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I should mention that Valvoline oil has sodium in it which confuses the analysis whether there is coolant in the oil or not. Coolant has sodium in it.

And THAT is why folks with 0331 heads should do oil analysis. Catch it early before the big damage happens.

Consider that a head with the casting flaw in it isn't cracked initially. Thermal stress could aggravate it. Just a possible theory. Like a rock chip on a windshield - it could be the place where the crack initiates and travels.

Cracked head is directly checked if you don't have other symptoms using oil analysis. I've used Blackstone Labs several times as periodic checks. So far 200k on one of the jeeps (now sold) and no crack. 88k on the other and still good. (both 0331 castings) I'm suspicious that cracks might be...

I too have experienced the first-stop-damp-lockup with my '84 Cherokee when I had it. Just something to consider is that if the rear shoes were put in backwards you'd get excessive braking force. I think it goes that the shoes with the shorter length of lining (if you have that type) go on...

Of the 3 Cherokees I've owned (1984, 2001, 2001) 2 of them have had oil pressure senders fail such that they read way too high. They would read idle pressure normal but revving the engine when hot would indicate 80 psi which is virtually impossible. If your oil viscosity is correct this is...

Immediately after starting the alternator is under load to recharge the battery from the start. Adding the a/c compressor is about the biggest load the belt will see. So tighten the belt some more. It doesn't feel real good to tighten things a lot because the excess tension may help the water...

My '01 doesn't have any heater control valve at all (unlike the '84 I used to have). I plumbed in a ball valve in the heater circuit and tapped across it to supply flow thru a coolant filter I've put in. The valve I put in is a brass ball valve (better at ON/OFF than common faucet type...

I would have preferred another picture backed out to help give more precise location but.... My 2001 has a black body connector for cruise control in that area. (aft of the battery, forward of the relay/fuse box, inboard of the fender) There is another gray body connector lower toward the...

I had code for small evap leak. Traced it to cracking single-wall rubber hose that connects the charcoal canister to the evap pump on the firewall. They use gray plastic tubing for most of it but there are two connectors of single-wall hose. Mine were cracking. Replaced them with double-wall...

I seem to get better than 100k out of water pumps since I've been using Dexcool and distilled water. With the green stuff and DI water the prior vehicles ('84 Jeep, '85 chevy) would only get about 35k per pump. Just one owner's experience though.

Faint tick-tick-tick-tick sound? On my 2001 jeeps that would be a very small pump that is pumping air into the emissions system and the gas tank to test the integrity of the system. Only runs when the gas level is somewhere less than Full and only runs for a little while after startup. If the...

Both my 2001s had the torx

I pursued the small leak code on my 2001 a few years back. What I found was that Jeep used single wall rubber tubing to join sections of the gray plastic tubing that is the evap emissions piping from the pump under the hood to the canister near the tank. I found two junctions, one fairly near...

I'm struggling with a compressor clutch that won't engage when the underhood temp is really high. I get this same symptom of high idle because the compressor isn't engaging but the PCM thinks it is. Maybe your compressor isn't actually engaging?

I prefer double wall fuel line. Had to replace some connectors between runs of the plastic piping in the evap system. The connectors were single-wall rubber and when they aged and cracked they leaked. Fuel line is thicker and tougher so will last longer against environment. (not sure about...

Check for rear brake shoes installed correctly. Too much material on the leading shoe would give much more braking action. (leading = the shoe that tends to lock itself into the drum when the drum is turning in the normal direction)

I don't use ham much anymore but when I do I use magnetic mount. Same for CB radios for group trips. Rigs go in and out of the vehicles quickly.

Wrong weight oil. 10W-30. Or bad oil pressure sender.

I just did the job on my 2001 Cherokee using the 3 o-ring set from the dealer ($13) and this tool obtained from Amazon ($12) Felo 0715730748 T60 x 7-1/2-Inch Torx L-wrench, 348 Series This is basically like an Allen key only with Torx end. Short end clears the motor mount and the long end...