1998 Omega 2.0 CD Manual. On startup first thing in morning get a screeching 
noise from front nearside, sounds like a fast revving electric motor with 
dry bearings.The noise disappears abruptly after 1 or 2 minutes (you can 
hear it from inside the cabin!). I'm positive its not the cambelt 
tensioners, replaced 2000 miles ago. On restarting engine from warm there is 
no noise, only happens after car has fully cooled down and restarted.  What 
is this motor - some kind of start up pump?. If it fails can I do without 
it?

Dave

"Quiche Mash 'n' Mushy"  wrote in message
news:42b99155$0$41928$ed2619ec@ptn-nntp-reader03.plus.net...

> 1998 Omega 2.0 CD Manual. On startup first thing in morning get a
screeching
> noise from front nearside, sounds like a fast revving electric motor with
> dry bearings.The noise disappears abruptly after 1 or 2 minutes (you can
> hear it from inside the cabin!). I'm positive its not the cambelt
> tensioners, replaced 2000 miles ago. On restarting engine from warm there
is
> no noise, only happens after car has fully cooled down and restarted.
What
> is this motor - some kind of start up pump?. If it fails can I do without
> it?



This is the secondary air injection pump, common on all Vectra's / Omega's
of this era. They have a habit of filling with water which causes the
bearings to dry up / wear out.

If the pump seizes or cannot work for whatever reason it will put the MIL
lamp on the dash, signalling a fault.

Tim..

"Tim.."  wrote in message 
news:d9c4pe$cn3$1@nwrdmz03.dmz.ncs.ea.ibs-infra.bt.com...

>
> "Quiche Mash 'n' Mushy"  wrote in message
> news:42b99155$0$41928$ed2619ec@ptn-nntp-reader03.plus.net...
>> 1998 Omega 2.0 CD Manual. On startup first thing in morning get a
> screeching
>> noise from front nearside, sounds like a fast revving electric motor with
>> dry bearings.The noise disappears abruptly after 1 or 2 minutes (you can
>> hear it from inside the cabin!). I'm positive its not the cambelt
>> tensioners, replaced 2000 miles ago. On restarting engine from warm there
> is
>> no noise, only happens after car has fully cooled down and restarted.
> What
>> is this motor - some kind of start up pump?. If it fails can I do without
>> it?
>
>
> This is the secondary air injection pump, common on all Vectra's / Omega's
> of this era. They have a habit of filling with water which causes the
> bearings to dry up / wear out.
>
> If the pump seizes or cannot work for whatever reason it will put the MIL
> lamp on the dash, signalling a fault.
>
> Tim..
>


 Thanks for that ... is the car still driveable if the pump fails?

"Quiche Mash 'n' Mushy"  wrote in message 
news:42b99ddb$0$2029$ed2e19e4@ptn-nntp-reader04.plus.net...

>
> "Tim.."  wrote in message 
> news:d9c4pe$cn3$1@nwrdmz03.dmz.ncs.ea.ibs-infra.bt.com...
>>
>> "Quiche Mash 'n' Mushy"  wrote in message
>> news:42b99155$0$41928$ed2619ec@ptn-nntp-reader03.plus.net...
>>> 1998 Omega 2.0 CD Manual. On startup first thing in morning get a
>> screeching
>>> noise from front nearside, sounds like a fast revving electric motor 
>>> with
>>> dry bearings.The noise disappears abruptly after 1 or 2 minutes (you can
>>> hear it from inside the cabin!). I'm positive its not the cambelt
>>> tensioners, replaced 2000 miles ago. On restarting engine from warm 
>>> there
>> is
>>> no noise, only happens after car has fully cooled down and restarted.
>> What
>>> is this motor - some kind of start up pump?. If it fails can I do 
>>> without
>>> it?
>>
>>
>> This is the secondary air injection pump, common on all Vectra's / 
>> Omega's
>> of this era. They have a habit of filling with water which causes the
>> bearings to dry up / wear out.
>>
>> If the pump seizes or cannot work for whatever reason it will put the MIL
>> lamp on the dash, signalling a fault.
>>
>> Tim..
>>
>
> Thanks for that ... is the car still driveable if the pump fails?



Aha - a quick Google and I have answered my own question.

Useful info here if anyone else interested.

http://www.12v.org/engine/index.php?section=hw&sm=2nd

Thanks again

Dave