[Jyden]

I'm not at all satisfied with the FE of the Yaris.

I suspect, that since I got it from a small used car sales place, non Toyota and the service book was not kept, that things and service record at bedst would be dodgy....

Well - gues that thats the risk when dealing with such places. I read up on things at the internet, and it seems that early Yaris /Vitz sometime could have problems with the air mass meter /flow meeter, causing the ECU to give to much gas.

In bad cases this causes the engine to break down as the excess amount of gas whases the oilfilm off the cylinders.

It came to my mind, that when I replaced the old airfilter with the K&N it was dirty on the INSIDE..... First I didn't reflect on this, but tonight I thougt that if the filter is dirty on the inside, the air mas cencor could also be dirty. A dirty sencot will lead the ECU to give too much petrol.

Also, when getting the car to the a proper service, I will have them chek the charcole cannister and valve, as I suspect, that it must be responsible for the dirt INSIDE the old air filter.

Air mass censor cleaning:
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Disclaimer: DON*T DO THIS YOURSELVES !!!!!
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Be extremly carefull, in my country a new one is about 300 USD....

I dismantled the whole airbox, and took it in into my workshop. I dismantled the air mass meter.
Right enough - in the bottom of the small pipe is two thin metal strings. And they were DIRTY.....

So was the airbox inside. Cleaned airbox with rag.

Air mass censor end temperature sensor I cleaned with an artists bruch with VERY soft animal hair dipped in pure alcohol (Isopropyl alcohol). I did this repeately until there was no more dirt.

Remounted the whole thing....

While at it - I desided til reset the ECU. This is done by removing the minus lead to the battery, thus leaving the ECU without power for some time. When reconnected the ECU will reset, and load the programme, and starting to learn how the driving pattern is.

While I was allredy fitteling with the car, I desided to chek the pollenfilter, located behind the glovecompartment..... UFFF it was very dirty one centimeter of old dirt - since I could not get hold of a new one on a sunday, I cut a pice of 1 cm foam to size and mounted it.

IF the state of the pollenfilter, airfilter and airmass sensor is representative, of the cars state of maintaninse, I will have no choise, but to take it to the Toyota garage for at compleate chek-up & tune-up.

I don't want to take any risks, with anything not beeing right.

Then I drove a trip of 40 km, and it seamed to me that the car was a bit more responsive, but as it is very windy today, its difficult to say anything about if FE has improved.

Now - just for at matter of principle, I gave it a bottle of injectorcleaner in the tank - proapably first time in 10 years it has seen such a thing.

I will whact the car and it's performance closely the next weeks before diciding the next move.