Test G FORD MUSTANG 2003 Owner's Manual

z
Generator electrical
field or bearings. z
CARRY OUT generator
load test. REPAIR or
INSTALL a new generator
as necessary. REFER to
Section 414 - 02 .
z Drone type noise zExhaust system. zCARRY OUT the Exhaust System Neutralizing in this
section. REPAIR as
necessary.
z A/C compressor. zCHECK for noise with
vehicle at constant speeds.
CYCLE the compressor on
and off and listen for a
change in pitch. REPAIR as
necessary. REFER to
Section 412 - 03 .
z Powertrain mounts. zCARRY OUT the
Powertrain/Drivetrain Mount Neutralizing in this
section.
z Sputter type
noise— noise
worse when cold,
lessens or
disappears when
vehicle is at
operating
temperature z
Damaged or worn
exhaust system
components. z
INSPECT the exhaust
system for leaks or
damage. REPAIR as
necessary. REFER to
Section 309 - 00 .
z Rattling noise—
noise from the
upper engine
(valve train).
Worse when
engine is cold z
Low oil level. zCHECK oil level. FILL as
necessary.
z Thin or diluted oil. zINSPECT the oil for
contamination. If oil is
contaminated, CHECK for
the source. REPAIR as
necessary. CHANGE the oil
and filter.
z Low oil pressure. zCARRY OUT an oil
pressure test. If not within
specifications, REPAIR as
necessary. REFER to
Section 303 - 00 .
z Worn rocker
arms/fulcrums or
followers. z
CARRY OUT a valve train
analysis. INSTALL new
valve train components as
necessary. REFER to
Section 303 - 01A for 3.8L
engines or Section 303 - 01B
for 4.6L (2V) engines.
z Worn valve guides. zCARRY OUT a valve train
analysis. INSTALL new
valve guides as necessary.
REFER to Section 303 - 01A
for 3.8L engines or
Section 303 - 01B for 4.6L (2V)
engines. Klj . 26 ba
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z
Excessive runout of
valve seats on the
valve face. z
CARRY OUT a valve seat
runout test. INSPECT the
valve face and seat.
INSTALL new valves as
necessary. REFER to
Section 303 - 01A for 3.8L
engines or Section 303 - 01B
for 4.6L (2V) engines.
z Rattling noise—
from the bottom
of the vehicle z
Loose muffler shields
or catalytic converter
shields. z
CHECK the exhaust
system for loose exhaust
shields. REPAIR as
necessary.
z Thumping
noise— from the
bottom of the
vehicle, worse at
acceleration z
Exhaust pipe/muffler
grounded to chassis. z
CHECK the exhaust
system to chassis
clearance. CHECK the
exhaust system hangers for
damage. REPAIR as
necessary. REFER to
Section 309 - 00 .
z Whoosh— occurs
during light
vehicle
acceleration.
Heard inside the
vehicle z
Throttling late,
creating turbulence
transmitted through
the plastic manifold. z
CHECK for leaks or
missing seal in the dash
panel.
z Engine
vibration—
increases
intensity as
engine rpm is
increased z
Engine out-of-
balance. z
CARRY OUT Neutral
Engine Run- Up (NERU)
Test. ROTATE the torque
converter, 120° for 3 bolt
and 180° for 4 bolt.
INSPECT the torque
converter pilot outer
diameter to crankshaft pilot
inner diameter. REPAIR as
necessary. REFER to
Section 307 - 01 .
z Engine
vibration— is felt
with increases
and decreases in
engine rpm z
Strain on exhaust
mounts. z
CARRY OUT the Exhaust
System Neutralizing
procedure in this section.
REPAIR as necessary.
z Damaged or worn
powertrain/drivetrain
mounts. z
CHECK the
powertrain/drivetrain
mounts for damage.
REPAIR as necessary.
z Engine or
transmission
grounded to chassis. z
INSPECT the
powertrain/drivetrain for
correct clearances.
REPAIR as necessary.
z Engine
vibration—
vibration felt at all
times z
Excessive engine
pulley runout. z
CARRY OUT Engine
Accessory Test. INSTALL a
new engine pulley as
necessary. REFER to
Section 303 - 01A for 3.8L
engines or Section 303 - 01B
for 4.6L (2V) engines.
z Damaged or worn
accessory
component. z
CARRY OUT Engine
Accessory Test. REPAIR or
INSTALL a new component Klj . 27 ba
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as necessary.
z Accelerator pedal
vibration— felt
through the pedal
as a buzz z
Throttle cable loose
or misrouted. z
INSPECT the throttle cable.
REPAIR as necessary.
REFER to Section 310 - 02 .
z Engine
vibration— mostly
at coast/neutral
coast. Condition
improves with
vehicle
accelerating z
Combustion
instability. z
CHECK the ignition system.
INSTALL new components
as necessary.
z Engine vibration
or shudder—
occurs with light
to medium
acceleration
above 56 km/h
(35 mph) z
Worn or damaged
spark plugs. z
INSPECT the spark plugs
for cracks, high resistance
or broken insulator.
INSTALL a new spark plug
(s) as necessary.
z Plugged fuel injector. zREPAIR or INSTALL a new
injector as necessary.
REFER to Section 303 - 04A
for 3.8L engines or
Section 303 - 04B for 4.6L (2V)
engines.
z Damaged spark plug
wire. z
INSPECT the spark plug
wires for damage. INSTALL
a new spark plug wire(s) as
necessary.
z Contaminated fuel. zINSPECT the fuel for
contamination. DRAIN the
fuel system and refill.
z Worn or damaged
torque converter. z
CHECK the torque
converter. INSTALL a new
torque converter as
necessary. REFER to
Section 307 - 01 .
Symptom Chart—
Idle Noise/Vibration Condition
Possible Sources Action
z Idle air control (IAC)
valve moan — occurs
on throttle tip- out z
IAC valve is
contaminated
with oil. z
GO to Component Tests in
this section.
z Accessory drive belt
chirp — occurs at idle
or high idle, cold or
hot. Most common
occurrence is during
humid weather z
Accessory drive
belt worn, or
pulley is
misaligned or
loose. z
INSPECT for loose or
misaligned pulleys. CHECK
the drive belt for wear or
damage. INSTALL new
pulley(s)/drive belt, or
accessory drive components
as necessary. REFER to
Section 303 - 05 .
z Accessory drive
bearing hoot —
occurs at idle or high
idle in cold
temperatures of
approximately +4°C z
Accessory drive
idler or
tensioner pulley
bearing is
experiencing
stick/slip z
Go To Pinpoint Test C . Klj . 28 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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port. DISCARD the leaking
parts, and INSTALL a new
component.
z Vehicles with a
plastic intake
manifold. z
Acceptable condition. Some
plastic manifolds exhibit this
noise, which is the effect of
the plastic manifold.
z Automatic
transmission buzz or
hiss z
Incorrect
driveline
angles. z
CHECK for correct driveline
angles. REPAIR as
necessary. REFER to
Section 205 - 00 .
z Worn or
damaged main
control
solenoids or
valves. z
Using a transmission tester,
activate the solenoids to
duplicate sound. INSTALL
new components as
necessary. REFER to
Section 307 - 01 .
z Manual Transmission
Clutch throw- out
bearing whine. A
change in noise pitch
or loudness while
depressing the clutch
pedal z
Worn throw- out
bearing. z
INSTALL a new throw- out
bearing. REFER to Section 308 - 01 .
z Heating, vacuum and
air conditioning
(HVAC) system chirp
— most audible inside
the vehicle. Listen for
a change in noise
pitch or loudness
while changing the
HVAC system blower
speed z
Damaged or
worn HVAC
blower bearing. z
INSTALL a new blower
motor. REFER to Section 412 - 02 .
z Air conditioning (A/C)
clutch ticking —
occurs when the
compressor clutch
engages z
Acceptable
noise.
z Incorrect air
gap. z
LISTEN to the clutch to
determine if the noise occurs
with clutch engagement. A
small amount of noise is
acceptable. If the noise is
excessive, CHECK the A/C
clutch air gap. INSPECT the
A/C clutch for wear or
damage. INSTALL a new
clutch as necessary. REFER
to Section 412 - 03 .
z Intermittent rattle, or
scraping/rubbing
noise z
Loose exhaust
heat shield(s). z
INSPECT the exhaust
system for loose parts using
a glove or clamps to verify
cause. REPAIR as
necessary. REFER to
Section 309 - 00 .
z Wiring, hose or
other part
interfering with
accessory drive
belt or pulley. z
INSPECT accessory drive
system closely verifying
there is adequate clearance
to all rotating components.
REPAIR as necessary.
z Engine ticking or
knocking noise —
occurs during idle or z
Piston noise or
valvetrain noise
(bled down z
Go To Pinpoint Test G . Klj . 30 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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closing/opening
the window
z Squeak— heard
outside of vehicle
when
closing/opening
the door z
Exhaust shield
rubbing against
the chassis or
exhaust pipe. z
CHECK the exhaust system.
REPAIR as necessary. REFER
to Section 309 - 00 .
z Squeak— occurs
with initial brake
pedal application z
Disc brake pads. zUnder certain conditions,
asbestos free pads can
generate a squeak noise. This
noise is normal and does not
indicate a concern.
z Squeak— a
constant noise
that occurs with
brake pedal
applications z
Damaged or
worn disc brake
pads. z
INSPECT the pads for oil,
grease or brake fluid
contamination. CHECK for
glazed linings. A brake disc with
hard spots will also cause a
squeak type noise. REPAIR or
INSTALL new pads as
necessary. REFER to Section 206 - 03 for front disc brakes and
Section 206 - 04 for rear disc
brakes.
z Squeak— noise
occurs over
bumps or when
turning z
Worn control
arm bushings. z
INSPECT the control arm
bushings. Spray with lubricant
and CARRY OUT a "bounce
test" to determine which
bushing. REPAIR as necessary.
REFER to Section 204 - 01 .
z Worn or
damaged shock
absorber/strut. z
INSPECT the shock absorber
for damage. CARRY OUT a
"bounce test" to isolate the
noise. INSTALL a new shock
absorber/strut as necessary.
REFER to Section 204 - 01 for
the front shock absorber/strut or
Section 204 - 02 for the rear
shock absorber/strut.
z Rattle— heard
when
closing/opening
the door or
window z
Loose internal
door
mechanism,
bracket or
attachment. z
REPEAT the motion or CARRY
OUT a "tap test" to duplicate the
noise. INSPECT the door for
loose components. TIGHTEN
loose components or USE the
Rotunda Squeak and Rattle Kit
to isolate any rattling
components.
z Rattle — GT
models only,
noise occurs from
the rear of the
vehicle z
A loose or under
torqued shock
damper
attaching nut. z
VERIFY the torque on the
shock damper- to-axle nuts is 63
Nm (46 lb- ft). VERIFY the
torque for the shock damper- to-
rail bracket nuts is 90 Nm (66
lb- ft). Do not over torque.
TIGHTEN as necessary.
z Squeak or rattle—
heard inside the
vehicle over rough
roads/bumps z
Misaligned glove
compartment
door/hinge. z
ALIGN the glove compartment
door.
z Instrument panel
trim loose or z
INSPECT the instrument panel
trim for missing or loose clips or Klj . 32 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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z
Clunk— noise from the
front suspension, occurs
in and out of turns z
Loose front
struts or shocks. z
INSPECT for loose nuts
or bolts. TIGHTEN to
specifications. REFER to
Section 204 - 01 .
z Clunk— noise from the
rear suspension, occurs
when shifting from
reverse to drive z
Loose rear
suspension
components. z
INSPECT for loose or
damaged rear
suspension components.
REPAIR or INSTALL
new components as
necessary. REFER to
Section 204 - 02 .
z Click or pop— noise from
the front suspension.
More noticeable over
rough roads or over
bumps z
Worn or
damaged ball
joints. z
CARRY OUT a ball joint
inspection. INSTALL
new ball joints or control
arms as necessary.
REFER to Section 204 -
01 .
z Click or pop (FWD
vehicles)—noise occurs
when vehicle is turning z
Worn or
damaged ball
joints. z
CARRY OUT a ball joint
inspection. INSTALL
new ball joints or control
arms as necessary.
z Click or snap— occurs
when accelerating around
a corner z
Damaged or
worn outboard
CV joint. z
INSPECT the outboard
CV joint and boot.
REPAIR or INSTALL a
new CV joint as
necessary.
z Front suspension noise—
a squeak, creak or rattle
noise. Occurs mostly over
bumps or rough roads z
Steering
components.
z Loose or bent
front struts or
shock
absorbers.
z Damaged
spring or spring
mounts.
z Damaged or
worn
control/radius
arm bushings.
z Worn or
damaged
stabilizer bar
bushings or
links. z
Go To Pinpoint Test H .
z Rear suspension noise—
a squeak, creak or rattle
noise. Occurs mostly over
bumps or rough roads z
Loose or bent
rear shock
absorbers.
z Damaged
spring or spring
mounts.
z Damaged or
worn control
arm bushings.
z Worn or
damaged
stabilizer bar
bushings or
links. z
Go To Pinpoint Test I .
z Shudder— occurs during zRear drive axle zCHECK the axle mounts Klj . 37 ba
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