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2.7 LCE header...hissing noise.

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Old 08-29-2011, 07:26 PM   #1
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2.7 LCE header...hissing noise.

Whats up fellas?

I recently installed an LCE header on my truck and since finishing it I have noticed a subtle hissing noise coming from the header location while driving.

It happens under load only, like under acceleration or revving it in neutral. No hissing at idle. Its a lot easier to hear when the door and windows are closed. When your outside the truck its nearly impossible to pinpoint. I tried having a buddy plug the exhaust with a rag to make the possible leak louder to pinpoint it but that doesn't work.

I replaced the EGR gasket b/c the one that LCE provided seemed a bit cheezy so I replaced it with a felpro gasket. It didn't help....

Any ideas? Is the hissing normal with an LCE header? I had a cracked manifold before installing the LCE header so I know that a usual exhaust leak the far upstream in the exhaust is more like a tick not a hiss....so I am stumped....

ideas?
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Old 08-31-2011, 07:47 AM   #2
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bump...anyone?
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Old 08-31-2011, 10:37 AM   #3
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Try torquing your header bolts down in the right pattern.


then check the flange connection at end to your O2 sensor/cat...tighten it up.


Might came loose if you didn't torque to proper specs.
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Old 08-31-2011, 11:41 AM   #4
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hmmm...i re-torqued everything already, but didn't know there was a specific pattern to tighten the header nuts. I tightened the down by alternating to the right and left side and alternating top and bottom. Whats the specific pattern?
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Old 09-07-2011, 08:29 PM   #5
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bump....anyone else?

I think I am going to order a gasket set from LCE just in case I pinched the header gasket...idk where else the leak/noise could be coming from...
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Old 09-07-2011, 09:40 PM   #6
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Quote:
Originally Posted by TacoMX View Post
Whats up fellas?

I recently installed an LCE header on my truck and since finishing it I have noticed a subtle hissing noise coming from the header location while driving.

It happens under load only, like under acceleration or revving it in neutral. No hissing at idle. Its a lot easier to hear when the door and windows are closed. When your outside the truck its nearly impossible to pinpoint. I tried having a buddy plug the exhaust with a rag to make the possible leak louder to pinpoint it but that doesn't work.

I replaced the EGR gasket b/c the one that LCE provided seemed a bit cheezy so I replaced it with a felpro gasket. It didn't help....

Any ideas? Is the hissing normal with an LCE header? I had a cracked manifold before installing the LCE header so I know that a usual exhaust leak the far upstream in the exhaust is more like a tick not a hiss....so I am stumped....

ideas?
I would think that if it was an exhaust leak you would hear it at idle too...

You descibe the noise as a hiss, can you be more specific or maybe make a recording and post it?

I am wondering if is simply the normal sound of headers. The sound coming through the header tubing is a lot different that what you hear from a regular, cast iron manifold.
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Old 09-08-2011, 06:56 AM   #7
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I will try to get a sound clip/video of the outside/inside. I just noticed yesterday that at idle there is a slight tick coming from the header side....but I never got to hear the motor w/o a cracked manifold so I dont know if its just the valve train or what....I might also get another can of seafoam and run it through the truck to pinpoint the leak too...
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