Throttle Body Vacuum Leak Repair

I took the car to Bavarian Motorsport and had a second smoke test. Found the throttle body to ICV hose leaked (at both ends and the elbow), and the brake booster vacuum elbows also leaked. All of these elbows are just pressure fit. Here’s what I did:

  • removed the air box, AFM boot and ICV
  • installed the TB to intake manifold gasket, which was missing before
  • sealed the brake booster elbows with black Permatex RTV gasket maker
  • fitted hose clamps to the ICV tube
  • sealed the ICV elbow with black Permatex RTV gasket maker
  • put everything back together and let it cure for 24 hours


I hate the way the hose clamps look but they’re necessary. So this worked great yesterday, but last night the car bogged after sitting for 2 hours. Now I wonder if the RTV sealant isn’t up to the heat of the operating engine.


Seems I forgot to tighten the hose clamps on the intake boot. Running better now!

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November 24, 2012 repairs