I got a used 2002 Highlander Limited. But the MPG sometimes went to 8MPG and sometimes 24MPG.And a the low rate (8MPG), there is black smoke. I went to one certified Toyota mechanic, they changed all. From the strainer (inside the tank) to the spark plug and clean all hoses. And after that they cleaned the "Check Engine and VSC" displayed on dashboard. But the next day,I got the same error on the dashboard. For myself I think that this issue comes from electronic part which command the quantity of fuel to inject into the cylinders. Hope somebody could tell me more and how to solve the problem. Regards.

Well, if it was a certified mechanic, I'd take it right back in and say the problem still exists because i wouldn't pay for a repair that wasn't done. It does sound like a fuel injection problem though.

Thanks.But do they need to change the fuel injector or they can just clean it?

Depends, of course. You can clean an injection system out, but it requires a pressure valve and other equipement.

True. I have had great success with the gas additives in clearing water out of the system, keeping injectors and cylinders clean...etc.

That means you did it yourself!Could you please tell me exactly,what you use and how to clean your injection system?Do you have any internet site telling about that?Thanks.

While waiting for the repply, you could google the phrase "cleaning fuel injectors" and see what comes up. SOmeone probably has a step-by-step guide on how to do it.

Tanks you. I've check with Google and I found some good link about how to clean the injector. http://www.aa1car.com/library/2003/ic30336.htm

GREAT! Glad I was able to point you in a positive direction. I hope you get them all cleaned and everything works great from now on.

Try a 20oz. bottle of Techron with a full tank of fuel and drive that till almost empty.

Then get back.

Hi there could someone tell me if the 2008 highlander gas engine awd is good on fuel economy in the real world;I my self drive to and from work a total of 56 miles I do need the space,and I really believe that the 08 highlander does not burn alot of gas like the domestics do thank you.