The car has been having idle problems right after start up, upon vacuum testing my motor I ran across these items that need attention. I appreciate very much anyones time to answer my questions, thank you The car is a 1991 TurboII

1.) This line is leaking air at the fitting, its a hardline underneath the intake manifold, what is it?



And a close up shot



2.) Next my question is should this air pressure relief valve be routed with a hose to my intake pipe and recirculate, or should it vent to atmosphere as it is currently doing? I am not talking about my Apexi blow off valve, lol.





3.) Last one. What is this sensor with the cut wires, and what does it do?

 

First one is your oil injector vac line. The hose should not be hard. I would replace it with a new silicon vac hose. The hose should be attached to a four channel splitter plastic piece towards the other end of the upper intake manifold next to the firewall. Just watch out, the four channel vac connector is sometimes brittle.

 

make sure your vac lines are the right size so they fit tightly. Most of them are 3.5mm or 5/32" to get a tight fit.

 

The round fitting the hose is connected too appeared to be leaking air durring a vaccum leak test around the seem, the soapy water was bubbleing, is that possible? and is the fitting hard to find if so?

 

Second one is for emission purposes. If you don't need emissions cap off both ends or remove the end on the block and replace it with a block off plate.

 

Since it is for relieveing pressure, if i cap it off, will it damage anything? also will recirculateing it to my intake pipe be a good idea.

 

http://www.hosetechniques.com/

arghx is right about the size. Usually those old hoses become really hard and very brittle due to heat. I would just replace them along with all other vacuum lines that you have.

 

That's why you have a blow off valve. Though like i said it's for emissions only on the engine. I took mine off a long time ago. Personally i forgot what it called. I think its either the BAC (Bypass Air Control) or ACV (Air Control Valve).

 

ACV I believe. Well thank you have both have been very helpful. Now all I need is the identification of 3.) that cut sensor and I should be good to go until my next encounter. Learning as I go

 

Yeah, i just came back to this forum. Still learning as well, lol. Personally i'm not sure what the sensor is for.

 

Thats cool, maybe someone else will know.