theholycow
Go Kart Champion
- Location
- Glocester, RI
- Car(s)
- 1980 Buick LeSabre
My Rabbit was throwing a P0420 and I brought it in for service. They replaced the "Insert Valve". What is that?
Dealer said:The inlet valve is a electronic check valve for the secondary air system.
It will open when the secondary air pump is blowing air into the cylinder head to assist in igniting unburned fuel.
It will close when the secondary air pump is off. When closed it prevents exhaust gasses/fumes from blowing back into the secondary air system.