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How to test secondary air injection valve?
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2002 4.6is |
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#2
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Which car is this on? At least on the 3.0, pre lci and lci sap systems are different. Early has a vacuum controlled valve while the later ones eliminate this and just use the air pumps pressure to work against the spring and force the valve open. If you can blow through it, it's fine. There's also a mini maf that goes bad and can throw the generic obd code. Inpa or equivalent will tell you.
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2012 xDrive35d 2001 BMW X5 3.0i 5MT and two 1987 Corvettes - Callaway Twin Turbo and Guldstrand Grand Sport 80 Block Tester |
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Quote:
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2002 4.6is Last edited by rwm514; 03-19-2019 at 08:01 PM. |
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Ok, no mini maf on that system. Basically, the air pump operates at startup, and the ecm looks for the added air to affect o2 values. If it doesn't see the change, it throws the code.
The air pump comes on at cold start and should produce a brisk breeze out of the hose if you disconnect it. To test the valve, apply vacuum to the vacuum line and blow through the big hose to the valve. If you can't, the diaphragm is probably holed.
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2012 xDrive35d 2001 BMW X5 3.0i 5MT and two 1987 Corvettes - Callaway Twin Turbo and Guldstrand Grand Sport 80 Block Tester |
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I wasn't able to get air to flow through it, with or without vacuum to the small line. I guess its frozen up inside.
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2002 4.6is |
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