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1999 4.0 Problem 1 - Takes forever to start (15-20 seconds), even worse when its cold. When it does start, it stutters, lags really bad on acceleration, and if Im not careful it will stall. I think it could be the IAC? CPS was replaced about 5 months ago. Could a bad check valve cause the...

fuel pump or fuel pump filter perhaps? Hows it start? Does it take a few tries or does it go right away?

Everything I have read, and heard says NOT to flush the AW-4. In fact, I have read that Chrysler even recommended against it (after stating time and time again to do so).

one last question, is Rockauto.com generally a good place to order these replacement parts or are their parts junk?

What, besides the scheduled maintenance stuff, should be done at 110k? Im going to do the standard fluid refill (diff, transmission, oil change, power steering fluid change, etc.) but what else should I be replacing? Im thinking about doing Thermostat, housing, and temperature sending unit...

My '99 XJ did the exact same thing several weeks ago... Driving down the highway, it cut off. Dash lights still on, radio still working, but the engine was totally off. Coasted to a stop, no go getting it fired back up again for a few minutes. Finally got it going and moved it to some parking...

does anyone have pictures of how the wires are run stock? Should have taken a picture but didnt think of it...

Memo to self: right tool makes the job SO much easier. Bought a boot puller and its cake! Im replacing rotor and cap today as well. Been using anti seize and dielectric grease as well Most of the plugs look quite bad, and are gapped around 0.050...way out of spec. They all have a pretty...

Okay someone give me some tips here.... Ive changed plugs and wires before, but holy hell this is a PITA. After 45 minutes of work all I have to show for it is the first plug wire removed from the Distrubutor... I cant get any of these boots to budge an inch. I suppose I should go pick up a...

I would think with a properly oiled K&N filter, it will be fine. Thanks for the link, I'll check that out. I think I might toss on a new after cat exhaust as well. Havent done plug/wires yet. Its raining pretty bad today. I'll get around to moving the Jeep in the garage eventually. Also...

Champions. Thats what I run in my TJ and it runs great. Also, yeah the engine is reaching normal temperatures. I know one of the bigger factors in my mileage is probably my tires as well. They are really quite bad.

Bought a filter recharge kit for my K&N filter. Didnt realize these kits are good for more than one recharge, so every time Ive bought a vehicle with a K&N I never bothered with buying the kit :laugh2: Picked up new plug cables (Bosch. These any good?). New plugs, and picked up a bottle of...

I dont stomp on it or drive like a maniac so I know thats not the issue. The plugs/wires definitely need replacement, but I cant imagine that those 2 items could possibly cause a drop that much could it? Most of the time Im not hauling anything around that would add any weight that would mess...

Its a 99, so Id guess its the lock bolt on the PS pump then...

That is what we believe it might be. As to how old the belt is, no idea. It looks fine though. Where can I find the tensioner? Ive got a haynes manual but its not with me ATM.

Just checked both O2 sensors. Both seem to be hooked up fine, wires look okay. Ive read about how to test them, but Im not sure I feel comfortable with it, plus I dont think I have the equipment needed to do that here. Does one generally fail over the other? They both are clearly the stock...

Until the engine heats up to around standard operating temp. anyways. Im thinking the pulley/clutch on the A/C unit is bad, but Im not quite sure, as this is my first vehicle with A/C :yap: (drove a TJ without it for years) Could this have any effect on gas mileage? Mine is currently getting...

4.0l engine. Its got a 3 inch lift on 31's. Im getting around 10 mpg city (very rarely do high way driving). I think this is around 4 mpg low. Ive looked around at how to calculate the difference for my tire size, but I cant seem to find out how exactly to find the accurate gas mileage...

found out today that the XJ has 3.55 gears in it.

Ive got a 99, but I dont want to pull stuff apart quite yet. Another dealership quoted me 42 if I provide my own keyfob, which sounds a little more reasonable.