Help Identifying Hose

[Pete1122]

I am hoping some of you experts can help me identify the hose in the attached picture. This hose appears to have a vacuum leak, I need to replace it but I cannot seem to find the part number or reference to it.

This is on my 1993 Nissan 300zx NA Convertible.

The picture shows the hose with a blue stripe I drew on it. This hose attached to the hardlines right above the PVC valve on the drivers side. It appears to curve around to the back on the engine. I am afraid this is going to be a nightmare removing and replacing, but my first step is to find a replacement hose. Any help would be great!

Mike

[itsa300zx]

I don’t think the hose you marked is a vac line, I’m pretty sure it’s a coolant line for the throttle bodies running under the plenum.
Here is another view of that same coolant line from the rear(red circle). As you can see it attaches to the coolant heater tubes.

[Pete1122]

I ran a smoke machine through the intake and there was substantial smoke from that location. The only other place I can think of would be the PVC rear hose connection, however it's a new hose. Is there anything else around that area that would leak under vacuum?

[itsa300zx]

The only intake hoses in that area I can think of is the idle air hoses just above mentioned hose.

[Pete1122]

That was it! Thanks for the info, the Idle Air Hose was leaking.