engine FORD MUSTANG 2003 Owner's Guide

„
Loudness proportional to vehicle speed. Low- frequency noise at high
speeds, noise and loudness increase with speed. GO to Symptom Chart —
Driveline Noise/Vibration .
„ A low- pitched noise (drumming). GO to Symptom Chart — Engine
Noise/Vibration .
„ Vibration occurs at a particular speed (mph) regardless of acceleration or
deceleration. GO to Symptom Chart — Tire Noise/Vibration .
„ Noise varies with wind/vehicle speed and direction. GO to Symptom Chart — Air Leak and Wind Noise .
„ Related to engine speed.
„Noise varies with engine rpm. GO to Symptom Chart — Engine
Noise/Vibration .
„ Vibration occurs at a particular speed (mph) regardless of engine speed
(rpm).
2. Acceleration
„Wide open throttle (WOT)
„Engine induced contact between components. Inspect and repair as
necessary.
„ Noise is continuous throughout WOT. Exhaust system or engine ground
out. GO to Symptom Chart — Engine Noise/Vibration .
„ Light/moderate acceleration
„Tip- in moan. Engine/exhaust noise. GO to Symptom Chart — Engine
Noise/Vibration .
„ Knock-type noise. GO to Symptom Chart — Engine Noise/Vibration .
„ Driveline shudder. GO to Symptom Chart — Driveline Noise/Vibration .
„ Engine vibration. GO to Symptom Chart — Engine Noise/Vibration .
3. Turning noise. GO to Symptom Chart — Steering Noise/Vibration .
4. Braking
„Clicking sound is signaling ABS is active. Acceptable ABS sound.
„ A continuous grinding/squeal. GO to Symptom Chart — Brake Noise/Vibration .
„ Brake vibration/shudder. GO to Symptom Chart — Brake Noise/Vibration .
5. Clutching
„A noise occurring during clutch operation. GO to Symptom Chart — Transmission
(Manual) and Transfer Case Noise/Vibration .
„ Vibration. GO to Symptom Chart — Transmission (Manual) and Transfer Case
Noise/Vibration .
6. Shifting
„Noise or vibration condition related to the transmission (automatic). GO to
Symptom Chart — Transmission (Automatic) Noise/Vibration .
„ Noise or vibration related to the transmission (manual). GO to Symptom Chart —
Transmission (Manual) and Transfer Case Noise/Vibration .
7. Engaged in four- wheel drive. GO to Symptom Chart — Transmission (Manual) and
Transfer Case Noise/Vibration .
8. Cruising speeds
„Accelerator pedal vibration. GO to Symptom Chart — Engine Noise/Vibration .
„ Driveline vibration. GO to Symptom Chart — Driveline Noise/Vibration .
„ A shimmy or shake. GO to Symptom Chart — Tire Noise/Vibration .
9. Driving at low/medium speeds Klj . 11 ba
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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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CARRY OUT a driveline
vibration test. REFER to
Section 205
- 00 . REPAIR as
necessary.
z Binding or
damaged
splines on the
driveshaft slip-
yoke. z
CLEAN and INSPECT the
splines of the slip- yoke,
driveshaft and coupling
shaft for wear or damage.
INSTALL a new slip- yoke or
driveshaft assembly as
necessary. REFER to
Section 205 - 01 . REPAIR as
necessary.
z Driveshaft
runout. z
CARRY OUT a Runout
Check. REFER to Section 205 - 00 . REPAIR as
necessary.
z Incorrect lateral
and radial
tire/wheel
runout. z
INSPECT the tire and
wheels. MEASURE tire
runouts. REPAIR or
INSTALL new components
as necessary. REFER to
Section 204 - 04 .
z Driveline angles
out of
specification. z
CHECK for correct driveline
angles. REPAIR as
necessary. REFER to
Section 205 - 00 .
z Incorrectly
seated CV joint
in the front
wheel hub. z
CHECK the outer CV joint
for correct seating into the
hub. REPAIR as necessary. Symptom Chart —
Engine Noise/Vibration Condition
Possible Sources Action
z Grinding noise—
occurs during
engine cranking z
Incorrect starter
motor mounting. z
INSPECT the starter motor
for correct mounting.
REPAIR as necessary.
REFER to Section 303 - 06 .
z Starter motor. zCHECK the starter motor.
REPAIR or INSTALL a new
starter motor as necessary.
REFER to Section 303 - 06 .
z Incorrect starter
motor drive
engagement. z
INSPECT the starter motor
drive and flexplate/flywheel
for wear or damage.
INSTALL a new starter
motor drive or flywheel as
necessary. REFER to
Section 303 - 06 .
z Engine ticking
noise z
Fuel injector.
z Fuel line.
z Oil pump.
z Valve lifter.
z Belt tensioner.
z Water pump.
z Obstruction of cooling
fan. z
Go To Pinpoint Test B .
z Engine drumming zPowertrain mount. zCARRY OUT Klj . 23 ba
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noise—
normally
accompanied by
vibration Powertrain/Drivetrain Mount Neutralizing in this
section.
z Damaged or
misaligned exhaust
system. z
INSPECT the exhaust
system for loose or broken
clamps and brackets.
CARRY OUT Exhaust System Neutralizing in this
section.
z Whistling noise—
normally
accompanied
with poor idle
condition z
Air intake system. zCHECK the air intake
ducts, air cleaner, throttle
body and vacuum hoses for
leaks and correct fit.
REPAIR or ADJUST as
necessary. REFER to
Section 303 - 12
z
Clunking noise zWater pump has
excessive end play or
imbalance. z
CHECK the water pump for
excessive end play.
INSPECT the water pump
with the drive belt off for
imbalance. INSTALL a new
water pump as necessary.
REFER to Section 303 -
03A .
z Generator has
excessive end play. z
CHECK the generator for
excessive end play.
REPAIR or INSTALL a new
generator. REFER to
Section 414 - 02 .
z Pinging noise zExhaust system leak. zINSPECT the exhaust
system for leaks. REPAIR
as necessary.
z Gasoline octane too
low. z
VERIFY with customer the
type of gasoline used.
CORRECT as necessary.
z Knock sensor
operation. z
CHECK the knock sensor.
INSTALL a new knock
sensor as necessary.
REFER to Section 303 - 14 .
z Incorrect spark
timing. z
CHECK the spark timing.
REPAIR as necessary.
z High operating
temperature. z
INSPECT cooling system
for leaks. CHECK the
coolant level. REFILL as
necessary. CHECK the
coolant for the correct mix
ratio. DRAIN and REFILL
as needed. CHECK engine
operating temperature is
within specifications.
REPAIR as necessary.
z Foul- out spark plug. zCHECK the spark plugs.
REPAIR or INSTALL new
spark plugs as necessary.
z Catalytic converter. zAcceptable noise.
z Knocking noise—
light knocking
noise, also z
Excessive clearance
between the piston
and the cylinder wall. z
Engine cold and at high
idle. Using an EngineEAR,
pull a spark plug or fuel Klj . 24 ba
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described as
piston slap. Noise
is most
noticeable when
engine is cold
with light to
medium
acceleration.
Noise disappears
as engine warms
injector connector until the
noise goes away. CARRY
OUT a cylinder bore
clearance to piston check.
INSTALL a new piston.
REFER to
Section 303 - 01A
for 3.8L engines or
Section 303 - 01B for 4.6L (2V)
engines.
z Knocking noise—
light double
knock or sharp
rap sound.
Occurs mostly
with warm engine
at idle or low
speeds in DRIVE.
Increases in
relation to engine
load. Associated
with poor
lubrication history z
Excessive clearance
between the piston
and the piston pin. z
INSTALL a new piston or
piston pin. REFER to
Section 303 - 01A for 3.8L
engines or Section 303 - 01B
for 4.6L (2V) engines.
z Knocking noise—
light knocking
noise is most
noticeable when
engine is warm.
Noise tends to
decrease when
vehicle is
coasting or in
neutral z
Excessive clearance
between the
connecting rod
bearings and the
crankshaft. z
Engine warm and at idle.
Using an EngineEAR,
PULL a spark plug or fuel
injector connector until the
noise goes away. INSTALL
new bearings. REFER to
Section 303 - 01A for 3.8L
engines or Section 303 - 01B
for 4.6L (2V) engines.
z Knocking— deep
knocking noise.
Noise is most
noticeable when
engine is warm,
at lower rpm and
under a light load
and then at float z
Worn or damaged
crankshaft main
bearings. z
CARRY OUT DERU test.
CHECK for noise with
vehicle at operating
temperature, during
medium to heavy
acceleration. CHECK at
idle with injector
disconnected, noise does
not change. INSTALL new
main bearings. REFER to
Section 303 - 01A for 3.8L
engines or Section 303 - 01B
for 4.6L (2V) engines.
z Knocking noise—
occurs mostly
with warm engine
at light/medium
acceleration z
Spark plugs. zCHECK the spark plug for
damage or wear. INSTALL
new spark plugs as
necessary.
z Carbon accumulation
in combustion
chamber. z
REMOVE carbon from
combustion chamber.
z Whine or
moaning noise z
Air intake system. zCHECK the air cleaner and
ducts for correct fit.
INSPECT the air intake
system for leaks or
damage. REPAIR as
necessary. Klj . 25 ba
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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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