i have a 93 jeep wrangler yj with over 200k on it was towed behind an rv. its got the dang 4cyl in it.. it gets maybe 10mpg is this normal its a 5 spd and i have 30in tires on it what could i do to help my mpg
Not sure what mods I do have, whatever it has, it came with most of them. I did go to an electric fan and I do see a spacer under the throttle body but I don't know if it has a 4.0 throttle body or upgraded injectors or what....
Not the sharpest bulb in the box....
My Jeep is possessed with the goal of making me lose my religion....
Exhaust problems = leak in the exhaust manifold = O2 sensor think its running lean = dumping more gas = bad mileage
Fix your exhaust leak and replace your O2 sensor
X2 this. Do what Que says, along with a complete tune-up. Look for any and all possible vacuum leaks, replace hoses or use clamps. Re-torque and tighen down the intake and exhaust manifold bolts at the cylinder head - they have a known habit of working loose and killing the MPG's.The 4-bangers are very sensitive to these things. Clean out the TB, the IAC, etc. fresh plugs, cap rotor and wires, air and fuel filters, the whole 9 yards.
My 1991 is getting a solid 20 MPG's on 31" tires with stock gears and it goes on the NY thruway. If you want 33" tires then it would be a good idea to re-gear yours. But get it tuned up first.
***--- Wrecking Crew member ---***
"I've prolly been around longer than you think"
i didnt see an 02 sensor when i looked the cat looks pretty bad so im going to cut it out and put a new muffler on there... no check engine lights on... the guy i got it from just did a tune up and replaced the fuel pump.. going to replace the fuel fillter again run some seafoam threw it but the spray kind.. also going to check all those bolds any one got the specs for that