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Author Topic: Hissing noise when I turn my engine off?  (Read 2260 times)

Offline reedy20vturbo

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Hissing noise when I turn my engine off?
« on: 12 May 2014, 17:02 »
Hello,

My 1.8t Aum has developed a hissing noise from down the back of the engine after I switch it off, it's almost like it's dripping something onto the exhaust, it's that kind of sound, has anyone had this problem? It's last for a minute maximum from when I switch it off, thanks
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Offline Dalo Harkin

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Re: Hissing noise when I turn my engine off?
« Reply #1 on: 12 May 2014, 17:34 »
are you sure its coming from there? if it was dripping there would be a gap in the sound every now and then
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Offline james2

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Re: Hissing noise when I turn my engine off?
« Reply #2 on: 12 May 2014, 17:49 »
I had this noise when i got my car. Turned out to be the brake vac servo leaking air. Look by the brake fluid   bottles and there is a plastic pipe that goes into the metal servo. The rubber seal had split.
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Offline reedy20vturbo

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Re: Hissing noise when I turn my engine off?
« Reply #3 on: 12 May 2014, 19:30 »
Yeah I'm pretty sure it's coming from there mate, I've had the brake servo pipe split already mate so that's ruled out, it slowly gets quieter and dissappears, could it be a coolant leak?
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Offline james2

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Re: Hissing noise when I turn my engine off?
« Reply #4 on: 12 May 2014, 20:43 »
Quote from: reedy20vturbo on 12 May 2014, 19:30
Yeah I'm pretty sure it's coming from there mate, I've had the brake servo pipe split already mate so that's ruled out, it slowly gets quieter and dissappears, could it be a coolant leak?
When you turn the car off have the bonnet popped open and check the brake servo pipe ,my moneys on that being your problem.  :wink: it is a rubber seal that holds the plastic pipe in the brake servo. It will look fine but if you move the pipe you will see the gap / split.
« Last Edit: 12 May 2014, 20:48 by james2 »
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AGU 1.8T. Mods done: R32 front bumper, turborev smic, ngk platinum spark plugs, uprated pancake pipe, demon motorsport boost hoses, forge 007 dv, forge engine cover, r-tec stage 1 map ,home made cold airfilter ,run on 98 ron fuel and castrol edge 0w 40 oil. Advanti racing alloys.

Offline rio_gti

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Re: Hissing noise when I turn my engine off?
« Reply #5 on: 12 May 2014, 20:56 »
My old fiesta  :rolleyes: used to do this and it was the servo  :wink:
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Offline reedy20vturbo

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Re: Hissing noise when I turn my engine off?
« Reply #6 on: 12 May 2014, 21:10 »
Ok mate I'll have a look, it seems to be coming from the right side of the engine though?
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Offline reedy20vturbo

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Re: Hissing noise when I turn my engine off?
« Reply #7 on: 14 May 2014, 22:31 »
Right, I got home from the misses house and got the bonnet open before I switched the engine off, for the first 10 seconds there was nothing, then suddenly it starting hissing so I had a good play about with the hoses and found nothing, it really does sound like water hissing, so I slowing undone my coolant cap to release pressure and instantly it stopped, I followed the line from under the coolant bottle and it goes around the back of the engine, I think that could be there problem, am I right in saying it goes to the turbo? It's a metal pipe goes around the left side of engine around the back, cheers
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Offline reedy20vturbo

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Re: Hissing noise when I turn my engine off?
« Reply #8 on: 16 May 2014, 22:24 »
It's the coolant feed pipe to the turbo!
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Offline earlymk2

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Re: Hissing noise when I turn my engine off?
« Reply #9 on: 17 May 2014, 07:38 »
Have you got air con? Air con makes that kinda noise when you turn the car off after it's been running. Totally normal.
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