Noisy secondary air pump

[GmGuy]

Is there any fix for this? When I start up my 2000 528i, the secondary air pump whistles loud until it shuts off after about a minute or so. It's every time the air pump kicks on.

[geargrinder]

Have you checked to see that the plastic hoses aren't cracked or disconnected? That's usually what makes it louder.

[adwebinc]

Have you checked to see that the plastic hoses aren't cracked or disconnected? That's usually what makes it louder.

And if you have never replaced them, they are likely toast.


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[JimLev]

You can take the motor end of the pump apart to expose at least one of the bearings.
If your lucky a few drops of oil may help.....maybe.
Make sure your secondary air valve isn't all gunked up carbon and not fully closing, that kills the SAP.

[jclausen]

Also sometimes the rivets that hold the main pieces together get loose, them drill them out and replace with screws

[XAlt]

I love my noisy SAP.

It's probably worn bearings in your case.

[pleiades]

I almost never hear mine. Possibly due to the age of my ears but isn't this thing activated below a certain outdoor temp? I half-assumed it wouldn't even come on during summer weather. The few times I have heard it, it sounded like a crazed vacuum cleaner but that was in wintertime. Coincidence?

[XAlt]

I almost never hear mine. Possibly due to the age of my ears but isn't this thing activated below a certain outdoor temp? I half-assumed it wouldn't even come on during summer weather. The few times I have heard it, it sounded like a crazed vacuum cleaner but that was in wintertime. Coincidence?

I hear mine every cold start, it's even louder in the winter.


EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE EEEEEEEEEEEEEEEEEEEEEOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU

[GmGuy]

Wow! Thanks for all the replies guys! I'll check the hose first. Hopefully thats the problem, if not I'll see how it looks inside.

[ViolinARC]

I hear mine every cold start, it's even louder in the winter.


EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE EEEEEEEEEEEEEEEEEEEEEOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU

[geargrinder]

If you hear a lot of noise then something isn't 100%. On my E39 everything works fine and it's difficult to notice. On the E46 it's a bit different and louder I think just because the motor isn't as hidden away deep in the fender, but thats a difft story.

[djb2]

The air pump on my 2002 e39 with 240K miles is nearly silent.

The air pump on my 1999 Z3 has been loud and sometime screechy since new.