Can any one help with this ?

Asked by GuruGXYHK Aug 19, 2020 at 04:23 PM about the 2004 Chevrolet Silverado 1500 Z71 4WD

Question type: Maintenance & Repair

Tighten oem gas cap. Light went off . 2weeks later
same thing. This is the second one since I bought  
truck new. Ran very rough.  Had it checked  said
miss fire and oxygen sensor. Tighten cap in
parking lot ran perfect. HELP.
.

2 Answers
660

exCompaqr answered 4 years ago

I had a similar experience. It turned out to be the gas tank vent valve which is usually mounted on the frame below the gas cap. It goes through a cycle every time you start the truck checking for a gas cap vent leak. If it malfunctions you'll get a check engine light and an error message from the OBDII port. I changed mine and the problem has never re- occurred. It is cheap too! I've heard that it gets degraded by people who fill their gas tanks beyond the first "click" of "full" at the gas station.

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