Toyota How To Replace The Spark Plugs PDF Manual

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 tripped, 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 tapping noise: A foreign object may have fallen 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, runs hot or overheats: The incorrect plugs may have 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.

Please refer to the following sources for additional information:
• Your vehicle’s Owner’s Manual
• Your vehicle’s Repair Manual
• Genuine Toyota Spark Plugs Brochure (Available in English and Spanish)

Download Toyota How To Replace The Spark Plugs PDF Manual