[4th Gen : 01-07]: p0455 is back
#1
#5
Trouble spots on the 2001-2007 minivans concerning EVAP codes.
There is a canister hose UNDER the air cleaner that splits. It's where a plastic tube transitions into a metal tube about 2 inches long.
The rubber connector tubes out a few inches from the purge valve will split.
The rubber hoses AT the canister.
Earlier models of this generation also have a small vapor hose connection as you move from the canister back towards the tank about half way in the middle of the van.
NVLD sits right under the left seal of the power steering rack and if the steering rack leaks,(which IS common) it soaks down the diaphragm in the NVLD causing an internal leak, which a smoke test will never find.
A previous poster was correct about the rusted filler tubes. We don't see this in Tennessee, but snow/salt belt vans will do this very often.
Very rarely the purge valve will have an internal leak.
Very rarely the NVLD switch will just plain stop working
The way we find internal leaks, is by using a smoke tester with the option of a ball check pressure test. You can't just use a fog machine because you have to have air pressure behind the smoke to force it through. BUT, you could always rig one up and charge your buddies...hehe.
There is a canister hose UNDER the air cleaner that splits. It's where a plastic tube transitions into a metal tube about 2 inches long.
The rubber connector tubes out a few inches from the purge valve will split.
The rubber hoses AT the canister.
Earlier models of this generation also have a small vapor hose connection as you move from the canister back towards the tank about half way in the middle of the van.
NVLD sits right under the left seal of the power steering rack and if the steering rack leaks,(which IS common) it soaks down the diaphragm in the NVLD causing an internal leak, which a smoke test will never find.
A previous poster was correct about the rusted filler tubes. We don't see this in Tennessee, but snow/salt belt vans will do this very often.
Very rarely the purge valve will have an internal leak.
Very rarely the NVLD switch will just plain stop working
The way we find internal leaks, is by using a smoke tester with the option of a ball check pressure test. You can't just use a fog machine because you have to have air pressure behind the smoke to force it through. BUT, you could always rig one up and charge your buddies...hehe.
Last edited by TNtech; 02-14-2016 at 02:22 PM.