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N62 - Secondary air pump filter exchange

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1.5K views 3 replies 3 participants last post by  Annolago  
A
#1 ·
Hi
So forgive me but actually don’t know if all engine models are equipped with a secondary air pump - but the V8’s are and they run for the first 90 seconds or so to help lower the emissions while the engine is cold. On that air pump there is a filter, just like on the regular intake - except it is much smaller. Now Iam starting to get a rough idle in those first 90 seconds so it dawned on me that maybe it would be a good idea to replace it. Searched everywhere including NewTis and all other places I could find but nowhere is it stated that you should replace that filter. Now it only runs for 90 seconds but my car is getting old and if I say my average distance driven is around 8 kilometers then it mounts up to about 300 hours and I think that is set very low as there are many short runs.
so have anyone ever replaced such a filter? Or have an opinion about it?
Thx
PS, yes I am changing the pcv valves and switching to the never isolated hoses as soon as the temperature is above freezing. Hate not having a garage... :-(
 
L
#2 ·
Hi Annolago,
Searched through RealOEM and a local BMW supplier Leebmann24. Can't find any reference to an air filter for the secondary air pump. Perhaps it's like the power steering reservoir, it's built in and can only be changed by changing the pump. Sounds logical but what about a vacuum leak? That Y air pipe that runs under the intake manifold is thin and brittle. Have you checked the air pipes? What about the carbon build up in the secondary air system? Does anyone know if this affects idle at start up? I know it will cause a failure on emissions testing. I bought and used the secondary air service kit from AGA. It cleared up the error codes but it's been 3 or 4 years now and I think it's about due again. I'm like you, most of my drives are short inner-city trips with the occasional long weekend get away drive (non-existent since the Covid). Just rolled over 200 kilometers, I don't drive it any where near hard but I don't baby it either especially since my suspension service / upgrade. I love it, wasn't sure how it would turn out when I was planning it but I'm certainly happy with the result.

Cheers
 
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C
#3 ·
AFAIK only the 545 has the sec air pump in North America.
I have had cold starting issues like you describe for as long as I have owned my 545 (9 yrs), and managed to reduce/eliminate it entirely by switching engine oil in winter 10w60 eliminates it totally and am currently running 5w40 again and only had one occurrence this season so far.
 
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