ID the component

Yeah it's a air injection thingy, I have one conveniently mounted on top of my coil packs meaning it's a right PITA to change the rear plugs :p
 
Lashout_UK said:
It's the air pump control/check valve for the secondary air injection pump, which feeds fresh air into the exhaust manifold when the engine's cold.

This raises the temperature of the exhaust gas as the additional oxygen burns off with any remaining fuel in the rich exhaust mix, which reduces emissions.

It also causes, or is installed specifically to help, the catalytic convertors to get up to operating temperature faster, further lowering emissions.

That particular valve prevents hot gases flowing back in from the exhaust manifold to the air pump :)

Some catalytic convertors require a supply of fresh air to operate properly too, provided by the same system, although I'm not sure how common they are.
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Thanks! :)

mjt said:
What engine is that?
Click to expand...

It's from a 320 iirc.
 
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