I have a 76 280z and this is part of the throttle body. I just aquired an 1980 zx engine but the BCDD is missing. It is located on the bottom of the intake manifold and not the throttle body (see diagram). I was just curious what this does and if there another name it goes by?

http://www.classiczcars.com/photopost/showphoto.php?photo=14001

Boost Controlled Decelleration Device. When you get your foot out of the gas, it stabilizes the idle-necessary because of the abrupt change in vacuum-if I understand it correctly.

Will

Will is correct! It was a smog prevention device. Typically when you get out of the gas you will get a richer condition until the rpm subsides....the smog police didn't like this situation as you can imagine.

Thanks guys. I just called Nissan and they want $323 for a new one! eeeeeebay !!!!

I have a complete '76 engine I will sell you for less!

If you have a non egr intake, we could trade complete intakes...

Will

Actually I just bought a mint condition 1980 280zx engine that has been in storage for 25 years. Only had 1900 miles on it. So the BCDD that I need is for an 80 and it's located on the intake not on the throttle body. See diagram above also see the engine at:

http://www.classiczcars.com/photopost/showphoto.php?photo=14002

Follow the pvc hose to the left end of it, go straight up and you will see a flat spot on the intake manif. that's where it mounts.