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[sticka_v8_init]

Hiya, as per title really. On start up for about 15 secs I get a noise that i'm pretty sure is the secondary air injection pump. Can anyone advise what this does....or if i even need it  :-/ :-/

Any help much appreciated

[henryd]

Its not needed,just reach up into the wheel arch and disconnect the pump,it's put there to help with emissions when cold

[Andy B]

Has anyone stripped down one of these air pumps & replaced bearings ....... assuming that it's possible to do so. Mine is screaming on start up too .......... just wondering as I've never even seen one 

[tigers_gonads]

DLK disconected mine and removed some of the plumbing last September 

Car runs perfectly well without it 

[Abiton]

Has anyone stripped down one of these air pumps & replaced bearings ....... assuming that it's possible to do so. Mine is screaming on start up too .......... just wondering as I've never even seen one 

Andy, I'm not sure that the noise is bearings.  Ages back I came across this thread on another forum:
http://uk-mkivs.net/forums/t/141240.aspx

As you'll see if you read it, the problem (on what looks to be a very similar if not identical pump to the Omega's) is that the casing rivets fail, leading to a high pressure air leak when it's running.  Fix is to replace rivets with bolts.

I haven't actually tried this, as our pump doesn't make any untoward noises, despite about 177k on the clock.

It would be (gently) interesting to know if anyone with a noisy one on - or off - an Omega shows the same failure.

[Andy B]

Has anyone stripped down one of these air pumps & replaced bearings ....... assuming that it's possible to do so. Mine is screaming on start up too .......... just wondering as I've never even seen one 

Andy, I'm not sure that the noise is bearings.  Ages back I came across this thread on another forum:
http://uk-mkivs.net/forums/t/141240.aspx

As you'll see if you read it, the problem (on what looks to be a very similar if not identical pump to the Omega's) is that the casing rivets fail, leading to a high pressure air leak when it's running.  Fix is to replace rivets with bolts.

I haven't actually tried this, as our pump doesn't make any untoward noises, despite about 177k on the clock.

It would be (gently) interesting to know if anyone with a noisy one on - or off - an Omega shows the same failure.

Thanks for the link, very interesting. It could very well be an air leak rather than bearings. I'll look into it.      

[sticka_v8_init]

Thanks again for all the advice fellas. Have disconnected it and noise gone, doesn't seem to have altered the performance at all. Os it just fitted for ballast 

Thanks again 

[Matchless]

Usually bearing failure on Omegas. I have tried prising them apart without success, The impellers are press fitted onto the shaft and are too fragile to lever off.
I ran without one for a while, seemed to lose a bit of mpg so refitted and saw a definite improvement but this is for short distance commute of 6 miles in winter so I think it is due to going closed loop slightly quicker as a result of cats warming up quicker.

[jiho102]

Was their a thread on here not so long ago on the same subject and someone said just pull fuse 29b out to disable the pump?
          Yes my car makes the same noise on start up and no i still havent pulled the fuse out