Does this do anything really imporant other than bring your rpms down quicker on deceleration? If I were to go in and remove it would I cause any problems? I have already removed all the emissions, including the cats. 85gs.

 

shouldn't cause any problems. I have a manifold in my floor that i removed the shutter valve from, i just don't have a new gasket to replace the old one with..

 

you can remove it, it sucks, just be sure to plug the holes real good, don't want air/fuel mix leaking out.

 

I disabled mine a few years ago. Something that I've always wondered though was, could it possibly move or close at all? Or does it normally rest in a fully open state?

 

if it was open when you plugged the vaccum lines then it should stay open

 

its there to keep the cat temp down on deceleration, if you have no cat its not needed

 

Its gone, thanks.

 

I thought the shutter valve's purpose was to cut fuel to the rear rotor under deceleration to prevent backfiring (emissions)?

 

where is this shutter valve...?

 

If you are looking from the inside of the car, it is on the left side of the carburator, hidden by your rats nest on the inside of the intake manifold. The shutter itself is inside your intake manifold, and you will not be able to see it unless you take off your carb.

 

Take the carb off and remove the diaphram itself. Plug the holes in the intake manifold with JBWeld. Leave the butterfly in place because taking it out will result in major turbulance. The butterfly should be JBWelded in the FULL-OPEN position.

I haven't noticed any real driving problems without it, but then again mine never properly worked since I've had the car. The main advantage I see of removing this is that the Rx7Carl/Sterling carbs have a longer Accelerator Pump arm, and removing the shutter valve gives it clearance to properly move. That's the reason I removed mine - that arm was binding.

Jon

 

Opps, I just cut the butterfly out and everything. I couldn't get the screws out so I said to hell with it. Out popped the dremmel....I haven't really noticed a difference, sooo oh well I guess.

 

I took mine out no problem plugged the hole with silicon covered dowles also ported it while I had it off

 

Mine is coming out today if i get around to it. A friend of mine pulled his and now his car idles smoother than i thought was possible for an fb. It has to hurt flow and if its not doing anything productive i say its got to go!

 

afaik its there to lean out the rear rotor and thus reduce emissions under certain conditions (like decel in gear) Whatever it does the NJ smog sniffer doesn't seem to care, because mine is plugged and it passed fine. Guess it has no effect in 2nd gear at 20 mph. Strange...

 

its there to reduce unburned gas going into the cat on decel, it does this by cutting fuel to the rear rotor. the anti afterburn valves are in or next to the acv

 

I simply plugged the lines going into the thing when it was giving me a problem and now the car runs very well.

 

but I dont have a carb...FI