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Old 01-25-2010, 09:20 PM   #1
MLue1
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Lightbulb Secondary Air Pump Rebuild

I found this Secondary Air Pump (SAP) Rebuild How-To, with the high cost of the SAP in Can$ it is an option for someone who has the tools and motivations to tackle the job.
http://forums.bimmerforums.com/forum....php?t=1320200
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Old 01-25-2010, 09:43 PM   #2
Max_VQ
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Nice post.... BUT I don't think most people have the special puller to remove the fan.
When my secondary air pump failed, I took it apart with a saw. Even with that, it was not easy...

If you try this, I wish you luck!!
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Old 01-25-2010, 11:19 PM   #3
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Originally Posted by Max_VQ View Post
Nice post.... BUT I don't think most people have the special puller to remove the fan.
When my secondary air pump failed, I took it apart with a saw. Even with that, it was not easy...

If you try this, I wish you luck!!
Mine is toast so some day when I get around to it I'll let you know.

If someone does try it and is successfull, he could make a few $ helping others out, the last I checked the best price for one of these SAP was $375.
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Last edited by MLue1; 01-25-2010 at 11:26 PM. Reason: comment
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Old 01-25-2010, 11:46 PM   #4
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Originally Posted by MLue1 View Post
Mine is toast so some day when I get around to it I'll let you know.

If someone does try it and is successfull, he could make a few $ helping others out, the last I checked the best price for one of these SAP was $375.
Hey Mark,

What are your symptoms with the pump being out or service? Any effect on the performance and fuel consumption?
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Old 01-25-2010, 11:52 PM   #5
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I think i should have a few of them for sale...lol
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Old 01-26-2010, 12:26 AM   #6
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Originally Posted by Dado 540 View Post
Hey Mark,

What are your symptoms with the pump being out or service? Any effect on the performance and fuel consumption?
Hey Dado, the SAP is only used the first minute of start up,... I removed mine 2 years ago and put a big cork to cap off the hose I haven't noticed any difference in drivability, fuel consumption for my car in combined hiway and city driving, is usually over 450 km on 55 litres (with 315 read end), but a bit less in the winter depending on how many cold starts I do. The car passed with flying colors back in December, lots of zeros, I was surprised that they didn't even check for the SAP but then again how would they test it, the car was already warmed up.
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Last edited by MLue1; 01-26-2010 at 12:45 AM. Reason: info
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Old 01-26-2010, 10:28 AM   #7
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Hey Mark, honestly, there isn't much point to change the secondary air pump, mine had thrown code regarding the secondary air pump for the first time back in like 06, I took it in, change the hose as it was cracked.

went away.

months on, came back again, so we thought it's the hose again, changed it, went away.

couple weeks later, came back on, this time everything seems to be fine, then I got irritated driving around with a CEL, feels like I'm driving a VW again.

so change the whole pump.

couple weeks later, came back again.

turns out to be carbon build up, that clogs the air passage, which at the point I decide to leave it, cause the only option I've got is take the heads off and clean it.

til this date, the pump still tries its best every morning and I still get about 600km per tank on the hwy.
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Old 01-26-2010, 11:56 AM   #8
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Ya I don't intend to fix it for my sake but I'm think of selling her and the SAP is the only thing that's out of spec. If the fix is reasonable I will do it as well as change the valve so it can pass the safety.

All hiway driving, I get over 550 km on 55 litres, I never let the needle go below 15 on the gas gage. The Tourings have the 315 rear end so the milage is a bit less.
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Old 01-26-2010, 12:07 PM   #9
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What about check engine light? Do O2 sensor codes come up?
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Old 01-26-2010, 12:12 PM   #10
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Quote:
Originally Posted by MLue1 View Post
Ya I don't intend to fix it for my sake but I'm think of selling her and the SAP is the only thing that's out of spec. If the fix is reasonable I will do it as well as change the valve so it can pass the safety.

All hiway driving, I get over 550 km on 55 litres, I never let the needle go below 15 on the gas gage. The Tourings have the 315 rear end so the milage is a bit less.
you might want to watch out for the code coming up after you fixing it due to carbon build up, unfortunately a lot of 99 M62TU got the codes.

Dado, the O2 sensor won't throw codes since the secondary air pump's job is only to pump air for the first 30-90 seconds from cold start, the code is only directed at the pump itself.
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Old 01-26-2010, 01:24 PM   #11
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Originally Posted by Dado 540 View Post
What about check engine light? Do O2 sensor codes come up?
Ya I get the CEL for the SAP, the O2 sensors monitor SAP, the fuel mixture and the CATs. Both my CATS are fine.
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Last edited by MLue1; 01-26-2010 at 01:26 PM. Reason: correction
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Old 01-26-2010, 01:33 PM   #12
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Quote:
Originally Posted by MLue1 View Post
Ya I get the CEL for the SAP, the O2 sensors monitor SAP, the fuel mixture and the CATs. Both my CATS are fine.
wut.................... I've only gotten SAP code, not the other ones.
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Old 01-26-2010, 01:54 PM   #13
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Originally Posted by TheMadChigga View Post
wut.................... I've only gotten SAP code, not the other ones.
Your O2 sensors are fine, all i'm saying is that the O2 sensors monitor if the SAP is workin or not, The preCAt O2s monitor the mixture the post CAT O2s monitor the CAT.

Quote:
Originally Posted by TheMadChigga View Post
you might want to watch out for the code coming up after you fixing it due to carbon build up, unfortunately a lot of 99 M62TU got the codes.
How can you tell if the head is carboned up before hand?

If it is carboned up then you'd be right about not fixn the SAP.
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Last edited by MLue1; 01-26-2010 at 02:21 PM.
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Old 01-26-2010, 07:35 PM   #14
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Nice find, I got one laying around will try this soon!
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Old 01-26-2010, 08:30 PM   #15
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Quote:
Originally Posted by MLue1 View Post
Your O2 sensors are fine, all i'm saying is that the O2 sensors monitor if the SAP is workin or not, The preCAt O2s monitor the mixture the post CAT O2s monitor the CAT.

How can you tell if the head is carboned up before hand?

If it is carboned up then you'd be right about not fixn the SAP.
I'm not too sure, but I *THINK* that you can do so by running vaccum check through the air passage.
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