I have found engine oil in the throttle body on 1994 toyota tercel

Listen for a rough idle, look for oil on the throttle body and look for blue smoke coming out of your tailpipe. Replace the inexpensive PCV valve if you have these symptoms. It should only cost about $3.00 at the auto parts store. A bad PCV valve can cause your car's engine to start using a lot of oil.However if this does not stop the problem, then you must turn your attention to the internal workings of the engine (i.e., rings, pistons, valve guide seals). You may also want to have the front and rear seals on the crank checked for leaks as well.The PCV valve is on top of the valve cover. Should be a hose connected to it.----------------That's it.

It may be the pcv valve ( positive crankcase ventilation) that needs replaced. if a pcv valve fails, it will put oil in air cleaner or throttle body. check to be sure hose to valve is not clogged up. its only about a 5.00 part. have a good one !!