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rjwtaxman · 05-08-2008, 11:53 AM

Hey guys I've had the same codes 441 446 455 for over a month. every time the computer is reset. between 50 and 70 miles later the engine check illuminates again and the same three codes pop up. to date I have changed the gas cap, the PMV valve (56 bucks) checked all the vacuum hoses accessible in the engine compartment. all hoses held between 10-5 bar vacuum without dropping off. when the PMV valve lost vacuum( a full 10 bar in about the same 10 seconds. even though when the elect. were applied to the switch and you could hear the valve operating. I decided to change it.

that however did not fix the problem. the same three codes popped up.
by accident while i had the vacume tester hooked up again to the PMV
valve my brother lightly tapped the new valve and the vacume dropped off from about 8 down to zero. since we had the tester hooked to the hose coming from the valve maby the factory squizzy clamps were worn and loose, allowing small leaks. well we decided to replace all the squizzy clamps with little radiator screw down type clamps. when we tapped the valve again no loss of vacume was evident. now my tundra is a 2004 4.7 and the pmv valve hangs on the right side, top of the engine. tarheel is still working the problem. will let you know what we find next.

05-08-2008, 11:53 AM	#15 (permalink)
rjwtaxman Junior Member Join Date: May 2008 Posts: 1	tarheel toyota Hey guys I've had the same codes 441 446 455 for over a month. every time the computer is reset. between 50 and 70 miles later the engine check illuminates again and the same three codes pop up. to date I have changed the gas cap, the PMV valve (56 bucks) checked all the vacuum hoses accessible in the engine compartment. all hoses held between 10-5 bar vacuum without dropping off. when the PMV valve lost vacuum( a full 10 bar in about the same 10 seconds. even though when the elect. were applied to the switch and you could hear the valve operating. I decided to change it. that however did not fix the problem. the same three codes popped up. by accident while i had the vacume tester hooked up again to the PMV valve my brother lightly tapped the new valve and the vacume dropped off from about 8 down to zero. since we had the tester hooked to the hose coming from the valve maby the factory squizzy clamps were worn and loose, allowing small leaks. well we decided to replace all the squizzy clamps with little radiator screw down type clamps. when we tapped the valve again no loss of vacume was evident. now my tundra is a 2004 4.7 and the pmv valve hangs on the right side, top of the engine. tarheel is still working the problem. will let you know what we find next.