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Hissing - Air Leak sound on acceleration

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Old 01-27-2010, 05:51 PM
joejacobi joejacobi is offline
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Hissing - Air Leak sound on acceleration

Over the past few weeks I've noticed a hissing sound on acceleration? sounds like an air line leaking coming from the engine, can hear it with windows down and up. However, it doesn't happen all the time?? oddly very speratic? almost seems like there's a little loss of power as well, not really that noticeable though. Checked underneath the hood, didn't see anything wrong - unfortunately it happens only during acceleration when driving.
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Old 01-27-2010, 06:13 PM
onelionhunter onelionhunter is offline
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Weather

Where are you located, cold weather area? What has the temps been lately?
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Old 01-27-2010, 06:16 PM
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I was going to suggest you check all your I/C boots. But you mentioned that you checked everything under the hood. Have you done a aftermarket in-take? If so it could be surge your hearing from the turbo? Hopefully someone comes along thats more intellengent then me who could help you out bud. Good luck!!!
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Old 01-27-2010, 06:19 PM
onelionhunter onelionhunter is offline
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EBPV

I am thinking it is the exhaust back preasure valve he is hearing, why I asked if it is cold there, it makes a serious racket. Might be the tube is rusted through as well.
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Old 01-27-2010, 06:20 PM
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Probably a boost leak... Try tightening the boot clamps.
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Old 01-29-2010, 09:19 AM
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Defiantly thinking EBPV valve. My truck gets like that when its really cold out. Usually stops after a few miles and its warmed up. Does is stop when you hit the throttle hard?
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Old 11-09-2011, 01:24 PM
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Bringing this back from the dead. I have heard this recently in my truck, it is cold out now, and it only happens when it is cold. Once the truck is fully warmed up, I don't hear the hissing sound. If I step on the throttle hard, it also doesn't make the noise. Any suggestions?
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Old 11-09-2011, 03:24 PM
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ok, I've done some more research and it appears that this is caused by the EBPV. Now the question I have: should it do this while driving (it is a loud noise, and happened after 10 minutes of driving), ie is it normal?

And if it shouldn't happen, should I just disconnect at the valve and not worry about it?

It doesn't seem normal to me, because it is loud when driving (at cruise).
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