so ive got an 89 xj limited...3 inch lift on 31s...200k miles...what the hell is causing me to get like 6mpg? i dont drive it hard...just doing 55-65 mph for about 30 miles and back home i burned up half a tank....
any ideas or suggestions on how or what to fix/change?
i love the hell outta my xj...and if i cant get the mpg fixed...ima have to trade it for something gas saving....eewww honda....

 

Why exactly do spark plug WIRES need to be replaced in a tune up? No other wires are ever replaced in a truck for 200k miles unless they fray. What's different? Has anyone gone 200k miles with a single set of spark plug wires?

 

probably that stinger. just saying.

 

im thinking its because of the intermittent pulse that'll cause the wire to become 'wore out'. ever seen a small gauge wire pushing a large current for awhile? it'll cause it to burn up on the inside of the wire itself under the rubber outside. maybe that?

or how about i have no friggin clue and i totally bs'd that ^^...

 

That's nuts, but go some google searching.
Correct tire air pressure**
O2 sensor**
Coolant temp sensor?
Cracked exhaust manifold
Huge tires?
General tune up? Plugs, wires, cap, rotor
Plugged Cat?
Clean throttle body
MAP Sensor
Fuel filter?
Seized hub bearings / u-joints?

 

naa that stinger has been on the jeep for a total of 3 days....its gotten horrible gas mileage since day 1 (of me owning it) could it have somthing to do with the lack of a vacuum line from the valve cover to the air box?

 

no. not hurt mileage. but if you were missing one from the intake mani then possibly.

 

Lol. No. That would not cause that terrible mileage. Any other symptoms? Lack of power. Fuel leaks. Yada yada

 

not really sure how its supposed to drive....its acted like this since i traded my miata for it....bad gas mileage....but its supposed to get 20 highway...not 6....i can understand that with 31s i should get about 15 highway...but still not 6 lol

 

When was the last tune up?

 

i pulled the cap and rotor a couple weeks ago and cleaned it all up....(wasnt dirty at all) put new plugs in it 3 days ago...new cps...oil, filter, valve cover gasket....wrapped the crap outta the wires in electrical tape...cuz im broke....but yeah...not even the slightest improve in mpg...

 

Heres a question. Close up picture of the front of your jeep?

 

First question. Second is I think your losing raw gas somewhere.

 

I know mine is a little bit somewhere... Like it comes from the top and I can see a little bit on the passenger side of the tank

 

pic on the tree stump is with sway bar on....and before i took off flares, trimmed fenders, and bed linered the whole jeep