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#1
06-27-2008, 06:26 PM
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2004 GMC Envoy Evap Emission Control Service Port
I have an OBD code P0442 on my Envoy. I replaced the gas cap and reset the code but the service engine soon light came back on after about 30 miles driven. I noticed that there is a what looks like a vacuum port that is located on top of the engine, just in front of the TBI. Is this port supposed to be plugged or capped off? Mine is open. I suspect that this open port is causing my problem. Please help. Thanks
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#2
06-27-2008, 06:50 PM
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Re: 2004 GMC Envoy Evap Emission Control Service Port
Welcome to AF. It is a test port to introduce low pressure into the evap system for test purposes. There may be a cap on it like a tire valve cap, but that is not for sealing purposes. If you cannot see any leaks around various hoses in the system, a smoke machine may be required to track this down.
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