Exhaust leak?
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Senior User
Joined: Nov 2000
Posts: 243
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From: Calgary
Exhaust leak?
Just replaced heads and lifters and I have a noise under my hood. When idling it is barely noticable, but gets pretty loud under acceleration. If I just rev the engine up is gets a little louder but not much, when the engine is under load it gets much louder. As soon as I let the foot of the gas and it idles down, the noise almost totally goes away. It does sound like an exhaust leak but havent tracked anything down yet. Would an exhaust leak get louder under load?
Also, if I put my hand over the tailpipe to stop the exhaust I can hear it leaking out somewhere else. It should be coming out of the leak, or will the exhaust be relieved somewhere else (through the valve seals?) And is this practice a bad idea?
I'm not quite sure how to distinguish between a mechanical noise and and exhaust noise. I put a stethescope on the valve cover and head and it all sounds ok.
Just wondering what your thoughts might be.
Thanks
Jason
Also, if I put my hand over the tailpipe to stop the exhaust I can hear it leaking out somewhere else. It should be coming out of the leak, or will the exhaust be relieved somewhere else (through the valve seals?) And is this practice a bad idea?
I'm not quite sure how to distinguish between a mechanical noise and and exhaust noise. I put a stethescope on the valve cover and head and it all sounds ok.
Just wondering what your thoughts might be.
Thanks
Jason
Posting Guru
Joined: Nov 2003
Posts: 1,071
Likes: 1
From: Concord, New Hampshire
Sounds like you have a leak on your manifolds somewhere, weather it be on the head to manifold seal or manifold to engine pipe seal bit its defidentley on or by the manifolds, it fits the discription, or maby a cracked manifold, that also has the same cherictoristics. and when the trucks running just pass your hand by the manifolds, iff its leaking youll feel the air rudshing by.
