What prompted me to look at it was they are going to charge me another $100 to plug in their code reader again just to fix the same problem. Well It was worth a try to see if it was something that I could fix. I doubt that I can change the vent valve from laying on the ground with the car jacked up, not enough room. Unless you have some ideas I think I'm done. Then lower (not remove) the gas tank to get access to the vent valve (there are other steps like unhooking the filler neck, etc.). The instructions say to lower the exhaust system towards the rear of the car. Seems it's mounted on the right rear of the gas tank behind the evap canister, very hard to see as it's mounted near the top of the gas tank. I have found the vent valve by accessing the repair manual online. So I can assume it's a problem with the vent valve (I had this diagnosed awhile back & one thing they found was the resistance on the vent valve was too high, the estimate to fix was $600 to start)? Unhooked the electrical connection & evap hose, blew into purge valve and no air passes through, so it is closed. OK, checked the purge valve on the engine. Am I correct in assuming that the purge valve is what opens to provide the vacuum in the fuel tank when needed (during Evap System testing I guess)? You said P0455 was vacuum in the fuel tank when it wasn't supposed to be there. The new valve I got does not look anything like the one on the engine. I have taken the starter off and had it tested. I have no evidence that there is an issue with the PassKeyIII stuff. I took the top cover off the engine and did locate the solenoid valve (item #3) as you indicated in your thumbnail above. I noticed that even though the gas tank is full, it is not registering when I turn the key. I looked up the canister on the internet & found photos of all sides of the canister and that new part is not on the canister, unless it's under a cover or located on the gas tank where I can't see it. I jacked the car up and I can't see anything that looks like this new part on or around the Evap canister. He said no, it's down at the gas tank/Evap Emiss Canister, the one on the engine is the purge valve. I asked him if that was located on the engine. Went to a dealer today to get the Evap Emission Vent valve/solenoid (he gave me a Delco/GM part #25932570, pic attached).
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