Old water pump was going so I replaced the radiator, water pump, and thermostat but it still overheated. The upper radiator hose was hot and there were no leaks. Also, the air in the cabin wasn't hot or cold and AC lines were warm. Thanks.

Ok. I have a knock low in my 2001 4.0... I'm pretty sure it's piston slap (roughly 1 RPM) I already pulled the transmission and transfer case to replace the clutch, so in for a penny, in for a pound. The plan is to pull the engine and do the mechanical work myself, and find a machine shop for...

2001 Wrangler Sahara 4.0, 5-speed. Ok. So I was on a highway drive. It was very hilly, so I was back and forth between 4th and 5th, doing a fairly steady 70mph give or take. Right before my destination, my Jeep starts knocking. Sounds like the lifter tick, but lower in the engine and lower in...

I got a 1999 jeep wrangler TJ with the 4.0 idles fine I'm getting a random sputter almost as if I rapidly turned the key off and back on. While holding a steady 30 MPH on a dirt road I stared at the RPM Gauge until it did it and when it stumbles the RPMs jump to 3000 RPM even tho the motor...

Hey guys, for the past couple of days I‘ve been noticing a strong burning smell, almost like running rich, when engine braking down a pretty steep hill. The engine sits at 1700-1800 rpm in 3rd going down the hill and only notice the Smell near the bottom but goes away while I’m going up the...

Hi All: I appreciate your advice and yes i know I spent to much money already ... I am looking for some advice on replacing or upgrading the engine on my 1997 Jeep TJ SE. Normally, I would consider selling but I am in to this pretty deep; this was a father-son project and we put a lot of nice...

I am in the process of swapping a 1993 cherokee 4.0 motor into a 1990 yj which previously had the 4.2 liter. It is a pretty rough jeep and only going to be used on trails and around the property so I am fine leaving it pretty rough around the edges as far as wiring and look. What I know Right...

I am going to swap my 4.2 over to a 4.0 cylinder head, manifold, and MPI and I pulled the parts from a 1995 Grand Cherokee. I am fine with the mechanical side of this since it really isn't any more complicated than putting a new head on, but I am having trouble finding a good wiring diagram. I...

Recently, my tj body was separated from the frame and motor. TJ had a ton of rust and the frame needed lots of work. After the repairs, jeep was put back together in a rush and I'm finding that the lines that go to the intake and probably EVAP may have been hooked up incorrectly. Now I'm not...

Hi all, I was curious as to what it takes to get an Eaton m62 or m90 to work on a 4.0 i6. I have heard there are differences 05-06 but I would like to focus on 04-prior. Anyone have a build sheet or a list of what they did DIY or have a cheaper kit that I can't find? I was looking at getting...

High mileage jeepers, what was the first thing to mechanically fail in your engine (electronic sensors aside)? My 98 has about 225k give or take on the odometer, no major issues or slack in performance yet. What is your experience?

Don't you just hate it when some newbie joins the forum to ask questions before contributing anything?:) Well I'm about to look at a few TJ's 2000 - 2006, specifically the Sahara 4.0 auto model under 75000 miles. It's a retirement present to myself. Living England there are only a few...

I noticed the engine sounded different and the CEL came on (P0140). A few months ago I had to replace the exhaust manifold for bank 2, due to a crack, and this sounded similar to last time. So I checked the manifold yesterday, and found a crack around the back end of the bank 2 manifold. From my...

I was recently doing donuts in the snow on my 98 TJ 4.0L, 5-speed. When I was done I started to experience clicks whenever I turn my wheel along with an engine knocking sound. The engine was fully heated up. There is no leak in the power steering fluid. The right tire rubs against the control...

I've been a long time lurker. I'm a new Jeep owner, bought my first TJ in March. It has been a blast. Had to replace some radiator hoses, did an oil change, and the oil pressure sending unit. While the Jeep was on the lift, I saw some of the worst frame rust and rotting I have ever seen on any...

Need Advice! On the forum, I am in touch with the seller of this vehicle: http://www.wranglerforum.com/f139/2003-tj-sport-lifted-locked-low-miles-2056145.html I'd appreciate opinions on price. He's the ninth (yes ninth) owner, but is sending me the carfax this evening and says that it was...

Good morning, all. I crashed my YJ a couple years ago so and I never posted much on here when I had it, but I'm coming back to the forum since I'm looking for another Wrangler (TJ or preferably LJ at non-ridiculous price - as if those exist :lmao: . I figured my first post back should be...

Hey Guys, I've got a 2002 4.0 sport that will crank over with the starter but won't start. There are no gauges when I turn the key to the on position. It ran the morning of, then it wouldn't start that evening. I sent the computer off to be checked and it came back as no issue, and I benched...

I've had a bad lifter for quite some time now and I am about to dive in and remove the head to get to it all. Is there anything else I should go ahead and prepare to replace while removing everything? 2004 TJ Wrangler X 4.0L ~130k miles Thanks in advance!