I've been trying to track down the real reason for high pressure build up in my 93 3.0 For months.
You can skip this history part.
I used to use the truck regularly in condition that would stress it due to high temps and altitude changes of about 2000 feet.
The reached the point that basically only used the truck for winter snow plowing. I had done all the standard test on the system. It past all including the air passage and check valve test within the vapor canister. I search everywhere
I could think of for answer and it seems many others reached the same point.
This year with the warm weather and a clearer mind I took a fresh approach. I saw somewhere... (sorry it didn't register at the moment and I really can't credit the poster. In fact I'm not even sure it was a Toyota related site) ... anyway someone with the same test results bypassed the vapor canister and magic the issue was totally gone.
My truck sitting in the hot high altitude sun ( though temps was only about 57f) had pressure the tank before starting. Just idling to full warmup brought the tank pressure to alarming levels.
I tried the canister bypass. Issue gone completely.
A new $$$ canister is on the way. (I think a got a good deal here shipped from Japan by the the way. eBay seller : jdmplanet (?).
Now back to the reason for this post. I would like to offer for others the following study which I find quite interesting.
http://publications.jrc.ec.europa.e...36839/6839 - EVAP_Final_Report_final_isbn.pdf
Particularly interesting to me and my issue is this chart:
You can skip this history part.
I used to use the truck regularly in condition that would stress it due to high temps and altitude changes of about 2000 feet.
The reached the point that basically only used the truck for winter snow plowing. I had done all the standard test on the system. It past all including the air passage and check valve test within the vapor canister. I search everywhere
I could think of for answer and it seems many others reached the same point.
This year with the warm weather and a clearer mind I took a fresh approach. I saw somewhere... (sorry it didn't register at the moment and I really can't credit the poster. In fact I'm not even sure it was a Toyota related site) ... anyway someone with the same test results bypassed the vapor canister and magic the issue was totally gone.
My truck sitting in the hot high altitude sun ( though temps was only about 57f) had pressure the tank before starting. Just idling to full warmup brought the tank pressure to alarming levels.
I tried the canister bypass. Issue gone completely.
A new $$$ canister is on the way. (I think a got a good deal here shipped from Japan by the the way. eBay seller : jdmplanet (?).
Now back to the reason for this post. I would like to offer for others the following study which I find quite interesting.
http://publications.jrc.ec.europa.e...36839/6839 - EVAP_Final_Report_final_isbn.pdf
Particularly interesting to me and my issue is this chart:
