We have a 2005 GMC Sierra 1/2 ton truck that has a check engine light on. The dealer checked the code and he told us we need a new Evap Vent Valve and clamp. The cost is over 500.00 with labor being most of the cost. Is this diffcult to change out? Im a very mechanical person. Also he said it would be ok to drive for now but could cause problems down the road. ????like what?My wife is getting ready to take a trip in it, should it be ok for awhile? Dont have 500+ to spend on it now.
How Does Evap System Work
This Site Might Help You. RE: Evap vent valve? We have a 2005 GMC Sierra 1/2 ton truck that has a check engine light on. The dealer checked the code and he told us we need a new Evap Vent Valve and clamp. The cost is over 500.00 with labor being most of the cost. Is this diffcult to change out? Im a very mechanical person. Also he said it would...
Theres 2 valves . 1 is electronic , the other is a manual valve in the canister. The valve is normally in the charcole canister. These canisters have been pretty much the same design for years. You could probably find another at a junk yard to fit , even if it was a different year/body. Seeing how a code finder found it . It's probably the electronic valve. It is a simple open close valve. 1 connector and usually 2 vacuum lines. You can also plug the line going to the intake. this will prevent a lean mixture from an unregisted air leak. The valve is used to direct tank vapors that accumulate in the canister at start up. At start up the valve opens and the engine sucks gas vapor from the canister . once the engine is started the valve closes .Vapor gas has a quicker ingnition point then liquid gas. A quick fix would be to simply plug the line going to the intake , with a bolt or screw to fit the end of the hose. This is only to prevent a lean mixture from air getting in behind the mass air flow sensor. The light on the dash will come on when the O2 sensor in the exhaust smell the lean mixture thats not being adjusted by the injectors as told to do. I run an older multi port fuel injected truck and have compleatly blocked all the emmisions systems off and removed them. It's only an emmisions device , it has nothing to do with the preformance of the engine (unless it allows a leak). Just plug it and have no worries of it becoming a problem
the evap system is one of the main reasons why most cars ses light is on.......we repair lots of these for all car brands every month.....#1 yes it is labor intensive but it is possible to do yourself if u have the proper tools...u would be surprised how many techs in this industry have no understanding of evap systems what they do and how they work...we have not replaced many vent valves,but that could be whats wrong....just for grins buy yourself a real gm gas cap and try before you make any repairs.....7 out of 10 times they fail any tests.....let your wife drive it there will be no issues on her trip///but you have a very nice truck and this issue needs to be repaired....
