so under the manifold of my 87 turbo is a little plastic thing with vacuum hoses to it ,but it seems to be broke .it slips in and out of itself.what is it?

 

That would either be the Cycling Valve (if there are 3 hoses going to it) or the coolant temp dependent switch for evap emissions if there are only 2.

The Cycling Valve is ~$100 and regulates the boost pressure on stock configurations. You could consider this a very opportune time to upgrade chips, wastegate and boost control, or just replace the CV.

 

i have upgraded wastegate and exhaust ,and chips are coming ,what do i do with CV?

 

Most likely you'll need to delete the CV and replace it with a manual or electronic boost controller. What chips are you getting?

 

Can you take a photo?

 

yes can take picture ,but dont know how to put them on here. i d have a electronic boost from vitesse here ,guess ill put that on.

 

whats going to happen if i just fix the cv and have my exhaust and wastegate?

 

sure its not the thermo switch with the 2 little rabbit ears that snap off "oh so easily"...?

 

ya no its as big as a finger and y,s off ,but has gottin old and it pulls apart ,but i can slide it back together .

 

Sounds like the venturi valve

 

Does it look like this?

 

thats it

 

Venturi tube, do yourself a favor and do a venturi delete. It will really clean up underneath the intake manifold and get rid of all those 20+ year old brittle parts.

 

ok done. thanks