oil on plugs?

[toad]

thanks! i'll check amazon right now for one. would this cause the issue i'm having with rough idle? it might still be the idle control valve, but i can't seem to access it other than sticking q-tips soaked with throttle body cleaner down into the opening from inside the throttle body(the screws are stripped).

also, are any special tools required to remove/replace the gasket? i noticed the bolts look just like standard size on the top of the valves. just hoping i'm not missing anything! will i need a silicone sealant to apply to the new gasket or do they self-seal?

thanks again!

[B.B._07]

The 1NZ-FE has the valve cover gasket combined with the spark plug tube seals so it's probably your valve cover gasket. Before you go replacing it make sure the 10mm bolts and nuts securing the valve cover gasket have not worked themselves loose (they should be torqued to 10Nm or 7 ft-lb). To replace the valve cover gasket you'll need a 10mm socket and a small pry bar or large flathead screwdriver. Toyota recommends applying a small amount of FIPG (Toyota Black Seal Packing/Threebond 1207B or equivalent) on the passenger side of the valve cover. If you don't feel like buying the dealer sealant you can use Permatex Ultra Grey or Black or any RTV sealant recommended for valve cover gaskets.

[tmontague]

Originally Posted by toad

thanks! i'll check amazon right now for one. would this cause the issue i'm having with rough idle? it might still be the idle control valve, but i can't seem to access it other than sticking q-tips soaked with throttle body cleaner down into the opening from inside the throttle body(the screws are stripped).
thanks again!

What year yaris do you have? I'm pretty sure they don't have an idle control valve due to the electronic throttle control (at least my 2008 doesn't)

Oil on the plugs could potentially cause a rough idle due to fouling of the plugs but generally it would trigger a misfire code if that happened.