I have a 1993 Jeep Wrangler. 2.5L 4 cylinder, 5 speed manual. I have been getting bad gas mileage for a while now. I used to get 16-18 mpg highway, but on a trip back from Colorado to Texas I started getting about 10 mpg (I found out when I ran out of gas). The Jeep has been gettig 10/11/12 mpg ever since. The Jeep runs fine. Power is there like normal. Judging from the sudden change, my thought was it must be a sensor. First I changed the O2 sensor. I have also replaced the throttle position sensor. No luck so far.
Country: United StatesMake: JeepModel: WranglerYear: 1993Engine: 2.5L 4 cylinder
O2 sensor, throttle position sensor, engine trouble codes (previously threw code for TPS voltage, but code didn't show last time I checked for codes).
Welcome to JustAnswer! I'm Kenny and ready to get started helping you.When was the last time the vehicle was tuned-up? Injectors cleaned?
Its not a daily driver any more. Mileage on the tune up isn't high, but couldn't say exactly when off hand. I have run injector cleaner that you add to your gas tank, but nothing more than that.
Well the normal things to cause poor fuel economy are the oxygen sensor, restricted air filter, dirty injector (need cleaned by putting cleaner in the fuel rail) or incorrect fuel pressure. If tuned up the air filter should have been replaced but not hard to check to make sure it is clean. Then would have the injectors professionally cleaned
Service Manager with many years of hands on experience