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How to test secondary air injection valve?

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03-19-2019, 07:26 PM

rwm514

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How to test secondary air injection valve?

Hi guys, I've been sporadically getting P0491 on cold starts so I removed the air pump, valve and all the hoses to see if I could find the problem. The hoses all looked good and I was able to supply current to the air pump which seemed to be working well. The only part I wasn't sure how to test was the egr valve. It didn't really seem to react to vacuum on the small line. I sprayed a bunch of brake cleaner in it and it seemed pretty dirty. I'm thinking I may need to replace it. Any tips? Thx

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