1998 V70 Does the Air Pump Actually Do Anything?

Post by **erikv11** » 21 Mar 2014, 07:47

If any air pump enthusiasts want to buy my old (working) one, let me know. I'd love to sell it cheap and get it out of my garage. I actually have a few 850 pumps plus one 98 x70 pump, all working just fine.

instarx · Post by **instarx** » 21 Mar 2014, 12:47

I think if myself as a clean-air enthusiast.

Post by **erikv11** » 21 Mar 2014, 13:15

??

Well then, for all those model years where some cars shipped with air pumps and some without, probably an equal number shipped without - don't get tricked into buying one of those high-polluting SAS-less cars! Or any of the newer models, where the air pump has been completely eliminated.

I'm not making a jab at anyone about the air pumps, I truly have several and would be quite happy for them to go to someone who wants them. I thought the market had completely disappeared.

Post by **jblackburn** » 21 Mar 2014, 13:25

Or any of the newer models, where the air pump has been completely eliminated.

The addition of VVT on the later models helped eliminate the need for the secondary air injection system. It changes valve overlap at opportune times to speed warming of the catalytic converter.

Post by **polskamafia mjl** » 18 Jun 2014, 22:44

instarx wrote:I think if myself as a clean-air enthusiast.

You're not alone, my friend.

Post by **xHeart** » 19 Jun 2014, 07:48

The discussion suggests air pump is necessary in snow country.
Which oxygen sensor determines air pump run or not run at cold start?

Post by **jblackburn** » 19 Jun 2014, 07:51

xHeart wrote:The discussion suggests air pump is necessary in snow country.
Which oxygen sensor determines air pump run or not run at cold start?

Front.

Post by **cn90** » 19 Jun 2014, 09:14

Hey jblackburn,

Learned something new.

1998 S70 GLT has air pump, but now has SAS delete mod using 90-cent Radio Shack diode.

I just got a 2005 XC90 2.5T, the newer model of 5-cylinder engines: no air pump as far as I can tell. Maybe I am wrong?

Post by **jblackburn** » 19 Jun 2014, 09:21

cn90 wrote:Hey jblackburn,

Learned something new.

1998 S70 GLT has air pump, but now has SAS delete mod using 90-cent Radio Shack diode.

I just got a 2005 XC90 2.5T, the newer model of 5-cylinder engines: no air pump as far as I can tell. Maybe I am wrong?

1999+ do not have an air pump.

The new engine management systems are able to adjust valve timing at startup to help warm up the catalyst more quickly, eliminating the need for both EGR and the SAS pump.

I don't know if that one has 2 catalysts or not, but that is even more common now - a small one right by the exhaust manifold to get it quickly warmed up, and then another downstream.

Post by **erikv11** » 19 Jun 2014, 09:23

Check this very thread, it is mentioned a few posts up: Air pumps were only installed by Volvo for a few years. Later years used timing to address some of the same emissions principles.

An air pump is not necessary in snow country.

1998 V70 Does the Air Pump Actually Do Anything?

Re: 1998 V70 Does the Air Pump Actually Do Anything?