Ford 2003 Mustang Workshop Manual page 74

Rattling noise—
from the bottom
of the vehicle
Thumping
noise—from the
bottom of the
vehicle, worse at
acceleration
Whoosh—occurs
during light
vehicle
acceleration.
Heard inside the
vehicle
Engine
vibration—
increases
intensity as
engine rpm is
increased
Engine
vibration—is felt
with increases
and decreases in
engine rpm
Engine
vibration—
vibration felt at all
times
Excessive runout of
valve seats on the
valve face.
Loose muffler shields
or catalytic converter
shields.
Exhaust pipe/muffler
grounded to chassis.
Throttling late,
creating turbulence
transmitted through
the plastic manifold.
Engine out-of-
balance.
Strain on exhaust
mounts.
Damaged or worn
powertrain/drivetrain
mounts.
Engine or
transmission
grounded to chassis.
Excessive engine
pulley runout.
Damaged or worn
accessory
component.
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.
CHECK the exhaust
system for loose exhaust
shields. REPAIR as
necessary.
CHECK the exhaust
system to chassis
clearance. CHECK the
exhaust system hangers for
damage. REPAIR as
necessary. REFER to
Section 309-00 .
CHECK for leaks or
missing seal in the dash
panel.
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 .
CARRY OUT the Exhaust
System Neutralizing
procedure in this section.
REPAIR as necessary.
CHECK the
powertrain/drivetrain
mounts for damage.
REPAIR as necessary.
INSPECT the
powertrain/drivetrain for
correct clearances.
REPAIR as necessary.
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.
CARRY OUT Engine
Accessory Test. REPAIR or
INSTALL a new component