Need help diagnosing a vacuum leak: intake side has a loud squeal...

[CampbellsChunkySoupra]

Intake side has a pretty loud squeal coming from it. i havent been able to get it to idle up with hitting everywhere with brake cleaner. it gets quieter and goes away right when i go from vacuum to 0psi and then into boost its not there. what could this be? is it blowing or sucking in air? its behind the intake manifold somewhere on the intake side behind the strut tower.

intake manifold gaskets? one of the hoses? need some ideas.

thanks.

-Tyler

 

[suprahooked]

Egr or the block off plate .

 

[xarewhyayen]

spraying a little bit of carb cleaner around suspect areas helps to pinpoint leaks...the idle changes drastically when you find the spot. from the sounds of the squeal you describe, probably intake manifold gasket.

 

[AF1JZ]

Do a vacuum leak test. After it's pressurized, using a spray bottle with soapy water, start spraying around the area you think its leaking and it will bubble up. Then you should have a starting point. GL

 

[GrimJack]

Or blow a smoke machine into your intake with the engine on...

 

[spoolint78]

my brother has the same problem in his mkiv.
turns out to be the intake mani gasket.
when we pushed the tb the sound changed.

looking into replacing it.

Spray it with water or carb cleaner and see where its coming from.

 

[CampbellsChunkySoupra]

yeah, its not really that easy getting carb cleaner on and around both gaskets..

any idea on what a set of felpros intake mani gaskets cost?

my motor is EGR-less. [JDM tyte]

 

[GrimJack]

EGRless doesn't really mean much - you still have all the same gaskets that are subject to leaking. The only difference is that you are checking block off plates instead of EGR components.

 

[CampbellsChunkySoupra]

yeah. we didnt touch that when we pulled the motor so i dont think it is the problem. however, i could be wrong. its a JDM swap so ill check that tomorrow. its loud as hell though. ive never heard anything squeal like that for a leak. i can hear it at idle and while im on cruise control. it drives fine though. tries to kill itself when i let it idle though.

 

[starscream5000]

You sir, have a rodent in there complaining about the engine running while it's trying to sleep in it's nest .

 

[SevenMKIII]

http://www.rockauto.com/catalog/raframecatalog.php

Intake manifold gasket set is $8.42 through rockauto.com

Toyota/Any year 87-92/Supra/Turbo/Engine/Intake Manifold Gasket Set

 

[CampbellsChunkySoupra]

alright. thanks!