hi i put a 98 corolla motor in a 2000 corolla both 1.8 after it was in i noticed that the 2000 has a valve in the cyl head on the left side front it looks like it belongs in the valve body in the trans.it seems to read the oil pressure off the timing chain .the 98 motor dont have a the hole in the head for it .and now the motor wont start .both the motors ran when i started .can someone tell me what this valve is and would it stop the motor from starting .i tried with it plug,ed in and just hanging there & not plug,ed in .i also have fuel and spark .any help would be greatly appreciate thank you