Remove entire evap system? - Chevy Colorado & GMC Canyon
 
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post #1 of 8 (permalink) Old 08-15-2016, 06:29 AM Thread Starter
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Remove entire evap system?

After 4 different evap codes the last 6 months Im getting fed up by this. Is there any way to remove the system all together without setting of codes?
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post #2 of 8 (permalink) Old 08-15-2016, 07:08 AM
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You might be able to get a tune to prevent the DTCs from appearing. Check with the guys over at 355nation.net. It may cost you more than a repair. What have you done to correct the problem and what are the codes?

What engine do you have?

Last edited by cart7881; 08-15-2016 at 07:11 AM.
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post #3 of 8 (permalink) Old 08-15-2016, 12:22 PM Thread Starter
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First, I got p0446. The solenoid didn't get 12v so I had to replace the wiring. It was fine for a while, until I got check fuel cap message. Replaced fuel cap, then I got the purge valve code. Replaced it and it was fine for a while but today I got the p0446 again. Ive soon replaced the entire system, and it is not cheap.
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post #4 of 8 (permalink) Old 08-15-2016, 02:50 PM
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DTC P0446: Evaporative Emission (EVAP) Vent System performance. Indicates a blockage of the vent. Can be caused by the Canister Vent Solenoid Valve stuck closed. Was the "purge valve", that you replaced, on the engine or the canister?

You can check to see if the Vent Solenoid Valve is causing it by disconnecting the hose going from the canister to the valve and erasing the DTC. If a stuck Vent Valve is the problem, the P0446 should not return, but you will get another DTC for a "leak" due to that hose being disconnected.
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post #5 of 8 (permalink) Old 08-16-2016, 06:57 PM
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I had a problem like this with my Nissan 2010. Canister purge valve clogged up all the time from off-roading. Had the canister cleaned once and replaced once under warranty. After that I gave up caring about the code. I drove it for about 30K with the check-engine light on and even the dealership gave up caring about it and never even mentioned it again. I thought it was just a stupid design on the Nissan, but I guess it's more widespread.
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post #6 of 8 (permalink) Old 08-16-2016, 10:52 PM
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I did the solenoid 4 or 5 years ago on my 2007 and used the solenoid from a H3 hummer as it didn't come with the hose and was around $35 if i recall.
I did throw a P0449 code however no P0446

If you need the solenoid you want PN 25932569
https://www.amazon.com/ACDelco-214-2...words=25932569

EVAP vent valve


On my sisters 06 Silverado P0446 ended up being the vent located on the top of the gas tank where the fuel lines hookup we dropped the tank and swapped it out and that was much longer process then the solenoid.
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post #7 of 8 (permalink) Old 08-17-2016, 05:27 AM
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Quote:
Originally Posted by braindead1684 View Post
I did the solenoid 4 or 5 years ago on my 2007 and used the solenoid from a H3 hummer as it didn't come with the hose and was around $35 if i recall.
I did throw a P0449 code however no P0446

If you need the solenoid you want PN 25932569
https://www.amazon.com/ACDelco-214-2...words=25932569

EVAP vent valve


On my sisters 06 Silverado P0446 ended up being the vent located on the top of the gas tank where the fuel lines hookup we dropped the tank and swapped it out and that was much longer process then the solenoid.
4 or 5 years ago that information was valid. GM has since discontinued using that valve. The link, on Amazon, for that valve shows that it has a square shaped connector and is the replacement for the original 214-2147. The harness connectors on the 214-2147/25932569 valves had an oval configuration which matched the 355s, however, the newer valves have a square connector. Using that valve will necessitate purchasing a jumper harness in addition to the valve.

Vent valve, ACDelco 214-2149/GM 25932571, can be used instead and it has the oval connector configuration so no additional parts are required. It is also available from Amazon.

Last edited by cart7881; 08-17-2016 at 05:30 AM.
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post #8 of 8 (permalink) Old 08-17-2016, 05:57 AM
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You can also get aftermarket ones from Dorman and others. It is a high failure item. That is why there are multiple aftermarket suppliers offering them cheaper than GM / Delco. I have a Dorman one on mine.

2005 White 2wd Z71 WT
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