hard to start then it is probly open.

The hot air flapper opens after a certain temp is reached allowing for cooler air to enter after the engine is warmed.

[mdill]

There are two doors, (on the later FSJ's any way) The inner door should close when the
engine is shut off and be open as soon as the engine starts. The outer door is for the
inlet air heat.
The inner door connects to intake vacuum though a reverse delay valve, (The valve is
there so the door does not close whenever you romp on the throttle) To test the valve
and door apply vacuum to the line just after the delay valve, it sould open up as vacuum
is applied with no delay, release vacuum and the door should stay open for ?? number of
seconds (I think is was like 10 sec but that is from memory) This door is to reduce the
amount of gas vapors emited from the carb just after shut down, and while then engine/carb
is cooling off.
The outer door should direct heated air in with no vacuum, (don't cap the heat snokel
without removing the door or it will act like a inadvertant choke) vacuum to this valve
is though a delay valve and then though a thermo switch in the air cleaner, to test
apply vacume to the thermo switch and if the temp is below ~70 degrees (from memory
so don't quote me on the exact temp) the door should stay on heat side, heat up the
thermo switch (hot air gun, or hair dryer) the door should open to cold air inlet, remove
vacuum and the door should stay open for 10 seconds or so.

The doors should never just flap around.

Mike D.

[sailingjeep]

this is good stuff. I think I do have the wrong vacuum port hooked to the door. It is the one closest to the carb that is flapping. I have to Vacuum motors on the intake, but the outer door always seems to be open. The inner one does close when the engine is shut off. The vac motor is okay, I checked it with the pump.

I just need to know what is the correct vacuum source to hook up to the inner motor? I have a less than stock emissions and vacuum set up. How can I make this part work right??
Thanks!

[sailingjeep]

Okay, I just reread your post MDill. It sounds like maybe I have them reversed. The inner door should be hooked to the line with the little round dohicky thing in it?

[mdill]

Both doors should have "little round do-hickys"(revers delay valves) in their vacuum lines,
from memory they are interchangable (same delay setting). The only differance between
in the vacuum routing is the outer doors line goes though the thermal switch in the air
cleaner housing, then both lines tee together and go to manifold vacuum.

Mike D.

[irbob]

Well what's the status?

[JeepBountyHunter]

trssho.........Hey nice job, did you just rivet a spare intake snorkel to your stock aircleaner assembly? Where does that intake hose goto on the new one?

[Millerluck]

Well this might getme in trouble. But here goes.

I never put that ugly under sized junk of a heat tube that came with my headers on. The thing is a piece of pipe that they expect you to hose clamp to a header pipe. yeah right. :rolleyes:

So I made sure that dang outer door stays down.

Next I found one day the inner door was half way shut. So I took a long screw driver and broke that plastic piece of junk right out. :D

I agree with keeping a fresh air hose hooked up.

Later

Larry Miller

[trssho]

Originally posted by chiefwidetrack:
trssho.........Hey nice job, did you just rivet a spare intake snorkel to your stock aircleaner assembly? Where does that intake hose goto on the new one?I bought a spare off Ebay, and grafted it on there. Welded and painted. With the K&N, definately helps.