code po 496
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,887
Likes: 981
From: Whitby Ont.
code po 496
c6 ls3, code popped up yesterday, Evaporative Emission System High Purge Flow, not sure what it means or how to fix it. i googled it and some of the older vehicles said charcoal in the canister was a problem, over filling at the gas station, which i don t do, when it shuts off, i m done. any ideas would be appreciated.
tia Al
tia Al
Team Owner
Joined: Sep 2005
Posts: 20,352
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From: Ventura County, Calif
Not a very common issue, but here is one I found for the purge valve solenoid on the front of the passenger side valve cover:
https://www.corvetteforum.com/forums...-solenoid.html
https://www.corvetteforum.com/forums...-solenoid.html
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,887
Likes: 981
From: Whitby Ont.
Not a very common issue, but here is one I found for the purge valve solenoid on the front of the passenger side valve cover:
https://www.corvetteforum.com/forums...-solenoid.html
https://www.corvetteforum.com/forums...-solenoid.html
i will nose around it tomorrow.
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,887
Likes: 981
From: Whitby Ont.
any chance it may correct itself over a bit of time and driving ?
from what i can find, it is not going to hurt it to drive a bit.
how does one define if it is the Solenoid on the engine, or the vent under the rear, that is the culprit ?
from what i can find, it is not going to hurt it to drive a bit.
how does one define if it is the Solenoid on the engine, or the vent under the rear, that is the culprit ?
Last edited by walleyejack; May 10, 2016 at 04:33 PM.
Race Director
Joined: Dec 2013
Posts: 12,502
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DTC Descriptor
DTC P0496: Evaporative Emission System Flow During Non-Purge
Circuit/System Testing
Start the engine.
Seal the EVAP system using the Purge/Seal function with a scan tool.
Observe the FTP sensor with a scan tool. The Fuel Tank Pressure Sensor parameter should be less than 1.7 volts after 90 seconds.
⇒ If the Fuel Tank Pressure Sensor parameter is greater than the specified range, replace the EVAP canister purge solenoid valve.
Repair,
http://www.mediafire.com/download/de...496_repair.pdf
And its a cheap enough part, so just replace it if you still have problems after popping the connectors off to clean and re-attach them and the problem does not go away!!!!!
Its the valve that the Orange connector is plugged into.
As for getting to it, remove the oil filler cap, pull straight up on the fuel rail cover to remove it from the motor, and it right there at the front of the valve cover. When you put the fuel rail cover back on, put some dielectric grease on the rubber grommets on it bottom, and it will make installing and remove the fuel rail cover again much easier.
DTC P0496: Evaporative Emission System Flow During Non-Purge
Circuit/System Testing
Start the engine.
Seal the EVAP system using the Purge/Seal function with a scan tool.
Observe the FTP sensor with a scan tool. The Fuel Tank Pressure Sensor parameter should be less than 1.7 volts after 90 seconds.
⇒ If the Fuel Tank Pressure Sensor parameter is greater than the specified range, replace the EVAP canister purge solenoid valve.
Repair,
http://www.mediafire.com/download/de...496_repair.pdf
And its a cheap enough part, so just replace it if you still have problems after popping the connectors off to clean and re-attach them and the problem does not go away!!!!!
Its the valve that the Orange connector is plugged into.
As for getting to it, remove the oil filler cap, pull straight up on the fuel rail cover to remove it from the motor, and it right there at the front of the valve cover. When you put the fuel rail cover back on, put some dielectric grease on the rubber grommets on it bottom, and it will make installing and remove the fuel rail cover again much easier.
Last edited by Dano523; May 10, 2016 at 07:44 PM.
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,887
Likes: 981
From: Whitby Ont.
DTC Descriptor
DTC P0496: Evaporative Emission System Flow During Non-Purge
Circuit/System Testing
Start the engine.
Seal the EVAP system using the Purge/Seal function with a scan tool.
Observe the FTP sensor with a scan tool. The Fuel Tank Pressure Sensor parameter should be less than 1.7 volts after 90 seconds.
⇒ If the Fuel Tank Pressure Sensor parameter is greater than the specified range, replace the EVAP canister purge solenoid valve.
Repair,
http://www.mediafire.com/download/de...496_repair.pdf
And its a cheap enough part, so just replace it if you still have problems after popping the connectors off to clean and re-attach them and the problem does not go away!!!!!
Its the valve that the Orange connector is plugged into.
As for getting to it, remove the oil filler cap, pull straight up on the fuel rail cover to remove it from the motor, and it right there at the front of the valve cover. When you put the fuel rail cover back on, put some dielectric grease on the rubber grommets on it bottom, and it will make installing and remove the fuel rail cover again much easier.
DTC P0496: Evaporative Emission System Flow During Non-Purge
Circuit/System Testing
Start the engine.
Seal the EVAP system using the Purge/Seal function with a scan tool.
Observe the FTP sensor with a scan tool. The Fuel Tank Pressure Sensor parameter should be less than 1.7 volts after 90 seconds.
⇒ If the Fuel Tank Pressure Sensor parameter is greater than the specified range, replace the EVAP canister purge solenoid valve.
Repair,
http://www.mediafire.com/download/de...496_repair.pdf
And its a cheap enough part, so just replace it if you still have problems after popping the connectors off to clean and re-attach them and the problem does not go away!!!!!
Its the valve that the Orange connector is plugged into.
As for getting to it, remove the oil filler cap, pull straight up on the fuel rail cover to remove it from the motor, and it right there at the front of the valve cover. When you put the fuel rail cover back on, put some dielectric grease on the rubber grommets on it bottom, and it will make installing and remove the fuel rail cover again much easier.
Al
Race Director
Joined: Dec 2013
Posts: 12,502
Likes: 3,628
No worries, but do clean the connectors and reconnect them with testing to just weed these out at the problem isntead. Hence the solenoid may be fine, and some how you have a bad connection, ground or cracked wire instead.
Last edited by Dano523; May 11, 2016 at 06:07 PM.
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Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,887
Likes: 981
From: Whitby Ont.
Now that I replace the one on the engine is it safe to say I replace the one in the back under the fender that it will be good to go? I don't know of any other options right now ?
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,887
Likes: 981
From: Whitby Ont.
Stealership says could be the canister or could be the vent in the back, vent is $23 and the bloody harness is $42. crazy, i need to talk to the shop wizard before i replace anything else needlessly.
Safety Car
Joined: May 2011
Posts: 3,807
Likes: 508
From: Oshawa, Ontario
dirt cheap
For peanuts change the $23. rear vent .most don't need the harness replaced
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,887
Likes: 981
From: Whitby Ont.
I was looking for the valve yesterday, jacked up, wheels off, couldn t see it. But, i am old, so ...
Safety Car
Joined: May 2011
Posts: 3,807
Likes: 508
From: Oshawa, Ontario
The dealer told me that when you replace vent the harness doesn't hook up to it I need the replacement harness adapter harness. Just what i was told. 23 bucks is nothing. The BS 4" harness adaptor tho. GM has to make money somehow.
I was looking for the valve yesterday, jacked up, wheels off, couldn t see it. But, i am old, so ...
I was looking for the valve yesterday, jacked up, wheels off, couldn t see it. But, i am old, so ...
Last edited by irok; May 15, 2016 at 05:36 PM.
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,887
Likes: 981
From: Whitby Ont.
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,887
Likes: 981
From: Whitby Ont.
just an update, took it in to the dealer 
he did some more tests, and is nothing to do with vent or solenoid really, says there is a constant ground, and makes it pull too much vacuum, and tricks the ecm, so either a wire melted somewhere or something in the ecm that the tuner missed in Janurary, but i can t see that, because it is only happening now, and been driving it, so must be a wire, he is going to spend a bit of time on it to see what he can find out.
he did some more tests, and is nothing to do with vent or solenoid really, says there is a constant ground, and makes it pull too much vacuum, and tricks the ecm, so either a wire melted somewhere or something in the ecm that the tuner missed in Janurary, but i can t see that, because it is only happening now, and been driving it, so must be a wire, he is going to spend a bit of time on it to see what he can find out.
Last edited by walleyejack; May 17, 2016 at 10:53 AM.
