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What do you think about possible 02 sensor issue? Doesn't the mixture get info from the 02 sensors? Bad manifold gasket? I've sprayed carb cleaner all over while engine is running, no rise in RPM.

Plugs all look normal, no knocking or pinging. As for gearing and load... For many years and many miles with this gearing and 33" tires the Jeep was normal. I pulled a twin axle, 14' foot flatbed trailer across the USA a few times with NO issues. The head scratching continues! I will...

OK........ The saga continues!! I have not lost my sense of humor!! Although mass amounts of alcohol are sounding pretty good about now!! After reassembly earlier in the week, I drove the Jeep around town and highway about 125 miles. All good. Friday I loaded it up to travel 900 miles north...

Good article, Thank you!

Good morning, Here's the morning update. Removed and replaced the # 3 main bearing ( the Thrust Bearing ) the rear of the bearing is worn very thin. The crank is also worn, but that's for another day! The crank had .118 fore and aft movement, I am hoping this was the source of the "knock"...

I run 30 psi in all four tires. All are good. I run. NAPA Gold 1515 oil filter, its got less than 1000 miles on it. Mobil One high milage oil, less then 1000 miles Just drained and serviced transmission with Mopar ATF-4 oil. The oil that drained from the transmission was dark. It only has about...

The over temp issue seams to be in check! The Jeep seams to be not producing normal power. I'm still chasing potential issues. As I noted, I've added a hard line oil pressure gauge. When the engine has warmed up, the pressure drops to below 10 psi at idle. I have a high volume pump to install...

Will not know if the temp issue is resolved until I get down the highway a while. The issue did not manifest itself until I was highway speeds for hour +. Will do that next couple days.

What is your recommendation for the best spark plug for the 2004 TJ 4.0?

33" tires, stock gearing, corrected speedo gear. Have installed the 195 thermostat, Flex - A - Lite fan, Mopar water pump, Mopar radiator, Mopar thermostat housing, Mopar temp sensor. Running around town temp is running just below 210 indicated. lower than it was with the 205 degree...

Here's the RPM at 65 mph!

I will be tearing into the project Tuesday. I have been prepping everything before hand. (painting thermostat cover, water pump ) installed new temp probe into new thermostat housing. Will be installing new fuel rail modified with fitting for fuel pressure line. Adding this instrument...

There is no change between AC on or AC off at idle. I just got back in town and will be jumping into this issue/project tomorrow. Have the new fan to install, 195 thermostat, Mopar Water Pump, replacement temp sensor, and a bunch of other items. I'll keep you posted. Thank you!

Correct, there is a winch out front, it's been on there for 10+ years no issues! Temps have always run normal.

Nothing blocking the radiator, Will wire in a 40A fuse and relay. What does their temp controller tie into? I still don't think this is the issue I am chasing. The latest over temping was at highway speeds! No trailer, just cruising along! I'll feel better with the better fan installed.

Flex a lite black magic 485 just ordered!

Terry, If you have no luck finding these. Something I did years ago for a similar issue (not a jeep) In Home Depot, Electrical Department they sell plastic clips designed to hold multiple wire runs along studs. We used a few zip tied to the frame rail. Hinky as all get out! But still holding...

Fan is a Mishimoto MMFS-WRA-87 from Carid Has worked well for 2 years. Puller I purchased a Mopar thermostat.

Tire size is 33" Automatic Trans, stock gearing, I think 65mph is 1800-1900 RPM? The fan is Hard wired and operates when ignition is on. I did that since I live in warm climate areas! Heater core is new, works well. Water Pump is OEM. The Radiator is OEM, Mopar . I've ordered a 195 deg thermostat!

Radiator is about a year old OEM. Have been running an electric fan for years issue free. replaced the belt a few thousand miles ago, installed new Harmonic Balancer. OEM. I "think" I am running a 210 thermostat because the 195 would cause daily code that it was taking to long to get to...