Lighting - Headlamps/Interior Lamps Flicker
Bulletin No.: 07-08-42-008Date: May 09, 2007
TECHNICAL
Subject:
Headlamps and/or Interior Lamps Flicker (Replace Ignition Coil and Add Ground Strap)
Models:
2007 Chevrolet Impala, Monte Carlo
with 3.9L Engine (VIN Code R - RPO LZ8)
Condition
Some customers may comment that the headlamps and/or interior lamps flicker while driving.
Upon investigation, the technician may find that the lamps flicker when switching between 3 and 6 cylinder mode, mostly at highway speeds.
Correction
Replace the ignition coil and add ground strap following the procedure below.
Remove the intake manifold cover.
Disconnect the ignition coil electrical connector.
Disconnect the left side spark plug wires from the ignition coil.
Disconnect the right side spark plug wires from the ignition coil.
Remove the 4 bolts attaching the ignition coil to its mounting bracket and remove the ignition coil.
Remove the ignition coil from the mounting bracket.
Loosen the 2 lower ignition coil mounting bracket nuts.
Remove the 2 upper ignition coil mounting bracket bolts and discard.
Install the ground strap (1), P/N 12581176, to the upper left side of the bracket as shown between the coil bracket and intake. Install the new bracket bolt, P/N 11515756, (do not tighten at this time). Prior to
installing the ground strap, remove the captured nut and washers. they are
not needed (simply pound them out with a hammer on a vise).
Install the washer (2), P/N 02436162, to the upper right side of the bracket between the coil bracket and intake. Install the new bracket bolt, P/N 11515756, (do not tighten at this time).
Tighten
Tighten all the ignition coil bracket bolts and nuts to 25 N.m (15 lb ft).
Install the new ignition coil to the mounting bracket.
Install the other end of the ground strap to the coil as shown and secure using a new bolt, P/N 11588715. Install the other 3 ignition coil bolts.
Tighten
Tighten the bolts to 10 N.m (89 lb in).
Connect the right side spark plug wires to the ignition coil.
Connect the left side spark plug wires to the ignition coil.
Connect the ignition coil electrical connector.
Install the intake manifold cover.
Parts Information
Warranty Information
For vehicles repaired under warranty, use the table.
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