A buzzing type noise may be noted from upper engine area at about 1900 RPM, under light acceleration. Our technicians tell us this can be caused by loose ignition coil bracket bolts. Coil bracket bolts should be checked for the correct torque before further diagnoses is performed.
Buzzing Type Noise From Upper Engine Area on Ford Ranger
Average mileage: 98,052 (30,000–199,000)
Engines affected: 2.3L 4 Cylinder, 3.0L V6, 4.0L V6
15 people reported this problem
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It makes a weird buzzing sound when motor is hot
There is a steady , rhythmic clicking noise coming from the rear engine compartment at idle, clearly heard even when radio is on at a low volume. it sounds like small panel or mechanical noise, like an open/close mechanism that runs constantly right behind or underneath the upper front dash. I asked a mechanic about it at a Ford dealership a few years ago and was told it doesn't hurt anything and can't be fixed.
A turbine type sound is heard when accelerating and also I believe even after I have reached speed.