Check engine light

[nicks2014sierra]

Evap emessions leak and to lean bank 1 and 2 are the codes any ideas on a fix

 

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[calgator73]

Large or small?

 

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[nicks2014sierra]

Large or small?

 

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What do you mean large or small

 

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[calgator73]

Evap leak. Code #?

 

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[Justin101714]

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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[calgator73]

Usually caused by topping off tank

 

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[nicks2014sierra]

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]

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]

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]

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.

 

 

 

[nicks2014sierra]

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.

 

 

 

4.3

 

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[Justin101714]

Same general area. It even looks the same. It's mounted around the intake manifold.

 

 

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[calgator73]

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

 

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[Justin101714]

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]

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

 

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