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#275356 - 12th Dec 2008 4:46pm Astra 1.7DTI hissing
AX_125 Online   content

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Registered: 10th Nov 2003
Posts: 3793
Loc: Home
My other half has just phoned me to tell me that her Astra turbo Diesel has developed a hissing noise from the engine that sounds like a leaving tyre.

Apparently there is no loss in performance and no noticable smells.

The engine has recently been rebuilt with new cylinder head and cambelt.

is it a noise we should be worried about?
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#275357 - 12th Dec 2008 4:49pm Re: Astra 1.7DTI hissing [Re: AX_125]
MattLFC Offline
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Registered: 14th Aug 2004
Posts: 22315
Loc: Moreton/Beirut/Mobile
Is it the turbo? Mine hisses a bit, only just noticeable, and I am told this is entirely normal for my engine. Could even be wind noise, that she hasnt noticed until recently because its become very windy?

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#275360 - 12th Dec 2008 4:55pm Re: Astra 1.7DTI hissing [Re: MattLFC]
StuyMac Offline

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Registered: 24th Nov 2003
Posts: 12002
Loc: Wirralshire
Sounds like a boost or intake pipe has come loose..
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#275536 - 13th Dec 2008 10:23am Re: Astra 1.7DTI hissing [Re: StuyMac]
AX_125 Online   content

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Registered: 10th Nov 2003
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I was thinking it might be something like that, nothing to do with wind, as it is doing it when stationary. Not heard it myself yet, will have to have a listen
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#275560 - 13th Dec 2008 1:10pm Re: Astra 1.7DTI hissing [Re: AX_125]
MrPhil Offline
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Registered: 14th Apr 2006
Posts: 2367
Loc: Prenton
check all pipe work for splits, loose connections. also if the car smokes more than normal it will be an air leak.
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#275830 - 14th Dec 2008 1:07pm Re: Astra 1.7DTI hissing [Re: MrPhil]
DavidB Offline
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Registered: 7th Dec 2003
Posts: 5592
Loc: Bebington, Wirral
Does it only do it while the engine is running?
The little switch under the heater/blower controls is operated by vacuum from a pipe that connects to the inlet. It's a pathetic plastic pipe like a drinking straw and I've probably broke about four of these.
Push the switch in and see if you can hear a 'click'. If not, the pipe is either broken or a rubber pipe has come off!

You can start the car and stop it and push the switch in. If it makes a clicking noise from behind the dashboard, it's okay.

Makes me think the mechanic or whoever did the repair has left something unattached or broken this straw pipe.
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#275831 - 14th Dec 2008 1:09pm Re: Astra 1.7DTI hissing [Re: DavidB]
DavidB Offline
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Registered: 7th Dec 2003
Posts: 5592
Loc: Bebington, Wirral
Oh, am not sure if this is the same on diesels, but if a vacuum pipe is leaking, you'd notice with the idle being all over the place! The bigger the leak, the worse the idle gets. smile
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#275931 - 14th Dec 2008 6:40pm Re: Astra 1.7DTI hissing [Re: DavidB]
AX_125 Online   content

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Registered: 10th Nov 2003
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I have found it, one of the pipes that runs from the water bottle to the radiator is split.
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#276067 - 14th Dec 2008 9:32pm Re: Astra 1.7DTI hissing [Re: AX_125]
DavidB Offline
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Registered: 7th Dec 2003
Posts: 5592
Loc: Bebington, Wirral
Good job you found it! Was it water or air?
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#276173 - 15th Dec 2008 8:39am Re: Astra 1.7DTI hissing [Re: DavidB]
AX_125 Online   content

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Registered: 10th Nov 2003
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Water.

Just need to get hold of a hose now.
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#276230 - 15th Dec 2008 4:20pm Re: Astra 1.7DTI hissing [Re: AX_125]
AX_125 Online   content

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Registered: 10th Nov 2003
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Turns out it was a pipe that goes to the water pump, unable to get hold of one, so have cut it, put some copper pipe inside and used jubilee clips to attach it back together.

Seems ok so far.
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