2003 FORD MUSTANG steering

components as necessary.
z Broken
powertrain
mounts. z
INSPECT the powertrain
mounts. INSTALL new
mounts as necessary.
REFER to Section 303 - 01A
for 3.8L engines or
Section 303 - 01B for 4.6L (2V)
engines.
z Idle speed too
high. z
CHECK for the correct idle
speed.
z Driveline clunk—
occurs as the vehicle
starts to move
forward following a
stop z
Worn or galled
driveshaft slip-
yoke splines. z
CLEAN and INSPECT the
splines of the yoke for a
worn or galled condition.
INSTALL a new yoke as
necessary. REFER to
Section 205 - 01 .
z Worn or galled
driveshaft and
coupling shaft
splines. z
CLEAN and INSPECT the
splines of the driveshaft and
coupling shaft for a worn or
galled condition. INSTALL a
new driveshaft assembly as
necessary. REFER to
Section 205 - 01 .
z Loose rear leaf
spring U- bolts. z
CHECK the U- bolts for
loose nuts. TIGHTEN to
specification. REFER to
Section 204 - 02 .
z Driveline clunk (FWD
vehicles)—occurs
during acceleration or
from cruise to
coast/deceleration z
Damaged or
worn inboard
constant velocity
(CV) joint. z
INSPECT the inboard CV
joint and boot. REPAIR or
INSTALL a new CV joint as
necessary.
z Driveline clunk (4WD
vehicles)—occurs
during shift- on-the- fly
engagement z
Clutch relay.
z Shift motor.
z Transfer case.
z GEM. z
CHECK the 4WD
engagement system.
REPAIR or INSTALL new
components as necessary.
z Clicking, popping or
grinding— occurs
while vehicle is
turning z
Inadequate or
contaminated
lubrication in the
(CV) joints. z
CHECK the CV boots and
joints for wear or damage.
REPAIR or INSTALL new
components as necessary.
z Another
component
contacting the
halfshaft. z
CHECK the halfshafts and
the area around the
halfshafts. REPAIR as
necessary.
z Brake
components. z
INSPECT the front brakes
for wear or damage.
REPAIR as necessary.
REFER to Section 206 - 03 .
z Steering
components. z
INSPECT the drag link,
inner and outer tie- rods or
idler arm for wear or
damage. REPAIR as
necessary. REFER to
Section 211 - 02 .
z Suspension
components. z
INSPECT the upper and
lower ball joints for wear or
damage. REPAIR as
necessary. REFER to Klj . 19 ba
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z
Loose rear
spring U- bolts. z
INSPECT the U- bolts.
TIGHTEN the U- bolt nuts to
specification. REFER to
Section 204 - 02 .
z Incorrect or high
CV joint
operating angle. z
CHECK vehicle ride height
is within limits. REPAIR as
necessary. REFER to
Section 206 - 00 .
z Damaged or
worn front
suspension
components. z
CHECK for a loose stabilizer
bar, damaged or loose
strut/strut bushings or loose
or worn ball joints. INSPECT
the steering linkage for wear
or damage. REPAIR or
INSTALL new components
as necessary.
z Driveline angles
out of
specification. z
CHECK for correct driveline
angles. REPAIR as
necessary. REFER to
Section 205 - 00 .
z U-joints binding
or seized. z
ROTATE the driveshaft and
CHECK for rough operation
or seized U- joints. INSTALL
new U- joints as necessary.
REFER to Section 205 - 01 .
z Binding,
damaged or
galled splines
on the driveshaft
slip- yoke z
CLEAN and INSPECT the
splines of the slip- yoke,
driveshaft and coupling
shaft for a worn, damaged
or galled condition.
INSTALL a new slip- yoke or
driveshaft assembly as
necessary. REPAIR as
necessary. REFER to
Section 205 - 01 .
z Driveline vibration—
occurs at cruising
speeds z
U-joints are
worn. z
CHECK for wear or incorrect
seating. INSTALL new U-
joints as necessary. REFER
to Section 205 - 01 .
z Worn or
damaged
driveshaft center
bearing support. z
CHECK the insulator for
damage or wear. ROTATE
the driveshaft and CHECK
for rough operation.
INSTALL a new center
bearing support as
necessary. REFER to
Section 205 - 01 .
z Loose axle
pinion flange
bolts. z
INSPECT the axle pinion
flange. TIGHTEN the pinion
flange bolts to specification.
REFER to Section 205 - 01 .
z Excessive axle
pinion flange
runout. z
CARRY OUT a Runout
Check. REPAIR as
necessary. REFER to
Section 205 - 01 .
z Driveshaft is
out-of- balance. z
CHECK the driveshaft for
damage, missing balance
weights or undercoating.
CHECK driveshaft balance. Klj . 22 ba
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(+40°F) or colder at
first start of the day
between ball
bearings and
bearing race.
z Power steering moan
— occurs at high idle
and possibly at idle
during the first cold
start of the day in
temperatures of
approximately - 18°C
(0°F) or colder. Noise
can even be a severe
screech for less than
one minute in very
cold temperatures of
approximately - 29°C
(- 20°F) or colder z
High fluid
viscosity, or
plugged
reservoir screen
in power
steering
reservoir
starves pump
causing
cavitation. z
Go To Pinpoint Test D .
z Generator whine —
during high electrical
loads at idle or high
idle, a high pitch
whine or moan is
emitted from the
generator z
Generator
electrical field
noise. z
Using an EngineEAR,
PROBE near the generator
housing. LISTEN for
changes in the noise level
while changing electrical
loads (such as rear defrost,
headlamps, etc.). CARRY
OUT a generator load test. If
the system passes the load
test, the noise is from the
generator bearings,
INSTALL new bearings. If
the system fails the load
test, INSTALL a new
generator. REFER to
Section 414 - 02 .
z Engine- driven cooling
fan moan — occurs
during the first start of
the day. It is most
objectionable near
idle speeds up to
2000 rpm. The noise
increases with rpm z
The viscous
cooling fan
clutch engages
until the fluid in
the clutch
reaches normal
operating
temperature,
causing the fan
to fully engage. z
Go To Pinpoint Test E .
z Drumming noise —
occurs inside the
vehicle during idle or
high idle, hot or cold.
Very low- frequency
drumming is very rpm
dependent z
Exhaust system
vibration excites
the body
resonances
inducing interior
noise.
z Engine vibration
excites the
body
resonances
inducing interior
noise. z
Go To Pinpoint Test F .
z Hissing noise —
occurs during idle or
high idle that is
apparent with the
hood open z
Vacuum leak or
idle air control
(IAC) valve flow
noise. z
Use the Ultrasonic Leak
Detector/EngineEAR to
locate the source. Scan the
air intake system from the
inlet to each cylinder intake Klj . 29 ba
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high idle during the
first cold start of the
day
lifter/lash
adjuster).
z 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 z
Piston noise or
valvetrain noise
(bled down
lifter/lash
adjuster). z
Go To Pinpoint Test G .
z Idle vibration—a low-
frequency vibration (5-
20 Hz) or mild shake
that is felt through the
seat/floorpan z
Cylinder misfire. zUsing a scan tool, CHECK
the ignition system. CARRY
OUT a cylinder power test.
REFER to Section 303 - 00 .
z Engine or
torque
converter out of
balance. z
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.
z Idle vibration—a high-
frequency vibration
(20–80 Hz) or buzz,
that is felt through the
steering wheel or seat z
Exhaust system
mounts bound
up. z
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.
z Body mounts
loose. z
INSPECT the body mounts.
REPAIR as necessary.
z Power steering
lines grounded
out. z
INSPECT that the power
steering lines are not
contacting the chassis or
each other. REPAIR as
necessary. Symptom Chart—
Squeak and Rattle Condition
Possible Sources Action
z Squeak— heard
inside the vehicle
when
closing/opening
the door z
Insufficient
lubrication on
the door hinge
or check strap. z
LUBRICATE the hinge or check
strap.
z Internal door
components
loose, rubbing or
misaligned. z
CHECK the inside of the door.
TIGHTEN or ALIGN as
necessary. USE the Rotunda
Squeak and Rattle Kit to isolate
any rubbing components.
z Squeak— heard
inside the vehicle
when z
Worn or
damaged glass
run/channel. z
REPAIR or INSTALL a new
glass run/channel. REFER to
Section 501 - 11 . Klj . 31 ba
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misaligned.
screws. REPAIR as necessary.
z Loose interior
component or
trim. z
CARRY OUT a "touch test".
ELIMINATE the noise by
pressing or pulling on interior
trim and components. USE the
Rotunda Squeak and Rattle Kit
to isolate any rattling/squeaking
components.
z Squeak or rattle—
noise with a
vibration concern z
Damaged or
worn body
mounts. z
INSPECT the upper and lower
absorbers and washers for
damage or wear. CHECK the
body mount brackets for
damage. CHECK the nuts and
bolts are tightened to
specifications. TIGHTEN as
necessary.
z Damaged or
worn sub- frame
mounts. z
INSPECT the upper and lower
absorbers for damage or wear.
CHECK the sub- frame for
damage. CHECK the nuts and
bolts are tightened to
specifications. TIGHTEN as
necessary. Symptom Chart—
Steering Noise/Vibration Condition
Possible Sources Action
z Steering grunt or
shudder — occurs
when turning into
or out of a turn at
low speeds
(temperature
sensitive) z
Steering gear or power
steering hoses. z
GO to Steering Gear
Grunt/Shudder Test
component test in this
section.
z Steering System
clonk— hydraulic
knocking sound z
Air in the steering
hydraulic system. z
CHECK for leaks in the
system. PURGE the air
from the system.
REFER to Section 211 -
00 .
z Power steering
pump moan —
loud humming
noise occurs when
the steering wheel
is rotated to the
stop position.
Produces a 120-
600 Hz frequency
that changes with
rpm z
Power steering hose
grounded out to
chassis. z
INSPECT the power
steering hoses. REPAIR
as necessary.
z Aerated fluid. zCHECK for leaks in the
system. PURGE the air
from the system.
REFER to Section 211 -
00 .
z Steering gear isolators. zINSPECT the isolators
for wear or damage.
REPAIR as necessary.
z Low fluid. zCHECK the fluid level. Klj . 33 ba
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REFILL as necessary.
z Power steering pump
brackets loose or
misaligned. z
CHECK bolts, brackets
and bracket alignment.
TIGHTEN bolts to
specification. REPAIR
or INSTALL new
brackets as necessary.
REFER to Section 211 -
02 .
z Steering gear clunk
— occurs only
while cornering
over a bump (can
be temperature
sensitive) z
Steering gear. zINSPECT the steering
gear for loose mounting
bolts. TIGHTEN as
necessary. REFER to
Section 211 - 02 .
z Feedback (rattle,
chuckle or
knocking noise in
the steering gear)
— a condition
where roughness is
felt in the steering
wheel when the
vehicle is driven
over rough
surfaces z
Column
intermediate/flexible
shaft joints damaged or
worn. z
INSTALL a new
intermediate/flexible
shaft. REFER to Section 211 - 04 .
z Loose, damaged or
worn tie- rod ends. z
TIGHTEN the nuts to
specification or
INSTALL new tie- rod
ends as necessary.
REFER to Section 211 -
02 .
z Steering gear
insulators or mounting
bolts loose or
damaged. z
TIGHTEN the bolts or
INSTALL new bolts as
necessary. REFER to
Section 211 - 02 .
z Steering column
intermediate shaft bolts
are loose. z
TIGHTEN the bolts to
specification. REFER to
Section 211 - 04 .
z Steering column
damaged or worn. z
REPAIR or INSTALL a
new steering column as
necessary. REFER to
Section 211 - 04 .
z Loose suspension
bushings, bolts or ball
joints. z
INSPECT the
suspension system.
TIGHTEN or INSTALL
new components as
necessary. REFER to
Section 204 - 01 .
z Feedback (nibble
at the steering
wheel) — a
condition where
slight rotational
movement is felt in
the steering wheel
when the vehicle is
driven over rough
or grooved z
Lateral runout in the
tire or wheel. z
GO to Pinpoint Test H . Klj . 34 ba
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surfaces
zYoke spring in the
steering gear. z
CHECK TSBs for
revised yoke spring for
applicable vehicles.
z Accessory drive
belt squeal/chirp—
when rotating the
steering wheel
from stop to stop z
Loose or worn
accessory drive belt. z
ADJUST or INSTALL a
new accessory belt as
necessary. REFER to
Section 303 - 05 .
z Power steering
gear hiss z
Steering column
intermediate/flexible
shaft- to-steering gear
is binding or
misaligned. z
REPAIR or INSTALL a
new
intermediate/flexible
shaft as necessary.
REFER to Section 211 -
04 .
z Grounded or loose
steering column boot at
the dash panel. z
REPAIR as necessary.
z Damaged or worn
steering gear input
shaft and valve. z
REPAIR or INSTALL a
new steering gear as
necessary. REFER to
Section 211 - 02 .
z Steering column
rattle z
Loose bolts or
attaching brackets. z
TIGHTEN the bolts to
specifications.
z Loose, worn or
insufficiently lubricated
column bearings. z
LUBRICATE or
INSTALL new steering
column bearings as
necessary. REFER to
Section 211 - 04 .
z Steering shaft
insulators damaged or
worn. z
INSTALL new
insulators. REFER to
Section 211 - 04 .
z Intermediate/flexible
shaft compressed or
extended. z
INSPECT the rubber
spider coupling for
damage. INSTALL a
new
intermediate/flexible
shaft. REFER to Section 211 - 04 .
z Steering column
squeak or cracks z
Insufficient lubricated
steering shaft
bushings. z
LUBRICATE the
steering shaft and shaft
tube seals.
z Loose or misaligned
steering column
shrouds. z
TIGHTEN or ALIGN the
steering column
shrouds.
z Steering wheel rubbing
against steering
column shrouds. z
REPOSITION the
steering column
shrouds.
z Insufficient lubricated
speed control slip ring. z
LUBRICATE the speed
control slip ring.
z Upper or lower bearing
sleeve out of position. z
REPOSITION the
bearing sleeves.
z Power steering
pump noisy z
Incorrect assembly of
components.
z Imperfections on the
outside diameter or z
REPAIR or INSTALL a
new power steering
pump as necessary.
REFER to Section 211 -Klj . 35 ba
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end surface of the
power steering pump
rotor.
z Damaged or worn
power steering pump
rotor splines.
z A crack on the inner
surface of the power
steering pump cam.
z Interference between
the power steering
pump rotor and cam.
z Damaged or worn
power steering pump
rotor and pressure
plates. 02 .
z Power steering
pump swish noise z
Power steering fluid
flow into the bypass
valve of the pump
valve housing with fluid
temperature below 54°
C (130°F). z
Acceptable condition.
z Power steering
pump whine noise z
Aerated fluid. zPURGE the air from the
system. REFER to
Section 211 - 00 .
CHECK for a leak in the
system.
z Damaged power
steering pump cam. z
REPAIR or INSTALL a
new power steering
pump as necessary.
REFER to Section 211 -
02 .
z Damaged valve cover
O-ring seal. z
REPAIR or INSTALL a
new power steering
pump as necessary.
REFER to Section 211 -
02 .
z Power steering
pump clicking
(mechanical) noise z
Power steering pump
rotor slippers too long,
excessive rotor slipper-
to-slot clearance or
damaged or worn rotor
assembly. z
REPAIR or INSTALL a
new power steering
pump as necessary.
REFER to Section 211 -
02 .
z Power steering
pump clatter noise z
Damaged corners on
the outside diameter or
the power steering
rotor or distorted rotor
slipper ring. z
REPAIR or INSTALL a
new power steering
pump as necessary.
REFER to Section 211 -
02 .
Symptom Chart—
Suspension Noise/Vibration Condition
Possible Sources Action
z Squeak or grunt— noise
from the front suspension,
occurs more in cold
ambient temperatures.
More noticeable over
rough roads or when
turning z
Front stabilizer
bar insulators. z
Under these conditions,
the noise is acceptable.
CHECK TSBs. Klj . 36 ba
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