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My ‘96 has this. It is not rare. I believe in ‘95 and afterwards the redesigned seat bracing was put in to help stiffen and strengthen the floorpan to lessen creaks and groans when going over bumps and ruts, and it adds a little more resistance in case of a side collision. 1996 is a...

Open the split corrugated O2 sensor wire loom between where it travels near the power steering pump and enters the long plastic square-ish cover near cylinder #1. Look for any repairs made using crimped connectors. Get rid of any crimped connectors. Strip the ends and twist the affected wires...

When was the last time you changed the fuel filter? On the ‘96 and earlier, it is mounted on the LH frame rail. I replaced the fuel pump on my ‘96 (OBD-2) with a Crown unit last Winter 2022 and it has been good so far. No issues with the fuel level sender, either. Knock on wood.

Cracked AC/heater vacuum hose or hose connector? Cracked vacuum hose fitting at the Intake manifold or vacuum reservoir bottle?

Perform a compression test on all cylinders. Write down the results and get back to us. Many parts stores will let you rent or borrow a compression tester.

Extension Housing Bushing. I've done several of these. With the engine shut down, put the transmission in Neutral, grab the driveshaft with your hand near the forward U-Joint and wriggle it. If the driveshaft wobbles by more than, say 1/16", then you need to change the Extension Housing...

Trace the forward O2 sensor wire harness - from the sensor connector - to where it enters the plastic fuel injector wire harness rail (near above the #1 exhaust port). Make sure that the wires aren't melted, or badly spliced, or goofed in any way. Be sure that the wire harness is routed...

Anyone know of an easy way of changing the (top) input shaft seal on the steering box without major surgery? One can only hope.

"What scanner are you using. Provide the exact model. Some scanners have an issue connecting to the 96 ecu. Even the HP tuners module cant run high speed datalogging on it, but they have a work around. " OK, but don't laugh. Most of my tools are rather vintage. Innova 3100. It is just a Code...

I had the same issue with my own '96 XJ OBD2. It could be simply that your reader is having an issue. My own code reader works OK on my car ... but the code reader that my local smog checker uses doesn't do a thing. He failed my car at first because his smog machine couldn't get a...

Thinking about this again. You might try to fiddle with the HVAC vent controls to listen if the whistle pitch changes. The hard plastic vacuum lines at the HVAC vent control are know to develope a hairline crack, and whistle.

Ditto ehall's suggest to use a hose to probe for the source of the sound. Alternatively, I use a medical stethoscope with the diaphragm removed (open hose end). ~ $15. I've had this whistle, twice, on 2 separate XJs. On both cases it was the intake/exhaust gasket. The OEM gasket is a...

Get yourself a mechanic's stethoscope (~ $5 - $15) and probe around your engine bay. Then get back to us.

The drum brakes on a Cherokee XJ self-adjust when you get on the brakes while traveling in reverse. When putting the brakes together it is imperative that the adjuster cable guide is flat against the brake shoe. If it is only slightly out, then the pawl will not contact the ratchet wheel on...

... "Any throttle over 30-40% and she sputters and stumbles." When was the last time that you changed the fuel filter? Just wondering.

I'm throwing this out there. Check the fuel injector wire harness. Sometimes, the old factory harness zip ties that secure it against the firewall are broken or missing, and then the harness will slump down and rub against rear tip of the fuel injector rail tube. After a while, the tube...

Had this on my '96 a few years ago. In my case, I couldn't turn off the engine! The ignition lock pushrod that activates the ignition switch (near the lower base of the top of the steering column) was the culprit. Remove the steering column cowl, and (maybe) the instrument gauge pack...

My 4.0L XJ was doing exactly this a couple of years ago. Good O2 waves on the scanner. After months of very much picking and prodding - it turned out to be a dodgy repair by a previous mechanic along the O2 Sensor Wire Harness near to the #1 exhaust port tube. I had to open the split-loom cover...

Dorman Help! Vacuum Elbows

Count your blessings. The nearest, best, biggest, nearest (to me) LKQ Pick your Parts closed up ... forever! Now I have to drive, and drive, and drive, to scavenge for parts - like in the Road Warrior movies.