Eagle

California doesn't like guns. You can't even buy a regular AR-15 in CA, or any semi-auto pistol that holds more than 10 rounds. Forget California. Can't have Jeeps without guns.

You don't have Corvettes in Florida? I believe Corvettes have had aluminum radiators for a good many years.

Already asked (by you) and answered in another of your threads: American Motors owned Jeep when the XJ (and MJ) was designed. Renault was a major partner of AMC. The design of the ignition and injection system was a joint venture of Renault and Bendix of Europe. RENault + bendIX = RENIX. The Renix system was used on the 4.0L engine from 1987 through 1990, and on the 4-cylinder engine from 1986 through 1990. You have a Renix MPI, or MPFI, is "multi-port" fuel injection. TBI is "throttle body" fuel injection. MPFI

I'm pretty sure they are 10mm but I don't remember the thread pitch.

The heater core on my '88 XJ let go last year and soaked the carpet with coolant. It was a slow leak and I didn't pick up on it until stains started showing up in the carpet on the tranny tunnel and passenger footwell. Since I have floor mats and mostly I'm alone in the Jeep, the stains were definitely not from passengers' feet. My recommendation is to bite the bullet and replace the core now. If you flush it, you may get heat for a week or three, but if there's that much rust and gunk in there, once you get coolant flowing again (if you can) it's going to find a way out. FWIW, my heater core was flowing and had been flushed twice, when the radiator was replaced. They just don't last forever -- that's why there are replacements.

I believe this switch is going to have your aux fan running all the time, so you might as well just do as someone else suggested and connect it to a source that's switched with the ignition and forget about finding a temperature-activated switch. I wasn't kidding. The search for THE switch to do what you need to do has been on-going in the XJ world for at least ten years. Nobody seems to have really found one that works -- right -- yet.

It may have come to you wearing 235/75-15s, but from the factory a 4-cylinder would have been wearing 205/75s or 215/75s. 235/75 is already larger than the largest tire used by the factory on the 6-cylinder XJs and MJs. Just to put it in perspective. Next thing, compare the dimensions of a 30x9.50-15 with a 235/75-15. The 30 is slightly wider, otherwise they are almost identical. Hate to be a party pooper, but I suggest you stay with 235/75-15.

The external is easier to bleed and easier to replace. For once, listen to your father.

Fourth post in this thread: viewtopic.php?f=2&t=4917&hilit=bleed+height+sensing

Well ... He said, "Go to your local tire shop and ask what's popular." You said, "I guess we'll have to agree to disagree." That sounded a lot to me like you didn't agree with him. :dunno:

Poor fuel mileage can be the oxygen sensor. If it's not reading correctly, it may be calling for the injector (singular because this is a TBI 4-cyl) to squirt more juice than what the engine needs to maintain the optimum air/fuel mixture. Last time I replaced it on my '88 4.0L, I knoew it was due because when I would take my foot off the gas to shift (5-speed) I would hear a muffled "POP" from under the floor. That was a small backfire in the catalytic converter, caused by raw fuel that was NOT being burned because the O2 sensor wasn't reacting to the change in engine conditions quick enough when I dumped the throttle and disengaged the clutch. How old is your O2 sensor?

'94 YJ Wrangler

Well, CW, it appears as if we are just going to have to agree to disagree :shake: It appears as if in every tire thread, you tout domestic brand name tires... Where in his ONLY post in this thread (quoted above) does CW say anything about domestic brand tires? Even as a tire shop owner/manager, how can you possibly DISagree with "Stop in your local retailer and ask to see whats most popular and go for it"?

You da man! :bowdown:

I would think it could be made up out of some copper tubing, a sweat tee, and a little ingenuity.

Two points: First, the scale on the temp gauge is not linear. There is no marking for 190, so you have no way of knowing where 190 is on the scale. More importantly, the temp sensor for the gauge is at the top back corner of the head. If you are low on coolant, that's where there will be an air pocket. The sensor will not be in flowing coolant, so it won't react quickly to the engine heating up. By the time it thinks it sees 190, the actual temperature will be significantly higher.

It is possible and it has been done. Potential obstacles to be addressed: 1. Front fenders aren't really the same, when you look closely. To mate up properly with the "new" header, you'll have to buy a replacement fender for hers that got crunched. 2. Dashboard mounts are slightly different, so I've been told. There are threads on this site of other people who have put the new dashboard into an MJ, so it can be done. 3. Brake & taillight wiring for the MJ is different than for the XJ, because the MJ doesn't have amber turns. Even when using an older XJ harness, there's going to be some adapting needed where the "new" chassis harness ties into the rear portion of the MJ harness. 4. Location of the door strikes/catches moved. This has also been addressed on this forum.

Pete, some aftermarket company (I'm sorry, I don't remember which one) used to offer that lower hose insert as a part. Several folks on NAXJA used it for just this purpose. Naturally, it was discontinued about four or five years ago. Don't know if any other company has picked up on the idea.

Don't think it's a solenoid. The AW-4 does have solenoids for controllers, but if you pull the fuse for the TCU it should still shift manually -- just won't have second gear. The '98 I think doesn't have a separate TCU, I think in '97 they went to a combined PCU (Powertrain Control Unit) but the actual tranny operation is the same. But that price for a '98 with low miles is still a steal. Grab it, buy a junkyard tranny for it, and never look back.

Not two ratios, but two types of attachments for the speedometer cable to the speedo head. The early type was from 1984 thru 1986, the later type was 1987 thru 1990. After 1990 the speedo is electric. I still think the change may have been in mid-year 1987 rather than a clean 1986/1987 break, but I haven't been able to verify that.

That's because the oil gets thinner when it's hot. But don't run it if you don't have coolant in it.

No. Not related to using 4WD. But unless you have converted, you have the "closed" cooling system. Those are VERY difficult to get all the air out of after working on the cooling system. One of the symptoms of not enough coolant is no heat. It seems contradictory that it would overheat yet not generate heat, but when the coolant level is low, nothing gets to the heater core. The engine can overheat, but you'll have no heat. Do a search on "burping" the system.

You mean this? The Corvette sensor? The one that doesn't operate at the right temperature range for what he needs? THAT part number?

Cooper Discoverer AT/S or HT/S The AT/S will be better in snow, the HT/S should give slightly better gas mileage.

Keep in mind that the electrical stuff changed over the years. The front clip will bolt on if you have two good fenders in the "new" clip. The profile at the top corner of the front fenders changed in '97, so just trying to put the new header and grille on with the old fenders requires some customizing. Also, making the '97 side marker lights work will require some wiring modifications. As to the interior -- your 90 has a mechanical speedometer. The '97+ Cherokees are have electric speedometers, and the polarity of some of the gauges has been reversed (IIRC, specifically the fuel gauge). You can bolt a '97 dashboard into a 90 chassis, but making it work is going to require getting into the interior wiring. The seat pedestals for the 97+ XJ are different from the MJ and different from the early XJs. You can't even bolt the 97 seats into an MJ without custom fabricating seat pedestals.