How to Test and Repair your EVAP Valve

EVAP valveThe purge valve is a common failure item on the Volvo 850/x70 series. This is a great how-to with easy-to-follow pictures for a fix to avoid buying a new valve.

I have adapted this from my original tutorial for the BMW M30 engines. They both use Bosch systems and the valve is identical. What happens is that at startup the valve stays open to draw fumes caught in the charcoal canister. The fumes are there because they evaporate from the fuel tank. This is why your gas cap is usually checked at emissions inspections and why the manual says you may have a temporary check engine light when you fill up with the car on. The only place evaporating gas can go is the charcoal canister which is then pulled into the intake at startup.

This is pretty much always the P0455 code.

Read the rest of this fine tutorial w/ photos: How to test and repair your EVAP valve

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Date August 5, 2010

2 responses to “How to Test and Repair your EVAP Valve”

  1. […] EVAP Code: this could be a J-hose, purge valve or gas cap. Sometimes it is tricky to track down and would require a smoke test. […]

  2. jesus says:

    what is the name of the valve next to the gas tank on a Volvo s40 2004


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