Need help ID’ing this component. Looks worn out and probably dead

[PsychoNaut04]

Id appreciate it. Just barely got this truck and trying to understand what needs work. 

[bilzbobaggins]

54 minutes ago, PsychoNaut04 said:

Id appreciate it. Just barely got this truck and trying to understand what needs work. 

Did you try googling the part number on it?  I cant make it out in the pics myself

[PsychoNaut04]

2 hours ago, bilzbobaggins said:

Did you try googling the part number on it?  I cant make it out in the pics myself

Just did. Apparently it’s a discontinued item—vacuum control valve. What do I use instead?

[Stoffregen Motorsports]

You can test them to see if they are bad.

 

If bad, just google 1984 Nissan vacuum control valve and find one that looks similar. It's likely to be a standard part across many vehicle lines.

[Stoffregen Motorsports]

You could probably get away with using one from another make. Like this - https://www.amazon.com/YMAUGP-Modulator-1995-1998-1995-1999-1995-1996/dp/B0BNKZ6N4G

[PsychoNaut04]

10 minutes ago, Stoffregen Motorsports said:

You could probably get away with using one from another make. Like this - https://www.amazon.com/YMAUGP-Modulator-1995-1998-1995-1999-1995-1996/dp/B0BNKZ6N4G

That looks promising. Just the two outlets sticking out in the back. Im wondering if it’d be good to seal them shut?

[datzenmike]

There are two vacuum switches. One turns the exhaust side plugs off under heavy load, low vacuum. The other is the fuel shut off under deceleraton high vacuum, clutch pedal up, transmission in gear. Truck will run fine with or without it.

[PsychoNaut04]

9 hours ago, datzenmike said:

There are two vacuum switches. One turns the exhaust side plugs off under heavy load, low vacuum. The other is the fuel shut off under deceleraton high vacuum, clutch pedal up, transmission in gear. Truck will run fine with or without it.

Would leaving out cause california smog to fail? 
i wonder what I can replace this part with. 

[Stoffregen Motorsports]

Either delete it (likely a smog tech would never know), or replace it with a similar part.

 

FYI - you can actually petition the CA BAR for obsolete parts. If you can't get the parts needed to make your CA vehicle smog legal, they will issue you an exemption. There's a dollar limit. I think it's like $1200.

Edited September 5 by Stoffregen Motorsports

[PsychoNaut04]

1 hour ago, Stoffregen Motorsports said:

Either delete it (likely a smog tech would never know), or replace it with a similar part.

 

FYI - you can actually petition the CA BAR for obsolete parts. If you can't get the parts needed to make your CA vehicle smog legal, they will issue you an exemption. There's a dollar limit. I think it's like $1200.

Thanks bro. Do I delete it by plugging the lines somewhere or how? Sorry im new to carburetors 

[datzenmike]

Definitely plug any hoses. 

[Stoffregen Motorsports]

10 hours ago, PsychoNaut04 said:

Thanks bro. Do I delete it by plugging the lines somewhere or how? Sorry im new to carburetors 

Just remove it from the system and run a new hose (without splices) to replace the two hoses connected to it, so when you go to get it smogged, it will look like it's supposed to be that way.

 

Take pics of how all the hoses are connected and file them away before you start changing things.

[Sephakrid]

I've been looking for the same part! I believe the Nissan part number is 22363-D1700.

 

One outlet receives a vacuum signal from the venturi. Once venturi vacuum reaches a certain level it will cause an air bleed inside the valve to open. The other outlet is connected to the ported vacuum source. Basically, this valve causes a vacuum leak in the ported vacuum circuit when venturi vacuum is high.