Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: jay99 on 02 August 2014, 09:41:00

Title: auxiliary air pump whine and misfire
Post by: jay99 on 02 August 2014, 09:41:00

Hello, every time I start the car up I get the worst whine imaginable and wakes everyone up with in a one mile distance.

On further reading it seems to be the aux air pump. I have searched and come to the conclusion that it is unessential.

I've seen that I should unplug it, is this safe? Or do I have to remove the whole unit?


One more thing, sometimew when I start the car up from proper cold in the morning I get the most horrendous misfire but disappears when the car is warm and runs perfectly throughout the day. You can't even press the accelerator its like its running on two.

No warning lights and plugs and leads replaced 200 miles ago. Runs perfect every time started up after that and only on some mornings.

Thank you

Title: Re: auxiliary air pump whine and misfire
Post by: Shallow Al on 03 August 2014, 11:31:21

You can remove the fuse to stop the aux air pump running. As said, not really needed.
The mis-fire sounds very much like head gasket failure. Very common on the 4 cylinder..
Just happened on mine too. I spent a while changing leads and plugs, hoping it would go away. It didn't.
I eventually proved the fault was head gasket by chucking a bottle of Rad Weld Plus in it, and it stopped overnight and been great since.
It's temporary repair/bodge until I do the head gasket, and it proved where the fault is.
Going to take a battering as rad weld can be controversial.

Title: Re: auxiliary air pump whine and misfire
Post by: 05omegav6 on 04 August 2014, 17:07:33

Radweld is fine if you don't mind having to replace the heater matrix mid winter when you suddenly realise it no longer works ::)

Using it to solve a head gasket failure is a fools errand :-X

Title: Re: auxiliary air pump whine and misfire
Post by: jay99 on 04 August 2014, 17:29:14

I doubt if its the head gasket, no coolant or oil loss and no Mayo anywhere.
For the aux air pump, which fuse is it?

I haven't got that misfire again for some reason, cars been running perfectly plenty of power and had the oil, oil filter and air filter done today.

Its like sometimes on mornings once in a while it runs like a bag of spanners no timing or anything just horrible but smooths out and runs perfectly for days/weeks after.  :-\

Title: Re: auxiliary air pump whine and misfire
Post by: 4x4 on 04 August 2014, 17:41:05

I would change ht leads,plugs and coil and then see how it goes.