thermal vacuum valve

[cedar]

i searched the forum for a bit and didn't find anything so i thought i would ask.

the top two vavuum lines attached to what i am fairly certain is a thermal vacuum valve are broken off. does this matter much?
should i replace the TVV? or can i just forget about it for now.

this is an '84 720 Z24 its a 4x4 with ext cab


here is a pic. it doesn't clearly show it, but the top two lines are completly broken off, they just happen to be resting where they should be in this photo.




thanks!!!

[breadbox]

yeah I was about to ask about that thing too. I want to plug it up is that a horrible idea?

[breadbox]

We figured out the round white plastic thing under it in the pic with two vacuum lines retards the timing after a preset something something.

[4wheelsoffury]

from what I know (cause I broke mine trying to replace vac lines) it opens the egr valve, when the coolant temp gets hot enough this tvv sends vacuum to the egr, newer cars have a solenoid that does this. I capped off the lines to the tvv after I broke the connectors, and was planning to get a new tvv, but it has run just fine for over a year.

[PEZi]

Mine is all plugged as part of the emissions delete.

[cedar]

thanks for the replys!
pretty much what i figured, i'll probably just plug it for now.

[breadbox]

woot.

[synack7350]

yeah it controls the egr, its not necessary for running good just more emissions crap. mines plugged. as with every other port except the vac line to the dizzy.

[heyman421]

It also retards the ignition during choke by defeating the vac advance while the engine's cold.

[Rev_D21]

According to my 82 FSM it controls distributor vacuum advance. If the valve is open it will stop distributor vacuum from advancing.

[synack7350]

why would you want that too happen rev? that doesn't make any sense.

[Rev_D21]

I guess the valve controls timing until the engine is warm. This is coming out of a 82 FSM.

[PEZi]

^ yep

Once its warm it runs as if it were plugged, it only does something while the truck is cold. Not really a key part.

[synack7350]

lol I hate retarded timing!

[Macks96HB]

Could this be my issue?

96-hardbody-won-t-stay-running-help-please-t537053.html

Help me please!!!!!