Thread: How long should a pressurized intake hold pressure?

I have found a few leaks by pressurizing the intake through an adapter on the throttle body. I have also,done the carb cleaner trick as well. I have really bad hearing so it's hard to pinpoint where a leak is coming from. I've had leaks from the maf, iac, upper intake under the supercharger, octopus on the top and an injector o ring. I just found a leak in the coolant loop thingy under the throttle body and sealed that up. Now if I pressurize the intake upto 20 psi it takes about 20-30 seconds for it to bleed down, no some or all might be coming from my contraption itself. The last 10 psi takes the longest to bleed. Does that sound acceptable?

I have a cap with a one way air valve like on your tire, and it's clamped to a silicone coupler and that's clamped to the throttlebody. Then I plug the lined at the octopus thingy, and the port off the throttlebody that goes to the,purge solenoid. I have no boost bypass or egr so no leaks from there. I have a vacuum guage at one port at the octopus, and I add air through the throttlebody and watch the guage and spray soapy water all over and look of bubbles. I have done this numerous times on this motor as well as others. Sometimes I can't access certain parts of the engine as with carb cleaner it has to be upright, so a spray bottle gets the solution there.