Buzzing Type Noise From Upper Engine Area on Ford Ranger

Problem Description and Possible Solution

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.

Problem Data
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Average mileage: 98,052 (30,000–199,000)
Engines affected: 2.3L 4 Cylinder, 3.0L V6, 4.0L V6
11 model years affected: 1997, 2001, 2002, 2003, more2004, 2005, 2006, 2007, 2008, 2009, 2010
15 people reported this problem
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Viewing 1 - 3 of 3 comments
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.