Sierra 1500 2WD V6-4.3L (2008)
Ground Strap: Customer Interest
Audio System - Static/Ignition Noise on AM Band
TECHNICAL
Bulletin No.: 08-08-44-016
Date: May 12, 2008
Subject:
Ignition Noise On Radio AM Band (Install Spark Plug Wire Set And Ground Strap)
Models:
2007-2008 Chevrolet Silverado
2007-2008 GMC Sierra
with 4.3L Engine (VIN X - RPO LU3)
Condition
Some customers may comment on static or an ignition/electrical noise on the radio's AM stations. The ignition noise will be related to engine speed. The
noise will not be present when the radio is on and the engine is not running.
Cause
This condition may be caused by energy from the # 1 spark plug wire, being in close proximity to the steering column input shaft, which couples energy
onto the (electrically floating) steering system.
Correction
Technicians are to replace the spark plug wires on cylinders 1, 3 and 5 and install a ground strap on the power steering gear using the following
procedure:
1.
Replace the spark plug wire set on cylinders number 1, 3 and 5 with P/N 89060518. This set of spark plug wires will allow you to route the # 1
plug wire away from the steering input shaft. Ensure that all spark plug boots are properly seated at the spark plug and at the ignition coil. Refer to
the Spark Plug Wire Replacement procedure in SI for more information.
2.
Raise the vehicle. Support the vehicle with suitable safety stands. Refer to the Lifting and Jacking the Vehicle procedure in SI.
3.
Attach the smaller ring terminal end of the ground strap, P/N 06286800, to the power steering rack with a small hose clamp, P/N 11609970 (or
equivalent part obtained locally). Refer to the illustration above, which shows the ground strap attached to the power steering rack.
4.
Attach the larger ring terminal end to the frame using one of the splash shield mounting bolts. Remove the bolt from the splash shield and slide the
ring terminal between the splash shield and the frame and then reinsert the splash shield bolt.
5.
Lower the vehicle.
6.
Verify proper operation of the radio.
Parts Information
Warranty Information
