Air intake boot is fine, but I found another hose with a very bad split. This is the larger of the two hoses that comes off of the smaller box connected to the air filter housing. Does this route unburnt fumes back into the engine?

Dealer replaced an O2 sensor to try to fix this problem a while back.

--Hugh

94' 4Runner SR5 3.0L, 4X4, 5-speed, 200K

01' Sienna XLE, 105K, auto everything...

91' Ford F-250, 7.3 liter IDI diesel, 5-speed, 170K