B4000 V6-4.0L SOHC (2005)
Intake Manifold: All Technical Service Bulletins
Engine/Ignition - Buzz At Approximately 1,900 RPM
Bulletin No: 01-018/10
Last Issued: 03/24/2010
Subject:
BUZZ NOISE - UPPER ENGINE
APPLICABLE MODEL(S)/VINS
2001-2009 B4000
2010 B4000 (Canada only)
DESCRIPTION
Some vehicles may exhibit a buzz noise from the upper engine at about 1900 RPM under light load acceleration.
Customers having this concern should have their vehicle repaired using the following repair procedure.
REPAIR PROCEDURE
1. Verify customer concern.
2. Prior to following normal diagnostics, check the fasteners (A) that attach the ignition coil bracket to the intake manifold for proper torque.
a. If the bolts are found torqued under 89 lb-in. (10 N.m), proceed to Step 3.
b. If the bolts are found to be torqued correctly, this procedure does not apply and follow normal diagnostics.
3. Torque both ignition coil bracket to intake manifold bolts to 89 lb-in. (10 N.m). Then tighten an additional 45 degrees.
4. Verify repair.
