air pump question

Post by **jblackburn** » 05 Apr 2009, 18:05

I think most people just opt to replace it (out of annoyance at the light coming on mainly). My car's eaten 2 and is on its third looking back through its service history. Strangely, that seemed to be the only thing that really ever went wrong with the car. I don't know if that's a good thing or bad

There is a write-up here:
https://www.matthewsvolvosite.com/air_pu ... nt_850.php

That describes using a VW air pump that will save you a lot of money by not using the ridiculously expensive Volvo part.

I haven't seen anything about tricking the car into thinking it's working, maybe others have run across that. But I'm willing to bet that if were to disconnect the air pump and you can get the lower oxygen sensor to hold a constant voltage that would emulate the pump being on, the car would think it was working and run accordingly. I wonder if one of your oxygen sensors/mass air flow is bad in the first place and causing the black smoke; ideally, even with that light on, the engine shouldn't be running so rich anyway that it's blowing raw fuel out the exhaust. I wonder if it's possible that your car really has more stored codes that you're clearing instead of just the air pump?

Post by **misha** » 05 Apr 2009, 18:28

No,all parts are genuine Bosch...Maf,front o2,rear o2.The only thing that's not working is air pump.
You didn't read posts from beginning,i don't have that problem anymore,almost 4 years.But my air pump still doesn't work.Mij said to me that car has probably adapted to work without pump.Only problem i have is that i can't disconnect battery because it resets this "adaption" and goes all around from beginning.
Thanks...

Post by **MadeInJapan** » 05 Apr 2009, 19:36

You're going to have to replace the pump and possibly the SAS Valve and then reset the codes for that if you don't want to go through adaptives again...or read up on faking out the 02 sensor with some wiring, etc...and then reset the codes. I have seen posts about this over on VolvoSpeed but haven't tried it myself.

Edit- just saw this thead: http://volvospeed.com/vs_forum/index.ph ... pic=114234 The guy has a working air pump as well as SAS valve- cheap!

Post by **misha** » 06 Apr 2009, 16:29

Thanks Mij....thanks to all of you guys.
There is plenty of 850 turbos(2.0 and 2.3 engines) for parts,here in Serbia.Most of them are '94-'95.They are came from Italy(they're the most cheapest there than anywhere in Europe).
Does 850,s,v70 turbos have air pump?Are those pumps same as for non-turbos?

Post by **MadeInJapan** » 06 Apr 2009, 16:39

Yes, I believe they're all the same (for those that have them).

Post by **misha** » 06 Apr 2009, 17:07

Ok.Just one more question:
Is there a way to clean sas valve or it needs to be replaced?I'm preety sure that mine is stucked.

Post by **MadeInJapan** » 06 Apr 2009, 18:31

It has a diaphragm in it- it's either good or bad.

Post by **misha** » 07 Apr 2009, 16:20

Well....i think that mine is bad because it lets water(from condensation) in air pump and then to airbox!

I sealed that hose from sas valve a few years ago to stop water to go into pump.
I guess i need that valve too.
Thanks guys!

Post by **holler1** » 07 Apr 2009, 20:09

Misha,
Someone on Volvospeed posted a way to get rid of the SAS system and bypass it electrically so the ECU doesn't know it's gone. Search for "SAS delete" if you want to find it. The poster was "lookforjoe" and it was posted around Dec 2008. I saved the file but lost the link. If you are interested and can't find it I might be able to upload the file, although it has a lot of pictures.

Post by **Ozark Lee** » 07 Apr 2009, 22:09

When you get into the European stuff most of us have no clue - if the part number is the same then it is the same. Poke around on the database and as I recall there is a modification that involves drilling holes in the pump that lets the condensation to drain out and it thus saves the valve and the motor from premature failure.

...Lee