Ford Thunderbird Manual page 5

03-oo-4
DIAGNOSIS AND TESTING (Continued)
Symptom Chart
Condition
•
Difficult Starting
•
Poor Idling
•
Abnormal Combustion
•
Excessive Oil Consumption
3 Can be purchased as a separate item.
Engine-Service
ENGINE DIAGNOSIS
Possible Source
•
Damaged starting system .
•
Damaged charger system
battery.
•
Damaged fuel system.
•
Damaged ignition system.
•
Burnt valve.
•
Worn piston.
•
Worn piston ring(s).
•
Worn cylinder.
•
Damaged cylinder head gasket .
•
Damaged fuel system.
•
Incorrect cam timing.
•
Damaged ignition system.
•
Damaged hydraulic valve tappet .
•
Worn valve stem guide .
•
Improper valve-to-valve seat
contact.
•
Damaged cylinder head gasket.
•
Leaking intake manifold gasket .
•
Damaged fuel system.
•
Restricted, plugged induction
system.
•
Damaged ignition system.
•
Damaged hydraulic valve tappet.
•
Worn valve stem guide.
•
Burnt or sticking valve .
•
Weak or broken valve spring .
•
Carbon accumulation in
combustion chamber.
•
Leaking intake manifold gasket.
•
Leaking oil .
•
Plugged or restricted air intake
system.
•
Worn piston ring groove.
•
Sticking piston ring(s).
•
Worn piston or cylinder.
•
Worn valve stem seal.
•
Worn valve stem or valve guide.
•
REFER to Section 03-06.
•
I
REFER to Section 14-00.
•
REFER to the Powertrain
Control/ Emissions Diagnosis
Manual3•
•
REFER to the Powertrain
Control / Emissions Diagnosis
Manual3•
•
REPLACE valve .
•
REPLACE piston .
•
REPLACE piston ring(s) .
•
SERVICE or REPLACE cylinder
blocks.
•
REPLACE cylinder head gasket.
•
REFER to the Powertrain
Control / Emissions Diagnosis
Manual3•
•
REFER to the Powertrain
Control / Emissions Diagnosis
Manual3•
•
REPLACE hydraulic valve tappet.
•
REPLACE valve stem guide.
•
REPLACE valve and
•
REPLACE cylinder head gasket .
•
REPLACE intake manifold gasket.
•
REFER to the Powertrain
Control/ Emissions Diagnosis
Manual3•
•
REFER to the Powertrain
Control / Emissions Diagnosis
Manual3•
•
REPLACE hydraulic valve tappet.
•
REPLACE valve stem guide.
•
SERVICE or REPLACE valve.
•
REPLACE valve spring.
•
ELIMINATE carbon buildup.
•
REPLACE intake manifold gasket.
•
SERVICE oil leakage.
•
SERVICE intake air system as
required.
•
REPLACE piston .
•
SERVICE or REPLACE piston
ring(s).
•
SERVICE or replace piston or
cylinder blocks.
•
REPLACE valve stem seal.
•
REPLACE valve and guide .
1997 Thunderbird, Cougar July 1996
Action
I
or valve seat.