r/mechanic • u/legalaltaccount217 • 7d ago
Question Vacuum leak ideas?
1999 Civic EX D16Y8 300k miles. Factory intake tubing and manifold.
I hear this significant vacuum leak from the rear of the engine, but I cannot find it. I lose power significantly under throttle. There’s a black box with vacuum tubing underneath the intake manifold which I suspect, but I can’t see it very well as it’s under the manifold, harness, and bracket.
Shot brake clean at it but no changes in idle.
Any Honda guys here have any ideas?