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#1
09-01-2005, 11:43 AM
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Vacuum Leak at TB
I can hear a constant sucking of air sound coming from right around my throttle body, I couldn't pinpoint it from the 10 seconds that I tried to figure it out. But I thought I remembered something about a vacuum leak problem at the TB being common?? I've had this problem for a while, but i've ignored it because when I punch the gas and let off, it kind of sounds like a small quieter blow-off valve. Again any help appreciated...trying to get this thing ready to sell!
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1997 Mitsubishi 3000GT VR4 - 269AWHP/290AWTQ (Mustang Dyno) - [email protected] - 1.756 60ft. - [email protected] (Best TDO4-9B Time) - Driver Mod - IPS TD04-19TL - SPEC 4+ - Wiseco Pistons - 3SX Custom Forged Rods - PMP FMIC + Much More. 
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#2
09-01-2005, 11:28 PM
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Re: Vacuum Leak at TB
Could be your idle screw or whatever they are called. I believe there is a cheap rubber washer that goes around them, it gets old and dries out...and can cause a leak. Also, perhaps the gasket of the intake pipe? I know on vr4s, the y-pipe gasket can leak.
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96 3000gt vr4 -K&N FIPK -Proboost mbc -Cusco front + rear strut bars -Greddy type-s -ATR downpipe -no cats -15Gs, 3sx aluminum pulley, FMIC, SAFC, walboro pump, EVO 560ccs, and Meth Injection Kit all waiting to go in shortly. Your 1996 Mitsubishi 3000GT VR-4 is the 92nd out of the 315 that were made that year. Only 21 of which are exactly identical.
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#3
09-04-2005, 02:39 AM
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3 things that will eliminate the boost leak there
#1 - vacuum reduction mod #2 - replace the idle screw o-ring #3 - replace the throttle body/intake manifold gasket
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Daily Driver: 2004 Jeep Grand Cherokee Special Edition 1994 Mitsubishi 3000GT SL-TT Automatic - Black 3.05 L Arias Forged Pistons, Pauter Forged Rods, DR Stage 3 heads, 3SX TD05 kit w/ E16G's, CX Racing FMIC, 550cc injectors, Walbro 255lph pump, + supporting mods 1994 Mitsubishi 3000GT VR-4 - Black Intake & Boost Controller so far 2006 Sea-Doo RXP Supercharged, Updraded SC, IC + supporting mods
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#4
09-04-2005, 09:34 PM
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Re: Vacuum Leak at TB
i had the same thing.. just hold ur finger where the screw is.. if the sound goes away, then get u the rubber cap thats supposed to be there.
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#5
09-05-2005, 12:10 PM
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Re: Vacuum Leak at TB
and if that all fails, try the emissions plugs... i took the emissions off my car so i have 3 empty plugs that i had to cover, and the plugs keep coming off so i put black silicon on them and plugs it... and try the little one way filter on the back of the throttle body.
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