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Secondary Air Injection Pump Woes - Klaus, help? 850

posted by  PBH on  Thu Oct 29 10:50 CST 2009
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last visit: Mon Jan 2 20:34 CST 2012
[RELATED]

I removed my air pump on my '97 850 a few weeks ago and as expected it was full of water. The relay down below was completely destroyed also. More fun.

I removed the vacuum operated shutoff valve. I found that the valve is still functional. So I now have a few questions:

1. The pump relay appears to be just a simple DC relay, not a cheap relay, but simple. It looks like when the ECU grounds the coil, the pump runs. So I don't see why I need to buy the expensive Volvo relay. Correct? I can just wire in a cheap Bosch SPDT 12 VDC relay?

2. Should the valve have vacuum on it all the time, or is the vacuum applied when the air injection pump is running? I need to trouble shoot the valve, because when I had it off the car it appeared to work properly. I think vacuum is applied to opens the valve, allowing the pump to inject air, but maybe I have this logic reversed?

Any help would be appreciated. I need to pass emissions test soon....

PH





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