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TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

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Old August 28th, 2007, 16:13   #1
dfusconi
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Cool Hissing Sound

i AM EXPEIRENCING A HISSING NOISE AFTER APPLIYING FULLTHROTTLE AFTER 3 SECONDS ESPECIALY UP HILLS UNDER LOAD. SOUNDS LIKE AIR BEING LET OUT OF A TIRE.
2003 JETTA TDI 1.9 TURBO.
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Old August 28th, 2007, 16:30   #2
Wook660
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Normal turbo noise?
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Old August 28th, 2007, 16:36   #3
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I guess that the turbochargers can be heard, but I've never heard mine. Start by inspecting your air path from the turbocharger to the intake manifold for splits. A leaky place would probably be oily too.
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Last edited by KS97Passat; August 28th, 2007 at 16:44.
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Old August 28th, 2007, 16:38   #4
Nico3d3
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Quote:
i AM EXPEIRENCING A HISSING NOISE AFTER APPLIYING FULLTHROTTLE AFTER 3 SECONDS ESPECIALY UP HILLS UNDER LOAD. SOUNDS LIKE AIR BEING LET OUT OF A TIRE.
2003 JETTA TDI 1.9 TURBO.
Are you a new owner of a TDI? Cause, as Wook660 said what you described seem to be the normal noise of the turbo. When you give load to the engine, the turbo adjust itself to give more boost pressure and that's why you hear the hissing noise of air being compressed and blowned into the intake.
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Old August 28th, 2007, 16:47   #5
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Quote:
Originally Posted by dfusconi
i AM EXPEIRENCING A HISSING NOISE AFTER APPLIYING FULLTHROTTLE AFTER 3 SECONDS ESPECIALY UP HILLS UNDER LOAD. SOUNDS LIKE AIR BEING LET OUT OF A TIRE.
2003 JETTA TDI 1.9 TURBO.
Check carefully for any place air can leak out 'downstream' of the turbo compressor. If band clamps were ever not properly installed, air can leak there or through any cracks in the plastic "plumbing". The fact that your car continues to run with power (it does, doesn't it?) and not go into 'limp home' mode indicates a leak and not a popped off hose.
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Old August 28th, 2007, 16:52   #6
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Bump.

Last edited by larithmos; April 22nd, 2009 at 20:37.
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Old August 28th, 2007, 16:52   #7
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Normally I cannot hear the turbo whine until my window is open and I'm passing an object that will reflect the sound into the car... but I always smile when I hear it.
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Old August 28th, 2007, 16:59   #8
KS97Passat
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Quote:
Normally I cannot hear the turbo whine until my window is open and I'm passing an object that will reflect the sound into the car... but I always smile when I hear it.
Yeah! I haven't had the satisfaction of that, but maybe I haven't had the right conditions with the window down. I can hear my Dodge's (Cummins) easily, but the TDI is pretty quiet.

Back to the topic at hand. What is the history of this car? Is this noise something new?
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Old August 28th, 2007, 17:03   #9
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pluged cat??
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Old August 28th, 2007, 17:09   #10
KS97Passat
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Well, we're having a conversation here, but not with the owner of the patient! Maybe he'll check in soon.
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Old August 28th, 2007, 18:18   #11
dfusconi
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Default Hissing Sound

This is the fifth year owning my 2003 TDI. After having my timing belt replaced....I have noticed the HISSING sound
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Old August 28th, 2007, 18:32   #12
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Ahh, the plot thickens. So the belt was just replaced, some of the plumbing has been removed and reinstalled. As stated in the above replies, check the entire air flow for loose ends.
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Old August 28th, 2007, 18:32   #13
dfusconi
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94000 mls. 2003 jetta tdi
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Old August 28th, 2007, 18:35   #14
KS97Passat
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I don't think that a properly done timing belt job could explain the noise, but maybe something wasn't put back correctly or was damaged in the process and now you have a leak.
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Last edited by KS97Passat; August 28th, 2007 at 18:37.
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Old August 28th, 2007, 18:45   #15
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Clamp at intercooler or turbo not correct. Check for oily residue in the area.
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