Quote:
Originally Posted by Myrunr2010
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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The gaskets Toyota use aren't made for boost, especially after they've had 10-20 years to degrade. The torque specs are too loose for boost as well. My repeat offender is the lower plenum to intake manifold connection. It leaks if I don't torque it almost 2x as tight as it says in the manual.
It might be worth the effort the next time you do some work on the engine to take off the throttle body and upper/lower plenum and just replace them all and torque them down tight. That way you can rule them all out and get a more reliable tune.
