Quote:
Originally Posted by gamefreakgc
I'll try and explain as best I can. Under the throttle body you've got a vacuum hose that goes from the IAC valve to the intake manifold where it t's to both engine banks. This hose supplies air to the injectors which helps atomize the fuel at idle and low speeds. Under vacuum it's not an issue but on a supercharged engine it's a massive boost leak as you'll have pressurized air actually exiting the intake manifold, past the injectors and back into the throttle body/intake. Toyota addresses this by adding a one-way check valve to the hose to keep boost pressure from escaping.
My thought is with a turbo the entire intake is pressurized due to the turbo making boost before the throttle body and makes this a non-issue, but maybe not. You could add a one-way check valve to the IAC hose if you want to see if that solves it. Should only take $5 and 5 min of your time. You'll want the flow of air to go from throttle body -> intake manifold.
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Interesting. Thanks for that!
I have been dealing with some boost leaks around the IAC, but I think it’s the gasket that secures it to the TB. It’s hard to tell exactly where it’s coming from when I do a leak test though.
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97 4runner SR5 3.4 manual
Tundra/LC Lift with Bilstein 5100's on 285/70/17 BFG KO2
2" "Fat Pats" body lift; 1.25" All Pro wheel spacers
Turbo Build;
Rear Bumper Build;
Front Bumper Build