Carbon Buildup = Fuel Injection Flush???

[CTScott]

Originally Posted by zfarsh

ok, thanks guys. One thing i forgot to mention is that is it automatic transmission. I am a bit confused about all this, as there are different answers.

However, I am guessing the Brake Fluid might not be bad because of the ABS (but it is not in the maintenance manual, so i wasnt 100% sure, and I am a newb). Still waiting to hear more responses. Now, it looked complicated doing it myself from what i have seen in pictures / videos, but will relook at that and see if i can find it for a yaris. Anyways, the 100$ brake fluid is not that huge.

However, what is huge is the Fluid Injector Flush and the Throtling Body Service. They say there is carbon buildup and it is recommended i flush these out and do the maintenance at 89,000 km. I know Jambo101 said i dont need it. Would like to hear a bit more on this subject, and why i dont need or why do i need it. What is this issue anyways. Again, I have never started using additives yet to my fuel (some say it is good, others say it is bad), and dont know if this will remove the carbon build-up, and i dont even know if carbon build-up is serious and needs to be addressed quickly. Again, would appreciate your thoughts and detailed reasoning. Has anybody been told this by the dealer / mecahnic before?

The fuel injector and throttle body cleaning are really likely to not be needed. If the throttle body had significant carbon deposits you would notice the engine running a bit rough. The same basically goes for the injectors.

Don't let them talk you into doing a fluid change on the automatic transmission either, unless it is on their nickel.

Things like these are how the dealer makes serious money on service. After my father retired from his engineering career, a friend of his that owned a car dealership convinced him to be the service manager. My father went back into retirement in less than a year because he refused to "play the game" of constantly trying to sell people services that their cars didn't need.