98 blazer...... evap code p0446.... evap codes can be so horible, so id like everyones input that has had this code or helped someone with it, what did they do to fix it, this is a popular one so im hoping i can nip it in the butt, i almost bought a purge solenoid today but i wanted expert advice from you all before i waste time and money, thanks in advance

 

this wont be much help but i would have this code pop up after driving exactly 40.5 miles i know this because i drive just a little over 20 miles one way to work and everyday i cleared it before i left for work and it would come back as soon as i would enter the driveway after clearing it about 4 times it finally just went away i know it doesnt sound right but thats my personal experiance its been 3 wks and still no code but i did find this while i was searching https://blazerforum.com/forum/showth...ighlight=p0446

 

I can't rememer if this was the code I was getting or not, but mine ended up being a wiring loom hitting the front drive shaft and cut 2 wires. Look around your front driveshaft for anything that could interfear with it.

my transmission was replace by the GM dealer and they didn't secure the loom...

I think mine was purge valve circuit malfuntion or something....



edit: the vent valve is mounted above your rear axle.... make sure the filter and hose(connects the vent valve to the evap canister behind drivers rear tire) aren't full of mud/dirt/etc.

 

I joined this forum 10/10 because of this same problem, so it's my duty to try to help out. I have a 97 Blazer 4x4 with the PO446 codes coming back. I 1st tried to replace the EVAP vent filter above the spare tire, which I could only find the the Chevy dealer ($25). SES came on again, (my neighbor has a scanner and can clear my codes, thanks Saul). I pulled out the charcoal canister suspecting that, and removed the 5/8 hose running from the canister to the vent valve while I was there. It had a suspect kink or at least a soft spot in it, so I got 42" of new 5/8 hose ($5) and re-routed it over the gas filler line instead of the short path. I have driven 3 of 4 days now with no new events. I hope will help somebody else.

 

i get this code about every 3 weeks or so. havent looked at the canistor yet, i thought it was a gas cap issue, but the gas cap seems tight and the seal looks good. has no running or drivability problems.