Ford 2003 Mustang Workshop Manual page 71

noise—normally
accompanied by
vibration
Whistling noise—
normally
accompanied
with poor idle
condition
Clunking noise
Pinging noise
Knocking noise—
light knocking
noise, also
Damaged or
misaligned exhaust
system.
Air intake system.
Water pump has
excessive end play or
imbalance.
Generator has
excessive end play.
Exhaust system leak.
Gasoline octane too
low.
Knock sensor
operation.
Incorrect spark
timing.
High operating
temperature.
Foul-out spark plug.
Catalytic converter.
Excessive clearance
between the piston
and the cylinder wall.
Powertrain/Drivetrain
Mount Neutralizing in this
section.
INSPECT the exhaust
system for loose or broken
clamps and brackets.
CARRY OUT Exhaust
System Neutralizing in this
section.
CHECK 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
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 .
CHECK the generator for
excessive end play.
REPAIR or INSTALL a new
generator. REFER to
Section 414-02 .
INSPECT the exhaust
system for leaks. REPAIR
as necessary.
VERIFY with customer the
type of gasoline used.
CORRECT as necessary.
CHECK the knock sensor.
INSTALL a new knock
sensor as necessary.
REFER to Section 303-14
CHECK the spark timing.
REPAIR as necessary.
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.
CHECK the spark plugs.
REPAIR or INSTALL new
spark plugs as necessary.
Acceptable noise.
Engine cold and at high
idle. Using an EngineEAR,
pull a spark plug or fuel
.