Some 2008 Ford Mustang vehicles equipped with a 4.0L engine may exhibit a buzz noise from the upper engine at about 1900 RPM under light load acceleration.
Follow the Service Procedure steps to correct the condition.
Prior to following normal diagnostics, check the fasteners that attach the ignition coil bracket to the intake manifold for proper torque.
If the bolts are found torqued under 89 lb-in. (10 N-m), proceed to Step 2.
If the bolts are found to be torqued correctly, this procedure does not apply and follow normal diagnostics.
Torque both ignition coil bracket to intake manifold bolts to 89 lb-in. (10 N-m). Then tighten an additional 45 degrees.
Eligible Under Provisions Of New Vehicle Limited Warranty Coverage IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.
2008 Mustang 4.0L SOHC: Torque The Ignition Coil Bracket Retainers Following The Service Procedure (Do Not Use With Any Other Labor Operations)