2003 FORD MUSTANG valve lash adjuster

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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z
Is the ticking noise gone? CHECK for TSB for applicable vehicle.
REPAIR as necessary. TEST the system
for normal operation.
No
GO to
B2 .
B2 CHECK FOR TICKING NOISE AT THE FUEL
INJECTOR z
Using an EngineEAR, listen at the fuel
injectors by placing a probe on each injector.
To isolate the faulty injector, disconnect the
injector electrical connector and listen for the
noise.
z Is the fuel injector the source of the ticking
noise? Yes
INSTALL a new fuel injector. REFER to
Section 303
- 04A for 3.8L engines or
Section 303 - 04B for 4.6L (2V) engines.
TEST the system for normal operation.
No
GO to B3 .
B3 CHECK THE BELT TENSIONER FOR TICKING
NOISE z
Inspect the accessory drive. Check for the belt
tensioner bottoming at end of travel or not at
end of stroke.
z Using an EngineEAR, listen at the belt
tensioner.
z Is the belt tensioner the source of the
noise? Yes
INSTALL a new belt tensioner. TEST the
system for normal operation.
No
GO to
B4 .
B4 CHECK THE WATER PUMP FOR TICKING
NOISE z
Using an EngineEAR, listen at the water pump
for ticking noise.
z Is the water pump the source of the noise? Yes
INSTALL a new water pump. REFER to
Section 303
- 03A . TEST the system for
normal operation.
No
GO to B5 .
B5 CHECK FOR AN OBSTRUCTION OF THE
COOLING FAN z
Inspect the cooling fan for obstructions.
z Check the cooling fan and shroud for wear or
damage.
z Was there an obstruction or does the
cooling fan show signs of damage? Yes
REPAIR or INSTALL a new cooling fan.
REFER to
Section 303 - 03A . TEST the
system for normal operation.
No
GO to B6 .
B6 CHECK THE OIL PUMP FOR TICKING NOISE
z
Check the oil pump using EngineEARs and
probe at the oil filter adapter to verify the oil
pump as a source.
z Is the oil pump the source of the noise? Yes
INSTALL a new oil pump. REFER to
Section 303
- 01A for 3.8L engines or
Section 303 - 01B for 4.6L (2V) engines.
TEST the system for normal operation.
No
GO to B7 .
B7 CHECK VALVE LIFTERS OR LASH
ADJUSTERS FOR CORRECT OPERATION z
Check valve lifter/lash adjuster for correct
operation, using EngineEARs.
z Are the valve lifters/lash adjusters Yes
VERIFY customer concern. CONDUCT a
diagnosis of other suspect components. Klj . 50 ba
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PINPOINT TEST C: ACCESSORY DRIVE BEARING HOOT
PINPOINT TEST D: POWER STEERING MOAN
PINPOINT TEST E: ENGINE DRIVEN COOLING FAN MOAN operating correctly?
No
INSTALL a new valve lifter/lash adjuster
(s). TEST the system for normal
operation.
Test Step Result / Action to Take
C1 CHECK THE IDLER AND TENSIONER
PULLEY BEARINGS z
Carry out the Vehicle Cold Soak
Procedure in this section.
z Key in START position.
z Place an EngineEAR probe directly on the
pulley center post or bolt to verify which
bearing is making the noise.
z Key in OFF position.
z Is either bearing making the noise? Yes
INSTALL a new pulley/idler. CARRY OUT the
Vehicle Cold Soak Procedure and TEST the
system for normal operation.
No
CONDUCT a diagnosis on other suspect
accessory drive components.
Test Step Result / Action to Take
D1 CHECK THE POWER STEERING
SYSTEM z
Carry out the Vehicle Cold Soak
Procedure in this section.
z Key in START position.
z Turn the steering wheel while the noise
is occurring and listen for changes in
sound pitch or loudness.
z Key in OFF position.
z Does the sound pitch or loudness
change while turning the steering
wheel? Yes
GO to
D2 .
No
CONDUCT a diagnosis on other suspect
accessory drive components. D2 VERIFY THE SOURCE
z
Key in START position.
z Place an EngineEAR probe near the
power steering pump/reservoir while the
noise is occurring. While an assistant
turns the steering wheel, listen for
changes in sound pitch or loudness.
z Key in OFF position.
z Does the sound pitch or loudness
change while turning the steering
wheel? Yes
VERIFY that the supply tube to the pump is
unobstructed. CHECK the fluid condition and
level. DRAIN the fluid and REFILL. CARRY
OUT the Vehicle Cold Soak Procedure and
TEST the system for normal operation. REFER
to Section 211
- 02 .
No
Normal system operation. Test Step Result / Action to Take
E1 CHECK THE ENGINE DRIVEN COOLING
FAN AFTER A COLD SOAK Klj . 51 ba
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REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
z Damaged charging
system/battery. z
REFER to Section 414 - 00 .
z Burnt valve. zINSTALL a new valve.
z Worn piston. zINSTALL a new piston.
z Worn piston rings. zINSTALL new piston rings.
z Worn cylinder. zREPAIR or INSTALL a new
cylinder block.
z Damaged head
gasket. z
INSTALL a new head gasket.
z Damaged cooling
system. z
Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
z Poor idling zVacuum leaks. zRefer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
z Malfunctioning or
damaged ignition
system. z
Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
z Malfunctioning or
damaged fuel
system. z
Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
z Damaged valve
tappet or lash
adjuster. z
INSTALL a new valve tappet or
lash adjuster.
z Damaged valve
tappet guide or lash
adjuster. z
INSTALL a new valve tappet
guide or valve tappet.
z Incorrect valve-to-
valve seat contact. z
REPAIR or INSTALL a new
valve or valve seat.
z Damaged head
gasket. z
INSTALL a new head gasket.
z Abnormal
combustion z
Malfunctioning or
damaged fuel
system. z
Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
z Malfunctioning or
damaged ignition
system. z
Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
z Malfunctioning or
damaged air intake
system. z
Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis Klj . 3 ba
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(PC/ED) manual.
z Damaged valve
tappet or lash
adjuster. z
INSTALL a new valve tappet or
lash adjuster.
z Damaged valve
tappet guide or
valve tappet. z
INSTALL a new valve tappet
guide or valve tappet.
z Burnt or sticking
valve. z
REPAIR or INSTALL a new
valve.
z Weak or broken
valve spring. z
INSTALL a new valve spring.
z Carbon
accumulation in
combustion
chamber. z
ELIMINATE carbon buildup.
z Excessive oil
consumption z
Leaking oil. zREPAIR oil leakage.
z Malfunctioning PCV
system. z
REPAIR or INSTALL new
necessary components.
z Worn valve stem
seal. z
INSTALL a new valve stem seal.
z Worn valve stem or
valve guide. z
INSTALL a new valve and valve
guide.
z Sticking piston
rings. z
REPAIR or INSTALL new piston
rings.
z Worn piston ring
groove. z
INSTALL a new piston and
piston pin.
z Worn piston or
cylinder. z
REPAIR or INSTALL a new
piston or cylinder block.
z Engine noise zLeaking exhaust
system. z
REPAIR exhaust leakage.
z Incorrect drive belt
tension. z
REFER to Section 303 - 05 .
z Malfunctioning
generator bearing. z
Refer to the appropriate section
in Group 414 for the procedure.
z Malfunctioning
water pump
bearing. z
REFER to Section 303 - 03A .
z Malfunctioning or
damaged cooling
system. z
REFER to Section 303 - 03A .
z Malfunctioning or
damaged fuel
system. z
Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
z Loose timing
chain/belt (6268). z
ADJUST or INSTALL a new
timing chain/belt.
z Damaged timing
chain tensioner
(6L266). z
INSTALL a new timing chain
tensioner.
z Excessive main
bearing clearance. z
ADJUST clearance or INSTALL
a new crankshaft main bearing
(6333). Klj . 4 ba
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z
Seized or heat
damaged
crankshaft main
bearing. z
INSTALL a new crankshaft main
bearing.
z Excessive
crankshaft end
play. z
INSTALL a new thrust bearing or
crankshaft (6303).
z Excessive
connecting rod
bearing clearance. z
INSTALL a new connecting rod
bearing or connecting rod
(6200).
z Heat damaged
connecting rod
bearing (6211). z
INSTALL a new connecting rod
bearing.
z Damaged
connecting rod
bushing (6207). z
INSTALL a new connecting rod
bushing.
z Worn cylinder. zREPAIR or INSTALL a new
cylinder block (6010).
z Worn piston (6108)
or piston pin
(6135). z
INSTALL a new piston or piston
pin.
z Damaged piston
rings. z
INSTALL new piston rings.
z Bent connecting
rod. z
INSTALL a new connecting rod.
z Malfunctioning
valve tappet (6500)
or lash adjuster. z
INSTALL a new valve tappet or
lash adjuster.
z Excessive valve
tappet or lash
adjuster clearance. z
ADJUST clearance or INSTALL
a new valve tappet guide or
valve tappet.
z Broken valve spring
(6513). z
INSTALL a new valve spring.
z Excessive valve
guide clearance. z
ADJUST clearance or INSTALL
a new valve guide (6510) or
valve.
z Insufficient
power z
Malfunctioning or
damaged ignition
system. z
Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
z Malfunctioning or
damaged fuel
system. z
Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
z Malfunctioning or
damaged air intake
system. z
Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
z Damaged or
plugged exhaust
system. z
INSPECT exhaust system.
z Incorrect tire size. zREFER to Section 204 - 04 .
z Dragging brakes. zREFER to Section 206 - 00 . Klj . 5 ba
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Component Tests
Engine Oil Leaks
NOTE:
When diagnosing engine oil leaks, the source and location of the leak must be positively
identified prior to repair.
Prior to carrying out this procedure, clean all sealing surface areas with a suitable solvent to remove all
traces of oil.
Engine Oil Leaks— Fluorescent Oil Additive Method
Use the UV Leak Detector Kit to carry out the following procedure for oil leak diagnosis. 1. Add gasoline engine oil dye. Use a minimum 14.8 ml (0.5 ounce) to a maximum 29.6 ml (1 ounce) of fluorescent additive to all engines. If the oil is not premixed, fluorescent additive must
first be added to crankcase.
2. Run the engine for 15 minutes. Stop the engine and inspect all seal and gasket areas for leaks using the UV Leak Detector Kit. A clear bright yellow or orange area will identify the leak. For
extremely small leaks, several hours may be required for the leak to appear.
Leakage Points— Underhood
Examine the following areas for oil leakage:
zvalve cover gaskets z
Slipping
transmission. z
Refer to the appropriate section
in Group 307 for the procedure.
z Malfunctioning
valve tappet or lash
adjuster. z
INSTALL a new valve tappet or
lash adjuster.
z Damaged valve
tappet guide or
valve tappet. z
INSTALL a new valve tappet
guide or valve tappet.
z Compression
leakage at valve
seat. z
REPAIR or INSTALL a new
valve, valve seat or cylinder
head (6049).
z Seized valve stem. zINSTALL a new valve.
z Weak or broken
valve spring. z
INSTALL a new valve spring.
z Worn or damaged
camshaft. z
INSTALL a new camshaft.
z Damaged head
gasket (6051). z
INSTALL a new head gasket.
z Cracked or
distorted cylinder
head. z
INSTALL a new cylinder head.
z Damaged, worn or
sticking piston ring
(s). z
REPAIR or INSTALL a new
piston ring(s).
z Worn or damaged
piston. z
INSTALL a new piston and
piston pin. Klj . 6 ba
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4. WORN RINGS OR DILUTED OIL: When the engine is accelerated (dotted needle), the needle
drops to 0 kPa (0 in- Hg). Upon deceleration, the needle runs slightly above 74 kPa (22 in- Hg).
5. STICKING VALVES: When the needle (dotted) remains steady at a normal vacuum but occasionally flicks (sharp, fast movement) down and back about 13 kPa (4 in- Hg), one or more
valves may be sticking.
6. BURNED OR WARPED VALVES: A regular, evenly- spaced, downscale flicking of the needle
indicates one or more burned or warped valves. Insufficient hydraulic lash adjuster or hydraulic
lash adjuster (HLA) clearance will also cause this reaction.
7. POOR VALVE SEATING: A small but regular downscale flicking can mean one or more valves are not seating.
8. WORN VALVE GUIDES: When the needle oscillates over about a 13 kPa (4 in- Hg) range at idle
speed, the valve guides could be worn. As engine speed increases, the needle will become
steady if guides are responsible.
9. WEAK VALVE SPRINGS: When the needle oscillation becomes more violent as engine rpm is increased, weak valve springs are indicated. The reading at idle could be relatively steady.
10. LATE VALVE TIMING: A steady but low reading could be caused by late valve timing.
11. IGNITION TIMING RETARDING: Retarded ignition timing will produce a steady but somewhat low reading.
12. INSUFFICIENT SPARK PLUG GAP: When spark plugs are gapped too close, a regular, small pulsation of the needle can occur.
13. INTAKE LEAK: A low, steady reading can be caused by an intake manifold or throttle body gasket leak.
14. BLOWN HEAD GASKET: A regular drop of fair magnitude can be caused by a blown head gasket or warped cylinder head- to-cylinder block surface.
15. RESTRICTED EXHAUST SYSTEM: When the engine is first started and is idled, the reading may be normal, but as the engine rpm is increased, the back pressure caused by a clogged
muffler (5230), kinked tail pipe or other concerns will cause the needle to slowly drop to 0 kPa
(0 in-Hg). The needle then may slowly rise. Excessive exhaust clogging will cause the needle to
drop to a low point even if the engine is only idling.
16. When vacuum leaks are indicated, search out and correct the cause. Excess air leaking into the system will upset the fuel mixture and cause concerns such as rough idle, missing on
acceleration or burned valves. If the leak exists in an accessory unit such as the power brake
booster (2005), the unit will not function correctly. Always fix vacuum leaks.
Excessive Engine Oil Consumption
The amount of oil an engine uses will vary with the way the vehicle is driven in addition to normal
engine- to-engine variation. This is especially true during the first 16,100 km (10,000 miles) when a new
engine is being broken in or until certain internal engine components become conditioned. Vehicles
used in heavy- duty operation may use more oil. The following are examples of heavy- duty operation:
z trailer towing applications
z severe loading applications
z sustained high speed operation Klj . 12 ba
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