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Loud Hissing Sound Posted by Jawerdna [Email] (#2022) [Profile/Gallery] (more from Jawerdna) on Wed, 5 Oct 2016 15:31:27 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I'm experiencing a high/inconsistent idle around 1500 as well and am trying to eliminate any possible vacuum leaks. I know this is going to immediately sound like an obvious one, but I'm pretty sure it isn't. The vacuum hose coming off the intake manifold and going to the large vacuum canister in the passenger side wheel well is making a very loud hissing noise. I've checked the bushing on the manifold, the nipple, and the hose itself and all are in good shape. I've even tried a new hose and it's still very loud. Loud enough that you can easily hear it from a few feet away and with both cooling fans running.
The sound is definitely emanating from the hose but I've got no idea what's causing it. There are two other hoses coming from the same nipple and neither of them make any noise.
Also, what is the proper diameter vacuum hose I should be using?
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