The spark plugs are underneath that cover on top of the engine (on mine the cover says VVTi). 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.
On top of the engine, but you have to remove the cover to see them.
http://echodrivers.com/forum/viewtopic.php?t=4605url
The Toyota echo does not have wires or a rotor, each spark plug has its own ignition coil (coil pack). So really, all you can do is change the spark plugs.
Don't fix them, replace them. Its an easy job, see related link.
http://pdftown.com/2000-2002-Toyota-Echo-Service-Manual.html
The 2002 Toyota Echo OBD 2 port is under driver side dash next to kick panel
For my 2002 Echo it is 3.7 Liters with a filter change.
3.6 liters
To flush the coolant in a 2002 Toyota Echo you will need to drain it first. Flush with fresh water and then refill with coolant and distilled water.
The water could be coming from a coolant leak higher than the plugs on the engine. Look around the head for signs of any leak as it is possible that there is a head gasket leak.
No, but its the best you can get in the market. Faster starts, prevents cold start wear in the winter, better throttle response, and fuel economy. The original equipment spark plugs for the 2000 Toyota echo were indeed iridium, and they do not need to be changed for 100,000+ miles. I definitely recommend using iridium plugs when you must replace the OEM plugs. You should be able to check with the maintenance manual that came with your car for more info. But no cars REQUIRE iridium plugs. In fact, none of the Toyota Echos after 2000 came with those amazing iridium plugs that the 2000 model had from the factory. Also note that you may not even be able to buy those plugs at all anymore, from what I understand they had a special extra wide gap. The replacement plugs may have a smaller gap, and even if iridium, they may not be intended to last for 100,000+ miles. 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 like the original equipment plugs.
i have a 2001 and it gets about 39-42 mpg