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Author Topic: Strange wizzing noise from cold start.....  (Read 1471 times)

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Northstar

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Strange wizzing noise from cold start.....
« on: 12 May 2008, 21:14:34 »
Hello all....

My Omega has started to make a very strange noise when its started from cold....

Sounds like a high pitched wizzing noise.... Like the noise you get from a super charger.
After a minute or so it goes off, as if a valve had been closed or summat.....
Its been doing it for a few months now, but seems to be getting louder??
Im guessing its something to do with the choke?? Is it something to worry about??
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Dazzler

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Re: Strange wizzing noise from cold start.....
« Reply #1 on: 12 May 2008, 21:19:07 »
Its normal matey ;)

Just a fan that runs for the first minute or so, does tend to get a little noiey with age.
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Northstar

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Re: Strange wizzing noise from cold start.....
« Reply #2 on: 12 May 2008, 22:29:17 »
Ow cool thanks....

What does it do just out of interest??
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TheBoy

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Re: Strange wizzing noise from cold start.....
« Reply #3 on: 12 May 2008, 22:32:55 »
sia - pumps air into exhaust manifold which ignites with unburnt rich fuel to heat cats quicker
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Northstar

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Re: Strange wizzing noise from cold start.....
« Reply #4 on: 12 May 2008, 23:22:02 »
Thanks for explaining that one... cheers :y
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Darth Loo-knee

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Re: Strange wizzing noise from cold start.....
« Reply #5 on: 12 May 2008, 23:31:59 »
You can unplug it mate.... its under the passengerside wheelarch, infront of the wheel..... :y
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Northstar

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Re: Strange wizzing noise from cold start.....
« Reply #6 on: 13 May 2008, 00:05:41 »
Will that have any effects at all??
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Darth Loo-knee

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Re: Strange wizzing noise from cold start.....
« Reply #7 on: 13 May 2008, 00:09:15 »
only the noise will stop ;D
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Darth Loo-knee

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Re: Strange wizzing noise from cold start.....
« Reply #8 on: 13 May 2008, 00:10:54 »
I have taken off the secondary valve and pipe off too, then blocked the rubber hose ends up...
Not noticed any difference at all :y
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Northstar

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Re: Strange wizzing noise from cold start.....
« Reply #9 on: 13 May 2008, 00:11:21 »
 ::)Nice one.....

Its something to tinker with I guess... lol...

thanks once again.
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bappy

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Re: Strange wizzing noise from cold start.....
« Reply #10 on: 13 May 2008, 19:15:29 »
I noticed this noise on mine.... At risk of sounding like a complete retard....  doesn't deliberately burning fuel in the manifold cause potentially a lot of extra wear on the cats? at £200+ each I dont want my car deliberately wearing out cats for the sake of cleaner emmissions 2 miles sooner....
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Grumpy

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Re: Strange wizzing noise from cold start.....
« Reply #11 on: 13 May 2008, 19:40:41 »
Quote
I noticed this noise on mine.... At risk of sounding like a complete retard....  doesn't deliberately burning fuel in the manifold cause potentially a lot of extra wear on the cats? at £200+ each I dont want my car deliberately wearing out cats for the sake of cleaner emmissions 2 miles sooner....

You are not burning extra fuel. You are burning any excess fuel that
has come through whilst running on a richer, colder mixture during
start up.

The theory is that the Cats get up to temperature quicker. Cats
are efficient when hot, not cold.
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bappy

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Re: Strange wizzing noise from cold start.....
« Reply #12 on: 14 May 2008, 12:42:18 »
true but it's still unburnt petrol being ignited in the manifold isnt it?

My understand of exhaust systems is very limited so I can accept it if im wrong lol
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jasonxr2racer

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Re: Strange wizzing noise from cold start.....
« Reply #13 on: 14 May 2008, 13:30:21 »
Quote
I have taken off the secondary valve and pipe off too, then blocked the rubber hose ends up...
Not noticed any difference at all :y
Solves a problem for me!!!

Is the secondary one behind the rad with 2 vac pipes attached and a sensor with grey plug?
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