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Toyota shows a part number for a valve coming from the valve cover. However, some Celicas just have a "ventilation system" which is just a short tube that comes from the valve cover closest to the EFI (fuel rail next to the firewall) and connects to the EFI. In those vehicles, there is no valve, it just breathes back into the fuel rail. If it did not, the engine would build too much pressure. Everything on these cars is a sealed system, from the pressure cap on the gas tank, to the air management box where the air is controlled by the computer as it comes through the filter. Open up the system with the engine running (like opening the oil filler cap) and you can hear the engine react to the loss of pressure. Cheers...
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