Why is 2002 Toyota Echo stalling?

Answer 1

The most common problem with an older Toyota Echo is a dirty throttle body. If you take your car to the dealer they will always recommend cleaning the throttle body. Fortunately this is very easy to do yourself, you want to disconnect the air hose connected to the throttle body, you do not need to remove the throttle body (although you could if you want to clean it even more thoroughly). Spray a generous amount of Seafoam Deep Creep (penetrating cleaning/lubricant) into the throttle body and scrub it with a wire brush or even a tooth brush, work the open/close valve by hand as you clean, when it is open you can clean further into the throttle body, there is also a tiny hole that you should focus your cleaning efforts on. Towel it dry and repeat until the towel comes out clean, you can also leave a bit of the deep creep in there overnight, it will not harm your engine.

If that doesn't do the trick, the problem could be the fuel filter or fuel pump. An engine needs 4 things to run, fuel, air, compression, and spark. Your problem could be related to any of these. Its pretty easy to check your air filter. Hard to check the fuel filter or fuel injectors. Compression is probably not the issue, spark plugs are easy to change but probably not your issue either.

Checking/replacing the air filter, clean the mass airflow sensor at the same time (its attached to the air filter box) with electronics cleaner spray. If none of that helps, you want to check the fuel pump and/or replace the mass airflow sensor.