Aston Martin DB7 Vantage V12.

[Annebott]

I have above car and wonder if anyone can advise me re EV 152 Valves. On Internet it says you should only be able to blow air one way but Valves I have allow air to.pass both ways. They are power craft original Valves so wondered if anyone can advise.

[pdbollinger]

These are your PCV Valves and should only blow one way. Check your air filters. You probably have a lot of oil on them from dripping. Also, check your throttle bodies for oil in them as well. This can lead to CEL coming on with misfires, etc. While you are checking these things, stretch your air intake hoses and shine a bright flashlight into the one end to check for holes. All of this can lead to O2 rich issues and trip a CEL as well.

The PCV valves are difficult to remove, but if you take your time, you should be able to change them at home.

Paul