93, 4.0, 4x4, non lift, stock tires.

200,000

new plugs, wires, cap, bug, intake filter, cleaned cai, and throttle body.

last fill up i got 11.2 mpgs.


suggestions? no trouble starting, no over heating, no hesitations, no codes, and 75-80% of the time i drive like a grandpa.

i was possibly thinking 02 sensors, i have no documentation on the jeep so i went parts changing crazy. any other ideas to help out my mpgs? 11.2 is way to low.

 

oh and exhaust from header to tail pipe is brand new within the last 50k
just dont know about 02 sensors

 

Thoughts ?

 

pcv, o2 sensors.... and fuel filter... and change your diff fluids... and did you do your rotor under your cap?

 

run a bottle of lucas injector cleaner through ur tank,it might help,it atleast helped me

 

Did rotor bug yes. I'll try the o2 pronto

 

Ran some already. No go

 

Does your Jeep have a hard starting issue at all... you might want to upgrade to neon injectiors... make sure at 200k that you do not have leaky injectors too..

 

hahah funny you should mention that.
i literally just sent payment for a set of them.

they are not leaking and i never smell gas.
the filter is something i overlooked as well. thank you for mentioning.

also no hard starting at all, ever. starts like a dream.

 

A faulty o2 sensor is by far the biggest cause of fuel mileage losses. It usually also will not throw a code when malfunctioning.

They are very simple and cheap (<$50) to replace. I'd do this first before anything and see if things improve.

 

thanks for the heads up, ill replace it tomorrow.
i was going to order it online but i couldnt find it cheaper than 60 plus shipping. so ill hit advanced auto parts.

you recommend changing the rear sensor as well?

 

might as well do both... if one has not been changed the other one probably has not been either..

 

If it's a 93, you only have 1 sensor

 

Doh i forgot what year it was....

 

Ohhhhhhhhhh really? Nice. I did not know this. Thanks for all the replies guys. Will update this thread accordingly with what my mpgs do