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When you do a tune up you should replace the cap, rotor, plugs, wires,airfilter, and fuel filter, this will insure that you get the best mileage. Also have the coil checked, for proper resistance. If it starts to get weak it will throw a lower than normal voltage spark. You can not look at spark plug wires and tell if they are good, this can only be done with an ohm meter. The resistance should be 3000 to 6000 ohms per foot of wire. One other note is if your car feels sluggish or lacks power is to check the catalitic converter. These clog up and stop air flow thru the engine. There are many many things on cars that will result in poor gas mileage. A good mechanic doesn't go by just the codes a car spits out, they have to read the numbers and diagnose what is wrong.
Poor gas mileage can have many roots but the best way is always to start with the ignition system. Have a look at the sparkplugs, if you've got the I6 4.0 engine it is easy to check them. Spark plugs are cheap and easy to replace. Also check the spark plug wires, be sure the connections are tight and free from rust. Check the distributor cap and rotor and if they are rusty/greasy clean them up. After you've cleaned and checked the ignition items (spark plugs, wires, distributor cap and rotor) you can move on to the fuel injection system.
Replace the air filter, it is cheap and most people overlook that single item.
When was the last time you replaced the fuel filter? A clogged fuel filter reduces power drastically which in turn affects fuel mileage.
hola como puedo saber cual es el problema con mi 96 grancheerokie cada vez que acelero despues de 1500 rpm el motor pierde fuerza y avienta explociones por el throurolbody ya cambie los sparkplugs,cables, rotor, cap y el motor ya esta a tiempo firstname.lastname@example.org
what kind of exhaust do you got, the converter actually may help get better mileage. scan egr for errors in emmisions, get the timing checked mabe running rich, check pcv valves,test knock sensor, 02 sensor( scan might not pick up) lemme know how it goes
i would change the fuel filter and i would take a flashlight and to make sure none of my fuel injectors are leaking and i would also put the car on ramps and put something behind the rear wheels and check all of my gas lines under the car as while.
usualy it is 20 miles to the gallon and to improve your gas mileage i would do a tune up... spark plugs, wires, cap, rotor, fuel filter. and add tune up in a can its only like $4.00 from autozone. and also replace your airfilter, add air to your tires like 35 psi. and clean your fuel system .