Just Joined, and Have Questions
 

Good morning all. Just to give a quick background, I had a '94 4Runner with the 3.0 V6, 3" body lift, 33x14.50x15 tires on mags, no cat, dual Flowmaster 40 series mufflers, just a fun truck, then 4 weeks ago the engine blew on I-75 while I was on my way to Georgia for work, with my wife and kids, that was a bad day. That week I found a '93 Grand Cherokee in my price range, so I bought it, the down side is though it has a straight 6, it has 211,000 miles on it, it's got a rough idle, vibrates everything at a stop, runs good and smooth when driving though. I'm pretty sure it's the ignition coil, distributor cap and rotor, or the TPS. I plan on replacing them all anyway, but ultimately, I'm not a fan of fuel injection, and I'd like to drop a carbureted 318 in it. Here come the questions. Will a 318 bolt straight in? What models came with the 318 standard in the carbureted days? And anything else anyone can add in?

thats not the downside sir....the jeep 4.0l is one hell of an engine...imo keep it and get it running right and it will last u forever.
I have a 1998 jeep cherokee that has 298,000 miles on it and with the exception of a small exhaust leak..it runs like the day it came off the showroom floor.

211k on a 4.0 jeep, that thing ain't even broken in yet! Do a full tune up and fuel system cleaning and you should be good to go for at least another 200k!

thank you for replying
 

I appreciate the replies to the post. I considered the option of keeping the 4.0, but I am really not much of a fan of electronicly run engines. I may only be 29, but I'm much more of a fan of carburetors and V8's. I've heard a lot about this engine, and I have heavily considered keeping it, which I will for a while, at least until I can afford a swap. I've done most of a tune-up, just need the coil, cap and rotor, and I believe a new TPS. I changed the oil to run high mileage mobile 1, with mobile 1 filter, and a quart of marvel mystery oil, and I've been concentrated fuel system treatment in with every fill up, and I'm happy getting 21 mpg at the moment.

drop in a built 258...

I will take that into consideration.

dont over use the fuel treatment... i herd some one say that too much could ruin some components on newer motors

I definitely haven't over done it, after the third fill-up with a bottle in each, I've stopped adding the treatments. Considering I'm getting 21.5 mpg now that I've treated everything the way I did, and it's running better now by far, I think it'll do me good. I put 3,000 miles on it in this first month I've had it, and it's running better and better every day, just need to get a few more things done with it here, but that'll have to wait til it's paid-off. I like it thus far, but I still have the itch to pull the engine and drop in a rebuilt, carbureted 318. No matter what happens, I'm gonna probably do it, and keep the 4.0 to rebuild and have as a spare, or sell it rebuilt, considering there are so many people who love that engine in particular, but that will be many months away, I ggotta get my motorcycle first.

That is the old 4.2L. You could use a 4.2 block with 4.0 head. Needs some machine work though.

93-98 GCs came with 318s in them and the 98 Limiteds had 360s in there. You can swap one in, but you'll need to swap trannies and t-cases as well, plus then need a wiring harness for it all. You would be better of with the 4.0 that is in there. They are an extremely well loved motor by jeep people all over, have loads of low end torque, plenty of aftermarket support, and can be made into a real firebreather.

You will never have the throttle response from a carb motor like you would with a EFI motor, the start up is easier, better fuel mileage, and the 4.0 is more reliable than the 5.2 is. Hell, I'd be willing to swap in a 4.0 in place of my 3.9 V6 in my Dakota if I had the time and money.