Caribou Gear

EVAP issue

Oneye

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Joined
May 26, 2015
Messages
632
Location
Utah
I have a 2011 Silverado 5.3 liter, and have a check engine light on due to a PO442-small EVAP leak. I have replaced the EVAP vent control solenoid, and the purge valve. I purchased a smoke machine, used that tonight and cannot see any leaks in the system. The only place it was showing smoke was the line coming from the EVAP vent valve solenoid to the fuel filler cap, I believe that is normal considering the truck is off, and the EVAP vent valve shuts when the truck checks its system correct? As I said that vent valve is brand new lines and all. I disconnected that line on the charcoal canister and checked the system. There was no smoke coming from anywhere that I saw, and I tried smoking it multiple times to be sure. So my question is where to go from here. Is it the charcoal canister? The fuel tank pressure sensor? In the system those are kind of what I’m down to considering I saw no actual leaks? Just curious what anyones thoughts are who might have any with this annoying insignificant issue that keep illuminating my check engine light.
 

Oneye

Active member
Joined
May 26, 2015
Messages
632
Location
Utah
Check your fuel cap.
The fuel cap has been changed as well, and there was no smoke coming from that area when I tested the system. I do wonder if that may be the issue of it being improperly twisted on or something from time to time. I can clear the code and it’ll go away for a month+ before returning.
 

Hilljackoutlaw

Well-known member
Joined
Jan 15, 2019
Messages
3,522
I have a 2011 Silverado 5.3 liter, and have a check engine light on due to a PO442-small EVAP leak. I have replaced the EVAP vent control solenoid, and the purge valve. I purchased a smoke machine, used that tonight and cannot see any leaks in the system. The only place it was showing smoke was the line coming from the EVAP vent valve solenoid to the fuel filler cap, I believe that is normal considering the truck is off, and the EVAP vent valve shuts when the truck checks its system correct? As I said that vent valve is brand new lines and all. I disconnected that line on the charcoal canister and checked the system. There was no smoke coming from anywhere that I saw, and I tried smoking it multiple times to be sure. So my question is where to go from here. Is it the charcoal canister? The fuel tank pressure sensor? In the system those are kind of what I’m down to considering I saw no actual leaks? Just curious what anyones thoughts are who might have any with this annoying insignificant issue that keep illuminating my check engine light.
My 2009 has same problem. I've replaced solenoid and valve 3x and light would go off for a month or so and back. I finally just gave up. But gosh darn it's annoying!
 

Oneye

Active member
Joined
May 26, 2015
Messages
632
Location
Utah
My 2009 has same problem. I've replaced solenoid and valve 3x and light would go off for a month or so and back. I finally just gave up. But gosh darn it's annoying!
I’m afraid I’m going to have to come to the same terms😂😂 I can’t stand that orange engine light every day!!!😂
 

dan.kirkpatrick

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Joined
Jul 9, 2010
Messages
1,950
Location
mulino oregon
did you put a factory gas cap on ? alot of the aftermarket,{even napa} new fuel caps are just junky brand new,,other areas ive found over the years is the solonoid on dr side front valve cover,{usual culprit} or once i found the leak at the connection at the top of the fuel tank.//your on the right track with the smoke machine though,,good luck
 

wllm1313

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Joined
Dec 9, 2015
Messages
12,390
Location
Boston
Had a similar thing happen on my corolla, replaced the solenoid at about 170k miles. At about 200k the check engine light would randomly pop on I would just clear the code and wouldn't show up again for 6 months to a year. 🤷‍♂️

I was wondering if it could be environmental conditions or something... definitely seems to click on when seasons change and we are getting cold nights and hot days.
 

wolfpup

Well-known member
Joined
Jul 14, 2015
Messages
345
I feel ya! 2004 Chevy Suburban with the same assumed issue for like 150,000 miles. Changed the canisters, caps, evap stuff, all to have the light show back up. 270,000 miles on it now so I just live with it.
 

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