1998 Ford Ranger 4x4 4.0liter manual transmission 98000 miles, recently I noticed a hum, almost, coming from my engine I thought it was my air filter but after disconnecting the hose I discovered the noise was coming from either inside or behind the throttle body. It was really howling at me through the throttle body opening. When I engage first gear and put a load on the engine where the idle drops the noise goes away. Could it be a vibrating gasket or is it something more serious? I didn't think there were any moving or loose parts in the intake besides the throttle body. It is vibrating the whole air intake system, but get much less noticable if you move left or right from the center of air intake maniforld. I am not sure what could be causing this please help.
Saturday, July 8th, 2006 AT 12:31 AM