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skibum12189 · 03-11-2010, 09:47 PM

Hey guys, for the record, I honestly did try my best to find the answer before posting a thread, but here goes nothing.

I have a 2000 XJ. When I start it, it struggles to stay on, sputters, and occasionally stalls out. HOWEVER, if i give it some gas and rev it to like 1500 rpm, it runs 100%. Additionally, once, it is running, it runs 100%. It never stalls in traffic, never sputters when turning, never sputters EXCEPT right when i start it. I have to give the engine gas everytime, or it will probably sputter.

The RPMs drop to like 250. If i floor the gas, it starts up like a car in 4th gear. Extremely slow, but then around 15-20 mph, power kicks in, and it runs like absolutely nothing was different. It does this in cold and hot and moderate weather. Has been doing it for a long time. Have had it for 3-4 years, never replaced spark plugs or fuel injectors (as far as i know).

I have no idea about anything that has to do with cars (or jeeps) when it comes to engines. Suspensions and wiring, I can handle, but for everything else, pops takes it to the mechanic. I tried to give you guys as much info as possible. Any questions, post them up, and i will answer them soon. BTW, fresh battery, fresh oil, fresh serpentine belt, run 87 unleaded all the time, just ran through one tank of gas after a bottle of techron, but no difference. 57k miles. THANKS GUYS!!!

4.3L XJ · 03-11-2010, 10:41 PM

When was the last time the O2 sensor was changed?

skibum12189 · 03-11-2010, 11:19 PM

To my knowledge, not since we got it in like 9/2006. Are you thinking that could be the issue?

**muddeprived** · 03-12-2010, 08:20 AM

Does the check engine light come on when this happens? I would start with the tune-up and then move on to the sensors.

skibum12189 · 03-12-2010, 12:47 PM

No, the check engine light never comes on. What would you include in a tune-up. I just changed oil, changed transmission fluid, changed transfer case fluid, installed a new serpentine belt. Brakes are up to date, just installed completely new brake lines the rear, i thought that kind of tuned everything up haha.

Is a new O2 sensor a difficult install?

**stamp** · 03-12-2010, 02:25 PM

can be ...
tune up is usually plugs wires and dist cap - as well as fluids