So close to being fixed/But as usual not there yet

[brc19761]

Hello every one. You can see the post I have been making about my 2008 Nissan Pathfinder evap system. To make a very long story short. The "service engine soon" light came on a couple of months ago. Found out it was a P0455 (evaporation leak). I bought two gas caps. One OEM from the Nissan Dealer. The code would always come back on. I studied the fsm and got great advice from the people on this message board.

A few weeks ago I took apart the entire evap systems and components. With my 12v tester I really didn't get the vent valve solenoid to work. Did not get the plunger to move up and down. I put everything back together and a new code showed up P0447 (Evaporation vent control circuit open. I would clear the code and as soon as you started it back up the "service engine soon" light would immediately come back on with the P0447.

Well today I bought a new vent valve solenoid. I got it on and cleared the code and the "service engine soon light" went off. I took it for a test drive and the light never came on while I was driving. When I got back home I turned the engine off so I could put it back in my shop (that is where I park it). Well after all that driving when I went to put it up the "service engine light soon" came on with the P0447 code.

I have no idea what it could be. I thought maybe a loose connection or something. The vent valve solenoid had quit working b/c before when I cleared the code the light would come back on immediately. Now it just comes on every now and then.

What could I be missing? What do I need to check? B/T gas caps and solenoid I have spent around a $140.00. I am about ready to put a piece of duct tape over the engine light. I feel like I am so close to fixing this issue, but with the engine light coming back on I feel like I have been wasting my time.
Thanks,

brc

[Leo1998]

Did you check the Purge Volume Control Valve to see if it's stuck open? Here's a thread that maybe give some ideas. I put the fuel filter in the line and have been driving with no problems for over 20k miles. I empty it periodically and the charcoal keeps coming..lol

having-problems-with-p1441-code-t462660.html

[4xq]

P0447 is an electrical circuit code. See this Nissan guide:
http://engine-codes.com/p0447_nissan.html
The problem now is most likely a loose connection I think.

I would carefully check the connector to the valve you replaced. Make sure the wires are tight in their connectors. Make sure the connectors fit tightly onto the electrical connections on the valve. Perhaps use some needlenose pliers to crimp things tighter.

[brc19761]

Thanks for the replies. I took the evap canister apart again to check for any mistakes I may have made installing the new vent valve solenoid. You really have to disconnect everything on the evap system (which is located behind the driver's side rear wheel) to get to the top of the evap canister where the vent valve solenoid is located. I checked the hoses and especially the wiring harnesses that plug into the evap solenoid and the canister. Put everything back together and made sure everything was where it was suppose to be and all tight.

I drove it around all day Saturday with no "service engine soon" light to come on "so far". I think I had a loose connection on the vent valve solenoid. I think it was tight when I connected it. But in such a tight space you are working in and connecting all the hoses and other wiring harnesses then re-installing the evap canister. I think the vent valve solenoid connection became loose in the process.

Anyway, I will keep an eye on everything as I drive and hope the service engine soon light doesn't come back on. If it does I am really tempted to just put duct tape over the gage cover where the light is located just where I won't have to see it when I drive .

Thanks everyone,

brc