onlyinajeep726

Actually, to my surprise, it hasn't stalled as of yet. It seemed like it wanted to the other day, but so far, it just runs rough and spits/sputters. I smell gas fumes real bad too, if that means anything.

xjdreamer2

hello ,i just bought a 2001 cherokee xj, seems to run well although it gets horrible gas mileage, is there any common problems that could be causing this issue?

odgreen

It's a jeep. What's your horrible mpg?
I'm happy with my 9 mpg.

xjdreamer2

that sounds about right....9 maybe 10 mpg

96xjclassic

Is your jeep still stock?

Blackolive

OBD II ,CAN/OBD II usually won't throw a code when the coolant temp sensor goes nutz. Mine was telling the PCM that it was -44*F and went to running rich, misfiring, and shifting weird. Check that first, $17 part.

onlyinajeep726

Coolant temp sensor has been replaced but never caused issues like that... And I don't have OBD II because I have an '88 Renix/AMC system.

Blackolive

Gotcha, my bad, I should have read back a bit more.

onlyinajeep726

Can the parts store still test mine even though I don't have OBD II?

Blackolive

Ok u have the system I'm not as familiar with. [open mouth:insert foot:]
I got some reading to do.

Blackolive

From what I've seen there's no check engine light, no trouble code storing, and no way to scan for codes.
I would check the basics. Cap and rotor: look for carbon tracking. Colder temps=better conductivity.
Vacuum leaks in rubber hoses are bigger when cold.
Check for moisture in fuel. 30* swing in temps can allow fuel tanks to suck in moisture. Or water in it from gas station.
I'm gonna have to read up on the Renix system. I love OBD I and OBD II systems.
Curiosity aroused.

cherokeeguy1

hey guys i got a problem with my 88 XJ the other day me and my dad went to town and i went to take off and it didnt wanna go i was like what the heck so my dad drove it back to the house my dad said it was either the vacuum hose then he said it was probably something up with the pilots inthe trans. but im not sure tho

cherokeeguy1

i get about 15-16 if i drive easy hard its either 12 or 14 depends

salad

Assuming you're running stock wheels/tires/gears/and your speedometer is fine, you should consider the following:

- Do a tuneup including oil and fluid changes, spark plugs, air filter, and all that. Gummed/soured plugs, fluids outside of spec and clogged filters can cause poor efficiency.
- Commonly the exhaust manifold cat develop a crack, most often on the downpipe weld near the collector way down by the flange that bolts up to the cat. I bought my 1999 and within a week or so this busted open. Drank a ton of gas, made a slight gurgling/hissing sound (especially under acceleration) and smelled pretty bad. Originally I thought it was fuel but it's the same smell as when a car warms up in the winter
- Over time the pre-catalytic converter O2 sensor can get dirtied up and lose sensitivity and cause an unnecessarily rich mixture... similar to an exhaust manifold leak
- Are you running with the defogger on all the time? My last car had no AC, so I got used to having air blowing on the windshield constantly. Imagine my surprise when I found in the manual that, even though the **** isn't marked (and there's no light... grrrr) the Defog vent control actually runs the AC system when its above freezing outside. For a month I was running my air conditioner without even realizing it

Once you rule the above out the problem may be more in depth.

Edit: I have poor record keeping (forget to reset trip odometer and write down fuel consumption) but I got 21.something MPG over Christmas break carrying 4 people up to the family's place for dinner.

onlyinajeep726

Thanks for the help so far. I'd be lost, otherwise lol.

*Edit: I went out and bought some Iso Heet. It's a fuel antifreeze, water remover and injector cleaner. Also poured in some octane booster for sh¡ts and giggles. Got some gas too so all the additives could mix in real well and drove around about 10 miles. I'll have to let the Jeep cool down and sit for a bit and start it up later to see if the problem reoccurs. I'll let you know what happens.