Allant

Hey guys got a quick question, I've had trouble with vacuum leaks ever since I bought this car a few months ago. Narrowed it down to the PCV valve below the intake manifold, replaced it and seems like I gained some power and the idle smoothed out a bit. I also replaced all 6 check valves with the cheapo ones @ usplastics and replaced the Suction jet pump and hoses around it.

With the new suction jet pump, I am hearing a decently loud hissing sound coming from it. If I pinch the L shaped line coming from the manifold the hiss stops, if I pinch the hose attached to the bottom of the suction jet pump, it also stops.

So I went and bought another one brand new OEM from the dealer locally and put it in... same hissing sound!!

Is this hissing that I am hearing normal for the suction jet pump?

Just so you have an idea of the part I am talking about here is a picture:

lyleswk

Never heard any hissing unless there is a leak. I had one of my one way valve crack and it was not easy to figure out where it was until it came completely apart. Have you looked at the one way valves?

Allant

Replaced all 6 check valves with some generic ones from USplastics. They seem to be working well.

It feels like the car is losing power, and I think the diverter valve has gone bad because of a flutter noise when throttle is released.

Maybe replacing that DV will solve the loss of power issue. And definitely going to have my mechanic do a smoke test soon to figure out this annoying vacuum leak situation.