I just bought a 2003 Kia Sorento. Great car, I practically stole it off the lot, but the mileage sucks. I was looking for accessories on EBay and saw something about a Fuel Saving Module that is guaranteed to save me 5 to 10 mpg by changing the fuel/air injection to a leaner ratio. Do these chips work? Is there a long term detriment to the engine or fuel injectors?Do Fuel Saving Modules Work?They most likely don't work. Even if they did, they would starve your engine and you would get sensor errors and the car will be a lot slower. There are some fuel additives that seem to work for me, like STP's Gas Treatment and Fuel System Cleaner. Don't expect a serious gain in fuel efficiency though.
I doubt there is something wrong with the car though, I think they get like 16/19 mpg (city/highway) or so.Do Fuel Saving Modules Work?Bad idea. If the engine is running properly, the a/f ratio is about 14.7:1. Leaning this out will cause driveability issues and potential for catastrophic failure. I don't know what you mean by %26quot;sucks%26quot;, but if you feel like the mileage is not where it should be, take the car to a reputable service center and get it checked. There may be a problem, i.e. oxygen sensor, MAF sensor carboned up, etc. Good luckDo Fuel Saving Modules Work?These gadgets are right up there with snake oil. Don't waste your money!
Your best move is to have the car checked by a competent garage to ensure the engine is operating it peak efficiency. The condition of spark plugs, catalytic converter, oxygen sensor and any fuel and ignition system adjustments and components can have a significant effect on consumption.
