Geonovast

I've only had it for a few hours and I already love it. It's gonna take a bit to get used to this keyboard though.

Switch to Firefox, it'll remember what you typed if you click back when stuff like that happens.

I believe the motor itself is the same, but the plug was changed in 91. I don't know if the plug itself is removable/swappable, but I suppose it's possible.

You should be good at least 87-90, but 84-90 may be the same.

I'm 99% sure XJ and MJ belts are different.

Why would you think he typed the wrong dates?

Yes they do. You just have to adjust the potentiometer.

On the index page, in the upper right corner, there's a little like that says Mark Forums Read. Click on that, and everything will be considered read. I do it every time I leave, so I know what's new when I get back.

My 88 4.0 4x4 XJ is getting 26 mpg and it's always in power.

Controls the shift points of the transmission. Shifts at lower RPMs in comfort mode. Comfort is essentially useless, if you ever find yourself with one, just leave it in Power mode. Comfort doesn't save you any gas, trans doesn't like it, and it'll just piss off the people behind you.

XJ just rolled past 211,111.1

I talked to him last night, I get the feeling he's at least seen this thread. He told me (again, don't kill the messenger) that he's gotta get the harness boxed up and out by Friday.

Yes, you should be able to. Be sure to check the alignment afterwords if you plan on driving it at all. After a potential height change, the toe alignment needs to be checked and adjusted if necessary. Here's a good write-up for it. http://www.4x4xplor.com/alignment.html

IIRC the wrangler coils would actually end up lowering your MJ.. You need to get ahold of a set of XJ/MJ 4.0 coils. I may be backwards about that, however.

Check to make sure all 6 bolts holding the trans to the motor and tight. It's probably not the case, but your symptoms may be a sign the bolts aren't tight enough, you don't wanna go where that can lead.

My 91 2.5 runs funny sometimes, sometimes it gets 16, but other checks I've gotten 23. My XJ's managing 26 somehow, and that's a 4.0

It isn't likely, but a Dying CPS can cause those symptoms. Hm.. I thought the T-case/CAD vacuum was a separate system. I'll have to examine the XJ tomorrow to see what's going on under there.

:cheers:

CPS is the Crank Position Sensor. It's a magnetic pickup bolted to the top of the bellhousing, on the driver's side. It reads teeth on the flywheel so it knows when to tell the coil to fire. If it's dying, it may not read fast enough every time, causing late firing. It may just need to be cleaned up. I believe new ones run about $60-$70, but you might be able to find a used one for much cheaper. I believe you can get one from any 86-90 2.5L or 87-90 4.0L

Find yourself some front coils for a 4.0. I put 4.0 coils on my 2.5, and it popped it up about an inch and a half. Then use the isolators as spacers after that. You want as much lift in the spring as possible.