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[gazman]

hi all,new to all this.bought a 98 omega cd 2.o about for weeks ago and am really happy with it.all gadgets and engine work fine.my only problem is when i turn engine off i get a hiss sound under the bonnet.this only lasts about 2 seconds and sounds a bit like a lorrys airbrake.any answers would be apprecitated.

[unlucky mark mv6]

hi all,new to all this.bought a 98 omega cd 2.o about for weeks ago and am really happy with it.all gadgets and engine work fine.my only problem is when i turn engine off i get a hiss sound under the bonnet.this only lasts about 2 seconds and sounds a bit like a lorrys airbrake.any answers would be apprecitated.

Sounds like a vacuum leak mate

[raywilb]

welcome,youv,e joined a great forum mate, just one thing, what model have you. you may have to add it to your profile in order to get the correct advice. my diesel makes a noise when engine stops. 

[Andy B]

Sounds more like self levelling suspension compressor venting to me. The vent is abehind the driver's side head light.

[gazman]

thanks for your replys,had another quick look and still cant find the leak,i can sometimes hear a slight hiss when accelerating but dont hear it when cruising.the car does still pull and run fine.again thanks for replys so far

[Welung666]

Where abouts are you Gaz?

[al brown]

Sounds more like self levelling suspension compressor venting to me. The vent is abehind the driver's side head light.

Doubt it has that on a cd spec, but that was my first thought too. Would suggest air leak of some kind from either the vacuum or the plenum.
Al

[feeutfo]

vac leak, 100%

there is a routing map in maintenance section, pay special attention to large vac pipe from plenum where it rubs on the bulkhead, and any small 3 to 4 mill black plastic plpes that may not be conected.

[feeutfo]

as said, self levelling on Elite only

[Andy B]

as said, self levelling on Elite only

It was a suggestion ......... 

[feeutfo]

as said, self levelling on Elite only

It was a suggestion ......... 

as was mine, just noticed its a 4pot not the v6 i was talking about, arse! But still vac leak surely?

[Andy B]

as said, self levelling on Elite only

It was a suggestion ......... 

as was mine, just noticed its a 4pot not the v6 i was talking about, arse! But still vac leak surely?

Probably! But does a suck make a hiss sound?          

[feeutfo]

as said, self levelling on Elite only

It was a suggestion ......... 

as was mine, just noticed its a 4pot not the v6 i was talking about, arse! But still vac leak surely?

Probably! But does a suck make a hiss sound?          

yes ime, changed plugs leads and dis on another members 2.5, it was running on 4 with no vac, sounded like a scooby, flat as a pan cake with a very audible hiss, busted vac tank and worn through vac pipes in numrous places. It flew when fixed, not that Mr Daisy noticed.

[Andy B]

...
It flew when fixed, not that Mr Daisy noticed.

    

[gazman]

hi all,just a update to my hissing problem,just incase anyone else ever has the same.took into garage,it was gasket in the air inlet manifold.car working nice with no hissing,thanks to all who replyd.