Ford 2003 Mustang Workshop Manual page 100

PINPOINT TEST G: ENGINE TICKING, KNOCKING OR CONTINUOUS
RATTLE
G1 CHECK FOR NOISE AT THE VALVE COVERS
AND THE FRONT COVERS (OHC ENGINES)
Carry out the Vehicle Cold Soak Procedure in
this section.
Key in START position.
NOTE: For a short-duration ticking noise,
multiple engine starts may be necessary.
Using an EngineEAR, listen closely at the valve
covers and the front covers (OHC engines) by
placing the probe near the surface of the valve
cover and then on the surface front cover.
Key in OFF position.
Is the noise source apparent?
G2 CHECK FOR NOISE AT THE CYLINDER
BLOCK
Key in START position.
Using an EngineEAR, listen closely at the
cylinder block by placing a probe on or near
each freeze plug.
Key in OFF position.
Is the noise source apparent?
G3 CHECK FOR NOISE WHILE DISCONNECTING
EACH FUEL INJECTOR ELECTRICAL
CONNECTOR, ONE AT A TIME
Key in START position.
Disconnect each fuel injector electrical
connector, one at a time, to decrease piston
force and listen for the noise.
Key in OFF position.
Is the noise reduced or eliminated?
PINPOINT TEST H: FRONT SUSPENSION NOISE
H1 ROAD TEST THE VEHICLE
Test drive the vehicle.
NOTE: An assistant will be needed for this road test.
During the road test, drive the vehicle over a rough road.
Using ChassisEARs, determine from which
area/component the noise is originating.
Is there a squeak, creak or rattle noise?
H2 INSPECT THE STEERING SYSTEM
Test Step
Test Step
CONDUCT diagnosis of
other suspect components.
Result / Action to Take
Yes
REMOVE the appropriate cover and
INSPECT for loose, worn/broken
components. REPAIR as necessary.
TEST the system for normal operation.
No
GO to G2 .
Yes
REPAIR or INSTALL new components
as necessary.
No
GO to G3 .
Yes
INSTALL a new fuel injector. TEST the
system for normal operation.
No
INSPECT accessory drive system or the
transmission as a possible source.
Result / Action to Take
Yes
GO to H2 .
No
The suspension system is
OK. CONDUCT a diagnosis
on other suspect systems.
Yes