when you do,save yourself the headache and get one directly from jeep, heard a lot of people complaining aabout them from autozone, o'reillys, etc

 

Its got a slight miss at idle that causes it to idle rough. Got a friend who's a jeep tech, he listened to it and he said while it is missing its not doing any damage. There's no miss or hesitation under load. Cps is 3 years old, but O2 sensors are factory. Those are all on my list of things to try. Its upsetting because this is a crate engine with 10k on it.

 

haha... ghetto fixes... well, my first thought is that there is a partial clog somewhere in the fuel or exhaust system and that running it at high rpm for an extended period of time is enough to break it loose. my other thought is that this might just be gypsy magic. did you recently aquire some gypsy tears in a little crystal vial? cause i needs me some of them! really idk though... there is a high and low idle "switch" that is activated when you get on the skinny pedal hard enough. i have this buck and chug and hesitate issue with my 99 xj and when you first start it up and drive it, it runs rough. but if i floor it for a coula seconds (like enough to get up to 35mph) it clears up and runs like a top. ive replaced everything! and yet it persists... idk... maybe the cat is going...

 

o2 sensors make a big dif!!! if your gonna do th o2 sensors, get the goor quality 4-wire, pre heated ones. and do both the downstream and upstream sensor!! doing one is only half the equation!! they are like 100+/ea.

BEFORE SPENDING $$$, get it on a code reader! even if the CEL isnt on, there might be a code that has stored in there that will shed light on issue!! i discovered this recently when we plugged my xj in: no CEL, but a couple codes!

 

Yeah I used up all the gypsy tears on this one. My misfires came back a little but the idle is still rock solid. I had put in Bosch plugs, I'm going to switch them out with champions and see what that does. I just changed my O2 sensors with Denso ones, made a big difference on mileage but that's it. Anyway my sister just started dating a mechanic that drives an XJ, so I'm going to grab a sixer and let him figure it out...

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The downstream only check to see if the mini cats are working. Upstream is the only ones that actually affect how the truck runs. Napa carries ngk oem ones that I'm gona look into. I've had a code reader on it before, I work at a tire and lube place.