2001-2010 B4000 – BUZZ NOISE – UPPER ENGINE
2010 B4000 (Canada only)
Buzz noise from the upper engine at about 1900 RPM under light load acceleration.
- Prior to following normal diagnostics, check the fasteners (A) 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.