I just finally got my truck back together after a head gasket job. It's been out of commission for 7 long months whilst I stumbled my way through. Anyway, it seems to run really nice now except for a couple things - it has an exhaust leak I need to pin down (probably the y-pipe or down-pipe is misaligned at the turbo) and the reason for the post - it has an odd hiss periodically. At idle, it will suddenly have a hissing sound from around the turbo area. Then it might get suddenly louder, or suddenly quieter, or just stop entirely. Here's a short video of the hissing "event" - hissing starts at 5 seconds in, amps up at 17 seconds in, then down at 29. I cut off the video a bit prematurely, technically it was still hissing at 29 - just at the lower volume level. The 1st 5 seconds is no detectable hiss. Feeling around the CAC tube rubbers I don't detect any leaks with my fingers. Having a hard time pinpointing it. Any thoughts?
gephro
Sounds like an exhaust leak, when the vanes cycle at idle it will get louder/quieter with the EBP.
Sent from my SM-A505U using Tapatalk
Sent from my SM-A505U using Tapatalk
Setup an air test on the turbo inlet -- 4 inch Fernco and pvc pipe cap with a tapped air fitting -- the regulated air at about 10 psi(more if your plumbing job is good)
you can adapt this to the exhaust pipe as well
that way you can test with the engine off
be sure and remove the oil fill cap
you can adapt this to the exhaust pipe as well
that way you can test with the engine off
be sure and remove the oil fill cap
I found my up pipe was misaligned (badly). It was not hard to correct other than getting to the exhaust manifold bolts - removed the v-clamp, loosened the manifold-to-up-pipe bolts, aligned and re-clamped the v-clamp, then tightened the bolts back down. I think I'll still do the air test on the turbo inlet later since I'd love to know if I have any unexpected leaks anywhere. Thanks for the tips
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