How calibrate a spark plug? i'm owner of toyota echo and i don't know how i can calibrate the spark plug!! i need something to calibrate??

a repair manual will probably tell you. it has maintenance schedules, models of commonly replaced parts (spark plugs, oil type, weight etc)

http://www.papertownspdf.com/downloads/toyota-yaris-echo-repair-manual-1999-2010/

Spark plugs are replaced when the electrodes are found to be corroded, burnt, cracked or oil fouled.
Normal spark plugs need to be replaced every subsequent 30,000 Km.
Iridium - tip spark plugs are replaced every 80,000 Km.

Transmission is defective. It requires major repair. Better to replace with a good known one.

The spark plugs are under the coil packs. remove the top plastic engine cover and you will see a coil for each cylinder, remove one coil at a time and with coil removed you will see spark plug in hole.

remove cover on top of engine 4 bolts remove plug boots and you will have access to the plugs

If it's not specified in the owner manual, and if it's not already been replaced, 90,000 miles (144,000km) is probably the longest you should wait before replacing it.

good day,first of all you may ask the owner if he has the service manual so you can change the last timing belt changed. secondly you may try to check the belt itself if it has some tiny cracks or a little loose or a little worn. hope this helps, have a nice day

Remove carefully, engine being cold. Aluminum heads have fragile plug threads. Replace with new plug winch should normally be pre-gaped at .043 in (for Bosch Platinum plugs the gap is .032). Tighten snugly but don't use too much force. (I used torque wrench at 15 ft/lb) Replace coil module and reconnect wire and you are done.

Most Echo owners consider the Denso (Part #SK16R11) or NGK (Part #IFR5T11) Iridium plugs to be the best replacement for this vehicle and they can both last for 100,000+ miles.

Good luck and happy new years.

Hey alanacheson,
The spark plugs are underneath that cover on top of the engine (should say VVTi on the cover).
Just take that cover off, and then you will see the four ignition coils. Take off the four ignition coils (with igniters), and you will see the four relatively long holes underneath, and the spark plugs are at the bottom of those holes. You will need a good spark plug socket (preferably a thin wall socket) and a 6" or 12" extension. This is actually a very easy job, and can be completed in less than an hour.
Hope this helps.

ignition wire or oil leak at cylinder valve cover to spark plug