Toyota All Models Replacement Manual

TROUBLESHOOTING

CONDITION
Engine runs rough or will not run: Check the ignition wires
or coil packs for proper
connection to the spark plugs.
Check the ignition wires or coil
packs for proper connection
to cylinders.
There is a loud hissing noise: One or more spark plugs have
been improperly tightened –
re-check.
One or more spark plugs
may have double washers –
re-check.
Spark plug may have been
cross-threaded – re-install.
If noise persists or if the threads
in the engine head are stripped,
DO NOT DRIVE THE VEHICLE –
have it towed to your Toyota
Dealer Service Department for
diagnosis and repair.
There is a very loud clicking or A foreign object may have fallen
tapping noise: into one of the cylinders. If the
noise persists, DO NOT DRIVE
THE VEHICLE – have it towed
to your Toyota Dealer Service
Department for diagnosis
and repair.
Engine has poor performance, The incorrect plugs may have
runs hot or overheats: been installed – re-check.
The spark plug gap may be
incorrect – re-check.
One or more ignition wires may
have been damaged.
If the problem persists, take
the vehicle to your Toyota
Dealer Service Department for
diagnosis and repair. DO NOT
DRIVE THE VEHICLE if the
engine overheats.
The "Check Engine" light Take the vehicle to your Toyota
comes on: Dealer Service Department for
diagnosis and repair.
REFERENCES
Please refer to the following sources for additional information:
ACTION
• Your vehicle's Owner's Manual
• Your vehicle's Repair Manual
• Genuine Toyota Spark Plugs Brochure (Available in English and
Spanish)
CAUTION
Moving parts like the fan blade and drive belts, as well as extreme
heat in the engine compartment or from the exhaust system can
result in serious injury.
• Approach with caution and care.
• Never take shortcuts when replacing parts.
• Improper servicing may damage your Toyota and lead to
personal injury.
• Unless you have proper knowledge, equipment and tools, you
should have your Toyota Dealer Service Department perform
the repairs and maintenance.
IMPORTANT SAFETY NOTICE
Proper installation of Genuine Toyota replacement parts is essential
for the safe and reliable operation of your vehicle.
Following these instructions will:
• Help to assure your personal safety
• Assist you in the proper replacement of specific parts
There are many variations in the step-by-step procedures used in
installing various parts, and varying skill levels of individuals doing
the parts replacement. These instructions cannot anticipate all
circumstances or provide advice and caution on each. If you are
in doubt concerning your ability to replace the part or have any
questions, consult your local Toyota Dealer Service Department
and have the work performed by an experienced technician.
For further assistance, contact your Toyota dealer.
Visit our Web site at www.toyota.com
M/N 00405-HOWTO-SPLUG