Pesky P0446 Issue - Need Ideas please

Well, this has been an interesting(?) issue. Been having the P0446 CEL come on about every few months/several hundred miles.

So far:

• New evap solenoids
• New canister
• New gas cap

Most recent change (canister) seems to have lasted the longest. Today, it came back on with the same CEL code.

Anything else I can check, that might cause the system to think it is okay for a while?

Much thanks

 

My internet guess is small leak





a smoke test will get to bottom of things

can make your own (vids out there)
And
Another member found one while back for less than $180 (new)and posted where to buy
GL

 

THanks

 

I found this thread
$120!

https://www.tacomaworld.com/threads/po442-po456-codes-on-an-off.776639/#post-27767161

 

Oh, thanks. I ordered the economy version along with the gas cap adapter.

 

I want to try the harbor freight fluid transfer pump with a cigar on the intake side as a smoke machine. It might even work, or I will find someone with a powerful vape to blow a cloud into the manifold.

 

My P0446 code eventually went away after replacing the rear O2 sensor as I chased a P0420 code. I can’t explain why it worked but I never saw the P0446 code after replacing that O2 sensor.

 

Thanks, waiting on tester to arrive.

 

https://youtu.be/Qk7se8-7j6s?feature=shared

 

DagNabIt. Smoke test passed. Feeling stumped at the moment. Reset CEL, will, again, monitor to see how long it goes before coming back on.