New member here...2004 Grand Marquis GS, 4.6L, 187K miles...serviced regularly. Recent intake manifold replacement, otherwise, no major mechanical issues...until now. The engine started making a "squawking" sound...literally sounds like a turkey call. I replaced both the belt and the tensioner..still squawking. The idler appears OK, no wobble or rough spots. I used a hose to listen to the alternator at idle, sounds smooth. The water pump has a slight squeak, but nothing that should lead to the loud sound I am hearing (BTW, one can hear the squawking while in the car, traveling at 55 mph). The A/C pulley and Power Steering pump seem fine. The squawking is constant and loudest when driving the car and trails off to a stop when the car is stopped. It rarely squawks when at idle. My gauges read AOK. I am puzzled. Any ideas? All input/advice/prayers are welcome.