Evap codes, low AND high flow?!? (4 Viewers)

[linuxgod]

Got these on my drive home from Denver on Saturday. I thought it might be a loose gas cap, but I cleared and tightened and they’re back this morning. Sigh. I’m going to order a new gas cap but I’m concerned given the recent transmission work, as both post-cat O2 sensors were also replaced (due to a code specific to that)

 

[CanadianRockyCruiser]

Good time for a smoke test, if you can put one together.

Check all of the evap hose junctions to the canister. Some of them can look plugged in but be loose.

Try to use a borescopic camera, if you've got a long range tank.

 

[kcjaz]

I thought there was a thread here on how to do a smoke test. I couldn’t find that but @TeCKis300 ’s thread does have a pic plus lots of other good info.

200-Series Cruisers

2008-2021 : Lexus LX570 and 200-series Toyota Land Cruiser (J200)

forum.ih8mud.com

 

[TeCKis300]

Codes seem to indicate a legit leak/issue and you're probably right it was due to the recent service.

Here's a homebrew smoketest contraption using baby oil, soldering iron, and regulated low flow air.

Post in thread 'Anatomy of P0456 - Small Evap Leak'

Mar 11, 2022

How did you narrow down the leak to the evap canister, and not a slight leak in an evap line?

DId you smoke test?

Yes, did several rounds of various smoke and pressure tests at different points. Challenging with the LRA aux tank covering a lot of access.

• TeCKis300

• 

 

[linuxgod]

I’m hoping it’s the gas cap, since I swapped mine for @kcjaz’s cap at COTR, then I only drove a couple times before I left the truck in Denver. New one will be here Friday.

If it’s still throwing codes after that, I’ll probably take it somewhere to have them smoke test… probably my dealer because there aren’t a lot of shops around I’d trust.

Could be any issue with the charcoal canister. Before COTR I was getting fuel smell in the cabin while driving route 50 through Nevada every time we went over a pass (hence why I swapped gas caps). If they find a leak somewhere else that could be from the transmission swap then I’ll discuss with Slee.

 

[kcjaz]

I’m hoping it’s the gas cap, since I swapped mine for @kcjaz’s cap at COTR, then I only drove a couple times before I left the truck in Denver. New one will be here Friday.

If it’s still throwing codes after that, I’ll probably take it somewhere to have them smoke test… probably my dealer because there aren’t a lot of shops around I’d trust.

Could be any issue with the charcoal canister. Before COTR I was getting fuel smell in the cabin while driving route 50 through Nevada every time we went over a pass (hence why I swapped gas caps). If they find a leak somewhere else that could be from the transmission swap then I’ll discuss with Slee.

Hope its your (my old) gas cap too but my issue with codes at Cruise Moab ended up being a lose hose clamp on my filler neck of the LRA. It’s possible that my gas cap was bad too but I replaced it before I figured out the hose clamp.

 

[laserturbo91]

I can mail you my smoker and you can just bring it with you ‘Rocks if you want

 

[GrouchyTech]

Check for rodent damage.

 

[linuxgod]

Check for rodent damage.

Other than at the evap canister I’m not really sure where to look.

My plan of attack at the moment is:
1. New gas cap. From what I’ve read if you get a P043E or F it’s by definition not a gas cap issue but it’s one of the few things I know changed
2. Run tech stream, as I’ve read there’s a charcoal canister test available
3. Smoke test (thanks @laserturbo91)
4. If I still can’t find the fault then it’s probably dealer time. I have very limited free time through the end of the year so sadly I don’t think I’ll be able to track this down