If you see in this diagram for a 2004 gmc envoy 6 cyl. There is no compression on valve item #12 in the following link. Is this the fuel rail valve that I need to check psi from? I checked the valve that is by the fuel filter for the fuel pump and there is enough compression there. So question is, is item #12 the fuel rail valve I need to be checking?
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coils- good ohms reading there
replaced coil boots
replaced spark plugs
cleaned out throtle body
before I check the fuel injectors I would like to know if item 12 is the fuel rail valve. Please advice, thank you! All the information found in your website is awesome!