Leaderboard

I dealt with this right after buying my '92 and can lend a lot of points, don't know how I missed this thread. Mine was leaking too and the nipple on the intake tube was broken off just like yours. I ran a screw into the hole covered in RTV temporarily which sealed it up until I could build a new intake tube, capped the one on the plenum, and removed both lines completely. This eliminated the ATF suction into the intake, but not the leak. Soon after the pump went out anyway, turns out the original owner had filled it up with regular PS fluid so I bought a reman pump for $129 at Advance, during install I remove the vacuum idle up switch and bought a pipe plug the correct pitch, sealed it with RTV, and completely deleted the switch altogether. Flushed and refilled it with ATF and it's been perfect ever since. The car drives completely fine without it, on Nissan cars they use an electrical switch and I've deleted those in the past on numerous cars I've worked on due to leakage, the only change is the idle drops about 100rpm when the steering is at full lock, but how often do you drive at full lock? Maybe .0001% of the time. You'll never notice it gone. After I did my timing belt I had the intake manifold, plenum, and throttle body all hot tanked to clean out the years of soot and gunk as well as having all the extra vacuum ports, included the one pointing out that used to go to the pump, welded closed. I prefer this as vacuum caps can become brittle just like hoses do, especially with the underhood heat the LS puts off. If you can't go that route, a bolt/screw of a larger pitch can be threaded into the port or you can pull the port out (it's just pressed in) and thread something into the aluminum casting of the plenum. The difference after that was very noticeable as they entire intake tract was now clean for once in maybe 120k miles. While I don't suggest you do all those steps, removing the switch and plugging it will solve your leak and not affect the engine one bit. It's also two less hoses to continually check on over the next several years.