|
Re: 2004 Grand Prix getting 7 to 13 mpg in city?? HELP PLEASE
Don't bet on the wires and plugs lasting 100K. If your mileage is that bad then you may want to change them as well. Fresh plugs and wires will produce a better spark that will burn the fuel more efficiently and increase mileage. You may also want to go ahead and spend the money for new O2 sensors. Expensive to change but they may be failing and have not gotten bad enough to give you a code but are causing the engine to run too rich. At the price of gas today, even a 3 mpg increase can mean a lot.
Welcome to the forum!!
|