Hi, I am new to the xj world (just got my jeep last week) and I am proud to say it has lasted a whole 10 days without having a problem.
Btw, the rig is a 1999 Cherokee Sport, 4x4, 4.0, automatic.
Here's the short story: ive noticed that every few days, it takes a 5-10 cranks to fire up rather than the usual 2-3. I'm not sure if that is relevant here, but here is my main issue: Once it's started, it will run fine for 3-5 minutes. Once everything is up to temperature, it starts sputtering like it doesn't have fuel, then it will refuse to respond to throttle input unless I go WOT. It will sputter and surge and It won't die, and if I pull over and stop, it idles fine with no sign of a misfire. If I turn it off and let it cool down a bit, it will give me another 3-5 minutes of normal driving. Again, at any point if I go WOT, it perks up and pretends like nothing is wrong until I back off the throttle and it starts acting up again. Also, while sputtering, there are occasional pops that sound like backfires and feel like they're right under my feet.
Here's what I replaced so far:
-distributor cap and rotor
-spark plugs
-spark plug wires
-throttle position sensor
My next move is to replace the O2 sensors. I've researched enough to know to check the fuel pressure, but I don't know how, and will probably have a friend who works at a Chevy dealer do it if I can't figure it out.
What do you guys think? Any input would be helpful.
Btw, the rig is a 1999 Cherokee Sport, 4x4, 4.0, automatic.
Here's the short story: ive noticed that every few days, it takes a 5-10 cranks to fire up rather than the usual 2-3. I'm not sure if that is relevant here, but here is my main issue: Once it's started, it will run fine for 3-5 minutes. Once everything is up to temperature, it starts sputtering like it doesn't have fuel, then it will refuse to respond to throttle input unless I go WOT. It will sputter and surge and It won't die, and if I pull over and stop, it idles fine with no sign of a misfire. If I turn it off and let it cool down a bit, it will give me another 3-5 minutes of normal driving. Again, at any point if I go WOT, it perks up and pretends like nothing is wrong until I back off the throttle and it starts acting up again. Also, while sputtering, there are occasional pops that sound like backfires and feel like they're right under my feet.
Here's what I replaced so far:
-distributor cap and rotor
-spark plugs
-spark plug wires
-throttle position sensor
My next move is to replace the O2 sensors. I've researched enough to know to check the fuel pressure, but I don't know how, and will probably have a friend who works at a Chevy dealer do it if I can't figure it out.
What do you guys think? Any input would be helpful.