Sounds like an Air Leak - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 23 (permalink) Old 04-07-2009, 06:44 PM Thread Starter
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Sounds like an Air Leak

Just installed the AFE Intake. Running with a Spartan 275 and I have been pounding on it. (Love that Turbo Whistle now) But....I think I have blown something.

There is a very audible sound coming from the right hand side above the wheel when at idle. It sounds like an air hose is leaking at about 40PSI A hissing sound that go away when the engine is shut off.

I have inspected the boots and they look OK and there is no degradation on power still lots of boost and acceleration but this HISSING has to go.


Any suggestions where to start looking

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post #2 of 23 (permalink) Old 04-07-2009, 07:54 PM
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Did you check your clamps? You might want to invest in a set of boot from DieselSite with new heavy duty clamps...

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post #3 of 23 (permalink) Old 04-07-2009, 07:58 PM Thread Starter
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I have the boots from Dieselsite but do not have then installed yet. My current ones are fine and all clamps are tight?

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post #4 of 23 (permalink) Old 04-07-2009, 08:41 PM
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Losen the clamps and see if you can give them a bit of a turn. I had one that leaked a little under hard loads and there was a small pinch in the hose in between the hose and the pipe.

Lets just say not quite stock.
Slower than some. Faster than most.
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post #5 of 23 (permalink) Old 04-08-2009, 01:23 AM Thread Starter
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When the VGT kicks in and out the Hissing starts and stops. I am starting tom think Exhaust Leak????.

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post #6 of 23 (permalink) Old 04-08-2009, 02:41 AM
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Get some super soapy water and spray it over the turbo conection when the truck is still cold. The bubbles will show you the leak.

Lets just say not quite stock.
Slower than some. Faster than most.
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post #7 of 23 (permalink) Old 04-08-2009, 02:57 AM
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let us know what you find. Hopefully its nothing major

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post #8 of 23 (permalink) Old 04-08-2009, 11:21 AM Thread Starter
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Great suggestion with the soappy water, Will do that Friday, and will let you kow

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post #9 of 23 (permalink) Old 04-10-2009, 01:52 PM Thread Starter
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No Luck

Well I soaped it down and saw nothing do I hosed it down and still can't find the leak. Even took a stethoscope and poked around but all I hear is the clatter of diesel. It would seem to be coming from the back of the turbos by the firewall. When the VGT's change so does the hiss??? Which turbo has the VGT's the first smaller one only correct? There is a definite performance drop as on the way home last night had a chance to do some long WOT's and it is much slower. HELP!:

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post #10 of 23 (permalink) Old 04-10-2009, 02:29 PM
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small turbo is fixed. Large turbo is a VGT

Lets just say not quite stock.
Slower than some. Faster than most.
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