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Got a Vac leak

This is a discussion on Got a Vac leak within the External Engine forums, part of the LSx Technical Help Section category; well i was studying my data from my tune and i coulndt figure out why i had such high power ...

  1. #1
    Senior Member Z28boy2000's Avatar
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    2000 Camaro B4C

    Got a Vac leak

    well i was studying my data from my tune and i coulndt figure out why i had such high power losses after i installed my FAST 92/92....sure enough i have a vac leak somewhere (i hope the intake isnt cracked) so now time to hunt for the leak, what lines should i be checking for and where should i be looking for a cracked line.
    2000 B4C Special Service Package Z28 - Kooks 1&7/8 Stepped 2'' - TSP Torquer V.2 - FAST 92/92 - BDR 4000 Conveter - Xtreme Trans Stage II - Full UMI Suspension - Pacesetter LT's - Comp Drag Shocks - Magnaflow - Cutout - ZO6 MAF - FTP LID - Street Tuned -

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    Veteran Hi-Po's Avatar
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    Did you install the new lower profile valley cover bolts?

    MAP sensor sits pretty awkward, did you make sure that didn't come out? I put a good solid bead of silicon on mine. Worked great.

    Are you sure you have all the EGR hose hooked back up, and properly?
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    Senior Member Z28boy2000's Avatar
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    Quote Originally Posted by Hi-Po View Post
    Did you install the new lower profile valley cover bolts?

    MAP sensor sits pretty awkward, did you make sure that didn't come out? I put a good solid bead of silicon on mine. Worked great.

    Are you sure you have all the EGR hose hooked back up, and properly?
    Yeah I did the low pro valley cover bolts, I'm gunna check the MAP sensor, where did you silicone the sensor?

    No EGR for me

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    Veteran Hi-Po's Avatar
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    Quote Originally Posted by Z28boy2000 View Post
    Yeah I did the low pro valley cover bolts, I'm gunna check the MAP sensor, where did you silicone the sensor?

    No EGR for me
    I have been up for WAY too long. Don't know why I said EGR, meant PCV. My bad

    I siliconed all the way around the sensor, let it cure for 5 minutes, then installed into the intake. I have had my intake off more times then I wanna think about, and its still in there firm.

    Did you make sure all the intake runner gaskets were installed properly and not cut or ripped?

  5. #5
    Senior Member Z28boy2000's Avatar
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    im gunna be pulling the intake off again just to double check everything, and ill defiantly be siliconing the sensor....i do have to check the PCV again but im pretty sure thats all good, but ya never know

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