SparkPlugsHowToBroch(New).

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TROUBLESHOOTING REFERENCES
CONDITION ACTION Please refer to the following sources for additional information:
• Your vehicle’s Owner’s Manual
Engine runs rough or will not run: Check the ignition wires
or coil packs for proper • Your vehicle’s Repair Manual
connection to the spark plugs. • Genuine Toyota Spark Plugs Brochure (Available in English and
Spanish)
Check the ignition wires or coil
packs for proper connection
to cylinders. CAUTION
There is a loud hissing noise: One or more spark plugs have Moving parts like the fan blade and drive belts, as well as extreme
been improperly tightened – heat in the engine compartment or from the exhaust system can
re-check. result in serious injury.

One or more spark plugs • Approach with caution and care.

may have double washers – • Never take shortcuts when replacing parts.
re-check. • Improper servicing may damage your Toyota and lead to
personal injury.
Spark plug may have been • Unless you have proper knowledge, equipment and tools, you
cross-threaded – re-install. should have your Toyota Dealer Service Department perform
the repairs and maintenance.
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
IMPORTANT SAFETY NOTICE
diagnosis and repair. Proper installation of Genuine Toyota replacement parts is essential
for the safe and reliable operation of your vehicle.
There is a very loud clicking or A foreign object may have fallen
tapping noise: into one of the cylinders. If the Following these instructions will:
noise persists, DO NOT DRIVE
THE VEHICLE – have it towed • Help to assure your personal safety
to your Toyota Dealer Service • Assist you in the proper replacement of specific parts
Department for diagnosis
and repair.
There are many variations in the step-by-step procedures used in
installing various parts, and varying skill levels of individuals doing
Engine has poor performance, The incorrect plugs may have the parts replacement. These instructions cannot anticipate all
runs hot or overheats: been installed – re-check. circumstances or provide advice and caution on each. If you are
The spark plug gap may be in doubt concerning your ability to replace the part or have any
incorrect – re-check. questions, consult your local Toyota Dealer Service Department
and have the work performed by an experienced technician.
One or more ignition wires may
have been damaged. For further assistance, contact your Toyota dealer.
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.

Visit our Web site at www.toyota.com

M/N 00405-HOWTO-SPLUG

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SparkPlugsHowToBroch(New).qxd 7/21/04 7:09 PM Page 2

DIFFICULTY LEVEL
FROM ONE TO FOUR– FOUR BEING THE MOST DIFFICULT
ESTIMATED TIME INVOLVED
60
INSTRUCTIONS (continued) INSTRUCTIONS (continued)
MINUTES
2 DISCONNECT THE IGNITION WIRES OR COIL PACKS – Pull 5 CHECK THAT OLD WASHERS ARE REMOVED FROM THE
the plug cable boot straight out to disconnect each cable. On SPARK PLUG HOLES – Remove any old spark plug washers
TOOLS AND SUPPLIES models with individual ignition coil packs, pull the coil pack from spark plug holes.
straight out. Some engines may require the removal of the top
• Genuine Toyota Spark Plugs cover to access the plugs. CAUTION: Be sure that no dirt or foreign object falls into the
• Spark plug wrench or socket set with spark plug socket spark plug holes.
CAUTION: Do not pull on the wire itself. This may damage the
• Gapping tool and wire feeler gauge carbon conductor inside, which may affect engine
• Rag or paper towels performance. Also, do not pull the cable out from the distributor 6 SET SPARK PLUG GAP –
• Penetrating oil cap (if so equipped). Using the wire feeler
• Torque wrench gauge, check the gap
between the electrodes
• Pen or pencil
3 REMOVE SPARK PLUGS to the correct clearance.
– If you can reach the Carefully bend the outer
base of the spark plug, electrode as required to
INSTRUCTIONS apply penetrating oil
where it seats to the
feel a slight drag on the
wire gage. See the repair
cylinder head. This will manual for correct spark
1 ALWAYS REMOVE THE KEYS FROM THE IGNITION WHEN protect the threading in plugs and the gap
WORKING ON THE VEHICLE. SEE CAUTION ON BACK PANEL. the cylinder head. clearance specification.
mWARNING: To prevent injuries, allow the engine to cool Remove each spark
before starting to work. See CAUTION on back panel. plug and its metal
NOTE: Mark each ignition wire and corresponding spark plug
washer with a spark 7 INSTALL SPARK PLUGS – Be sure that each new spark plug
plug wrench or spark has a new metal washer. Install each plug as far as possible by
location (if so equipped) with a number on a piece of masking plug socket. Keep the hand. Make sure the plug is correctly threaded. Tighten firmly
tape. For in-line engines, start #1 at the front of the engine and plugs in order as you with the spark plug wrench or socket but DO NOT OVER-
mark the wires in order to the rear. The front of the engine is remove them. TIGHTEN. See the repair manual for proper torque specification.
always where the drive belts are located. For "V" engine
configurations, mark as CAUTION: NEVER re-use old washers. ALWAYS screw in the plug
follows: 4 INSPECT OLD SPARK several turns by hand to avoid cross threading the spark plugs.
PLUGS – If the plugs
V6 – When facing the NOTE: Spark plug threading on aluminum cylinder heads is
1 3 5 have anything other
engine with the drive easily damaged. DO NOT FORCE THE PLUG.
than brown to light tan
belts closest to you, the or gray deposits, save
left side of the engine them, and speak to your
has cylinders 1-3-5. The Toyota dealer's service
8 CONNECT THE IGNITION WIRES OR COIL PACK – Install the
right side has cylinders wires or coil packs in the correct order. Push the spark plug
2 4 6 department advisor. boot (if so equipped) firmly over the plug end.
2-4-6. This also applies Check repair manual for
to transversely description of bad spark
mounted engines. plugs. Spark plugs are 9 TEST DRIVE THE VEHICLE – Remove masking tape from the
good diagnostic ignition wires. Start the engine and listen for any unusual noises.
indicators of engine Test drive the vehicle. Record the date and mileage that the
V8 (2VZ-FE) – When performance problems. plugs were changed in your service maintenance log. Check
facing the engine with 8 7 the scheduled maintenance guide to assure all maintenance is
6 5 NOTE: Platinum tip spark plugs with a service life of more than performed at the appropriate time for the mileage.
the drive belts closest 50,000 miles and iridium tip plugs with a service life exceeding
4 3
to you, the left side of 100,000 miles are installed on some Toyota models. Refer to CAUTION: Make sure that all tools and supplies are removed
the engine has cylinders 2 1
your Owner's Manual or the Toyota Spark Plug Application from the engine compartment.
2-4-6-8. The right side Chart for the correct type of spark plugs for your vehicle.
has cylinders 1-3-5-7.

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