Found empty vacuum hose connection, What did it hook to? Options

[SVG223]

Newly acquired 914, 1976 2.0. Has missing vacuum hose. Does anyone know what it hooks to? This causes the car to idle high, I put my finger over it and the idle dropped from 1700 down to 500 rpm. Is this causing a lean fuel-air mixture? Thanks

[SVG223]

You guys are great! That JeffBowlsby link even tells me the size hose it needs! The deceleration valve is there. What is strange is I got the car from a classic car dealer in Houston where they did a tune-up on the car before I bought it. The car takes a while to warm up, like it's a little lean, wants to die when backing out of the driveway. After it warms up it is fine. The tires are a little tall not sure if that is contributing 205/70-15.

[wonkipop]

You guys are great! That JeffBowlsby link even tells me the size hose it needs! The deceleration valve is there. What is strange is I got the car from a classic car dealer in Houston where they did a tune-up on the car before I bought it. The car takes a while to warm up, like it's a little lean, wants to die when backing out of the driveway. After it warms up it is fine. The tires are a little tall not sure if that is contributing 205/70-15.

if it is anything like an L jet the warm up weak idle might be due to the AAV (aux air valve). ie its closing too quick or not opening at all for extra intake air when the engine is cold.

[SVG223]

You guys are great! That JeffBowlsby link even tells me the size hose it needs! The deceleration valve is there. What is strange is I got the car from a classic car dealer in Houston where they did a tune-up on the car before I bought it. The car takes a while to warm up, like it's a little lean, wants to die when backing out of the driveway. After it warms up it is fine. The tires are a little tall not sure if that is contributing 205/70-15.

if it is anything like an L jet the warm up weak idle might be due to the AAV (aux air valve). ie its closing too quick or not opening at all for extra intake air when the engine is cold.

This sounds about right, I bet it's not opening at all. It dropped to 500rpm Ice cold when I covered the hole. Maybe I can take it off and soak it in something.

[wonkipop]

You guys are great! That JeffBowlsby link even tells me the size hose it needs! The deceleration valve is there. What is strange is I got the car from a classic car dealer in Houston where they did a tune-up on the car before I bought it. The car takes a while to warm up, like it's a little lean, wants to die when backing out of the driveway. After it warms up it is fine. The tires are a little tall not sure if that is contributing 205/70-15.

if it is anything like an L jet the warm up weak idle might be due to the AAV (aux air valve). ie its closing too quick or not opening at all for extra intake air when the engine is cold.

This sounds about right, I bet it's not opening at all. It dropped to 500rpm Ice cold when I covered the hole. Maybe I can take it off and soak it in something.

not a D jet man, but i'd guess the rev drop is because the idle is set currently with that extra air entering via the open port. its like you have an idle port without the adjustment screw. you will need to reset your idle with that port blocked or correctly connected to decel.

advice to cap the port for now if you can't hook up to decel valve is good.
its only a small port but its sucking in unfiltered air and ........dust/dirt.

you can run L jet without the decel. but i hear D jet needs it. as advice above says.

EDIT - you will need the car fully warmed up to reset steady idle.
then you can address the weak start up idle at cold.
the AAV is an older style on the D jets and i don't know much about them.
i'm currently investigating a weak AAV on my L jet.
its really only a bug bear on cold start and i kind of put up with it for now.
not much you can do with the AAVs on L jet except clean them out.
but the "springs" (electric heated coil) do go weak with age. i assume D jet AAVs suffer similarly.

[ClayPerrine]

you can run L jet without the decel. but i hear D jet needs it. as advice above says.

Not true. You really need the decel valve in the L-Jet to keep it from dying when the throttle snaps closed.

Clay