Ford 2003 Mustang Workshop Manual page 78

high idle during the
first cold start of the
day
A continuous, speed-
dependent rattle from
the engine — occurs
during idle or high idle
during the first cold
start of the day and
disappears as the
engine warms up
Idle vibration—a low-
frequency vibration (5-
20 Hz) or mild shake
that is felt through the
seat/floorpan
Idle vibration—a high-
frequency vibration
(20–80 Hz) or buzz,
that is felt through the
steering wheel or seat
Symptom Chart—Squeak and Rattle
Condition
Squeak—heard
inside the vehicle
when
closing/opening
the door
Squeak—heard
inside the vehicle
when
lifter/lash
adjuster).
Piston noise or
valvetrain noise
(bled down
lifter/lash
adjuster).
Cylinder misfire.
Engine or
torque
converter out of
balance.
Exhaust system
mounts bound
up.
Body mounts
loose.
Power steering
lines grounded
out.
Possible Sources
Insufficient
lubrication on
the door hinge
or check strap.
Internal door
components
loose, rubbing or
misaligned.
Worn or
damaged glass
run/channel.
Go To Pinpoint Test G
Using a scan tool, CHECK
the ignition system. CARRY
OUT a cylinder power test.
REFER to Section 303-00
VERIFY the torque
converter to crankshaft pilot
clearance is correct,
REPAIR as necessary. RE-
INDEX the torque converter
on the flex plate by 120° on
a 3 bolt converter or 180° for
a 4 bolt converter. REFER to
Section 307-01 . RETEST
the vehicle.
VERIFY concern occurs at
engine firing frequency.
CHECK that the exhaust
system vibrates at the same
frequency as the engine.
ADD 9–14 km (20–30 lb.) to
the tail pipe to test, CARRY
OUT Exhaust System
Neutralizing in this section.
INSPECT the body mounts.
REPAIR as necessary.
INSPECT that the power
steering lines are not
contacting the chassis or
each other. REPAIR as
necessary.
Action
LUBRICATE the hinge or check
strap.
CHECK the inside of the door.
TIGHTEN or ALIGN as
necessary. USE the Rotunda
Squeak and Rattle Kit to isolate
any rubbing components.
REPAIR or INSTALL a new
glass run/channel. REFER to
Section 501-11 .
.
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