calvinpaul

iTrader: (2)

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.

Unsupa

iTrader: (2)

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..

82transam

iTrader: (18)

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

Bass

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?

82transam

iTrader: (18)

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

j9fd3s

iTrader: (3)

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

calvinpaul

iTrader: (2)

Its gone, thanks.

specRX7_22

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

YnOhTnANaYrB

where is this shutter valve...?

calvinpaul

iTrader: (2)

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.

vipernicus42

iTrader: (4)

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

calvinpaul

iTrader: (2)

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.

shetlen

iTrader: (2)

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

eViLjAy

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!

82transam

iTrader: (18)

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...

j9fd3s

iTrader: (3)

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

nipper

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

YnOhTnANaYrB

but I dont have a carb...FI