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nicks2014sierra

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Justin101714 Enthusiast

Justin101714

Posted
Posted

Well, the OP isn't supplying enough info for a good response, but if I had to guess. Stuck open purge solenoid valve causing a P0455 which is going to cause your lean conditions on both banks since it's seen as a vacuum leak at the purge solenoid.

 

 

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nicks2014sierra Enthusiast

nicks2014sierra

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Usually caused by topping off tank

 

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Po496 is the code

Usually caused by topping off tank

 

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Po496 is the code

 

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Justin101714 Enthusiast

Justin101714

Posted
Posted

Po496 is the code

Po496 is the code

 

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That's exactly what I thought was wrong with it. Pull your purge solenoid off and see if you can blow through either end of it. If you can, its bad. It should be a normally closed solenoid with the key off. P0496 pretty much points exactly to this solenoid. The descriptor I'm sure is "too high purge when not commanded" something like that. I'm 98.9 percent sure you're gonna need one.

 

 

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nicks2014sierra Enthusiast

nicks2014sierra

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That's exactly what I thought was wrong with it. Pull your purge solenoid off and see if you can blow through either end of it. If you can, its bad. It should be a normally closed solenoid with the key off. P0496 pretty much points exactly to this solenoid. The descriptor I'm sure is "too high purge when not commanded" something like that. I'm 98.9 percent sure you're gonna need one.

 

 

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Where is it located

 

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Justin101714 Enthusiast

Justin101714

Posted
Posted

4.3 or 5.3?

 

5.3L beside the throttle body, below the map sensor. It has a single 10mm bolt that holds it on. You have depress the retaining clip on the hose and pull while holding the clip in place. Disconnect the connector.

 

 

4459fde94c61320266f4051217704131.jpg

 

65dd6a61239170c655a66522fd639a10.jpg

nicks2014sierra Enthusiast

nicks2014sierra

Posted
  • Author
Posted

4.3 or 5.3?

 

5.3L beside the throttle body, below the map sensor. It has a single 10mm bolt that holds it on. You have depress the retaining clip on the hose and pull while holding the clip in place. Disconnect the connector.

 

 

4459fde94c61320266f4051217704131.jpg

 

65dd6a61239170c655a66522fd639a10.jpg

4.3

 

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calgator73 Senior Enthusiast

calgator73

Posted
Posted

Isn't there another one near the canister that allows fresh air into the canister?

 

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Justin101714 Enthusiast

Justin101714

Posted
Posted
Isn't there another one near the canister that allows fresh air into the canister?

 

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This would be called the vent valve. But yea there is an other one back there. It operates opposite of the purge solenoid. The purge is normally closed and the vent is normally open. When the system is commanded to perform an evaporative leak test, the purge opens and pulls vacuum on the tank, the vent closes and seals the rear portion.

 

 

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calgator73 Senior Enthusiast

calgator73

Posted
Posted

Wouldn't you run lean only if the vent valve was stuck open?

 

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