Yaris/Scion & Vitz :: Toyota Echo Motor Start To Idle Really High For A Couple Of Minutes

I've always find solution to solve my little issues with my Toyota Echo 2004 Hatchback. Since last summer, my car seems to have a lot of problems to idle well with the fine rpm. Here are all the events :

-it all started last summer, when the motor would start to idle really high for a couple of minutes, before getting back to normal. When this happened, a p011 check engine would light up. I switched to synthetic oil, and it greatly reduce the number of time this happen, but it didn't solve it entirely. It usually happens when the motor is warm, but still not hot.

-Only once, during a long ride, I got a check engine. When I left the highway, my motor wouldn't stop idling high. stop/start the motor wouldn't change anything. I checked the check engine codes, if I remember well : p011, p016 and misfire. With a friend, we checked the crankshaft sensor, and it was really dirty, so we washed it, and it solved the problem! A few days after, I also change my spark plug because they were starting to be old.

-A few weeks ago, I started my car and it was idling high as usual to heat up faster (it is winter now). But then, the rpm suddenly drop really quickly. The rpm was really low for may be 2 seconds, and it nearly chokes, but just before it went up back to normal. Then low/high/low/high until the motor was hot. No check engine. I disconnected the battery for a few minutes, and when I reconnected it, the problem was solve. I also checked the air filter, but it wasn't dirty.

-Then, sometimes when I start my car, idling is fine but suddenly at a red light the motor start to run really low with a lot of vibrations and a bad smell. Stop and restart the motor solve the problem! But only until the next red light, or until the motor is warm enough. Still no check engine.