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Old 09-29-2010, 08:10 PM   #1
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does the 2.5L really suck??

now dont get me wrong i love my jeep and wouldnt trade it for the nothing but it seems like every time i fix something on this 2.5L engine something else goes wrong? is it just me or is it something to do with that engine that is just not right? had valve cover leak at 70K, at 80K front main seal busted, manifold split at 90k and now at 100K ive got a rod knocking. has any one else had this kind of problem out of this engine or am i just to hard on the poor little thing?

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Old 09-29-2010, 08:18 PM   #2
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Just bought my first Jeep last week (97' TJ 2.5L) with 128,XXX miles. I'm getting ready to do cap, rotor, plugs, wires and manifold (cough). We'll see where it goes from there.

I've been wrenching on Land Rover Discos for the past two years and I don't think it can get much worse than that. I know where you're coming from with the "fix one thing and then something else breaks". It's a mystery everytime you turn a Land Rover on. You never know what's going to happen.

Good luck and stick with it!!

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Old 09-29-2010, 08:21 PM   #3
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A 2.5 has it's place.............somewhere. Just kidding, man. Lots of folks have great luck with their 4 cylinders. I think I've had better luck with 4.0s though. Sounds like it's been run too hot or something.
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Old 09-29-2010, 08:31 PM   #4
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Ill tell you Ive had my 2.5 for about ten years its a 99 its been awsome I meen no power house or anything but had not one problem with the motor never.
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Old 09-29-2010, 10:30 PM   #5
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I had the 4.0L. Now I have the 2.5L.

I really miss the extra power but I am getting used to it. As far as mechanical problems - I really haven't had any to speak of. Good luck with yours!
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Old 09-29-2010, 10:37 PM   #6
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honestly, no, it doesn't suck. you won't have drag-strip horsepower, but if you've got a stick, and if you're geared right, the mighty 2.5L will do great on the trails.

my first rig was a '98 2.5L TJ. it was a 5-spd (with a/c!). it had a 3" lift, 32" mud terrains on 8" wheels and 4.65 gearing. i couldn't race it and i wasn't doing any burn-outs, but it was a very reliable rig and a trusty little crawler! - and, it was my daily driver. i would've ran that little guy to the ground, but someone made me an offer on it that i couldn't refuse, so i sold it.

...now i drive an automatic 4.0L I6.

built right, don't count out the 2.5L.
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Old 09-30-2010, 04:26 AM   #7
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Yes, it does suck.
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Old 09-30-2010, 04:59 AM   #8
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Off-trail, a 2.5L can do everything a 4.0L can unless you're climbing vertically up a cliff face. If you're going fast offroad, you're not offroad. Don't really need the power. (Need maybe not, but of course it's maybe nice to have in some situations)

With bigger tires, though, a 2.5L can drag a bit. From what I' ve heard and seen, I wouldn't go above 31's on a 2.5L even with a regear. I've tested them out and it's really not a problem. I can imagine with some 35's on it it'd be sluggish.

My 97 has 118k miles on it and runs perfectly. Mechanically it's a gem. 29's on it right now but moving to 31's soon. Can easily hit the 130kph limit over here.

Don't let anyone ever tell you a 4L can do stuff a 2.5 can't.
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Old 09-30-2010, 02:00 PM   #9
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I have a 98, 2.5 with 2"lift and 31"s , and a couple weeks ago I went wheeling with some friends and after being able to do those trails / rocks, I'm happy with it. of course the 4.0 would be nicer especially on the hwy but thats ok.


















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Old 09-30-2010, 02:19 PM   #10
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LOIC sweet pics!!!

I don't think the little 4 bangers are quite as tough as the 4.0L but that's just based on my observations. There's a reason the 4.0L is referred to as "bullet proof".
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Old 09-30-2010, 02:36 PM   #11
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I've had more 2.5's with blown motors than 4.0's....the 4.0 does have its own problems in the bottom end
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Old 09-30-2010, 02:45 PM   #12
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Quote:
Originally Posted by mrcarcrazy View Post
LOIC sweet pics!!!

I don't think the little 4 bangers are quite as tough as the 4.0L but that's just based on my observations. There's a reason the 4.0L is referred to as "bullet proof".
thanks, I agree with you, but I think if you keep up with the maintenance there shpudln't be much problems with that engine.

with what I was able to do with mine I was really happy and surprise that it could actually do it, and it's enough for me, I am not planning of doing anything harder than this.
now when I was looking for a jeep, if I had found a 4.0 for the same price as my 2.5 I would have take it right away, that's for sure
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Old 09-30-2010, 04:47 PM   #13
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The 2.5L in my Jeep has been extremely reliable. It's got about 160k and many of those miles are hard. It has seen more off-road hill climbs near or on the rev limiter in the past 10 years than I can even begin to explain. It has gone through 2 water pumps and it's second exhaust manifold leaks a little when cold, but after a few seconds of driving the heat expands the metal enough to close the leak. I just keep the oil changes up and every few years do plugs, wires, cap and rotor. With the correct gearing it is fine for me on the highway, unless there is a strong head wind and or a steep mountain pass. But one tire size above the correct gearing and all the power goes out the window.

Right now with 4.88 gears, 35s, and the taller 5th gear of the NV3550 transmission, 5th is about useless. So I am either revving the crap out of the engine above 65 in 4th or stuck with cruising at 60-65mph, which is what I usually do.

In deep snow I once in a while wish I had more engine for wheel speed, sometimes 3rd gear 4 low and high RPM will let me plow through some really deep snow, but if the tires hook up too much then the engine will start to bog. It's not that I can't make it through, it just requires me to back up and hit it again.

But there has been more than a few steep climbs that my 4 cyl, 2nd or 3rd gear low range and 5,000 + RPMs has passed a lot of other rigs with V8s. In all reality it was because the V8 guys were not using enough skinny pedal, but it is still fun to be the underdog sometimes.

Loic very cool pictures. What trail is that, it looks like Moab?
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Old 09-30-2010, 06:29 PM   #14
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I look on Craigslist and see to many 2.5 Jeeps say in the discription "new motor" or "rebuilt motor"..... but yet the body only has around 100,000 miles, ive also personally knew a friend who had his 2.5 blow at 98,000 miles with good maintence and no offroading
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Old 09-30-2010, 06:37 PM   #15
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When I bought my Jeep. It had its motor replaced at about 130,000. Its got about 60,000 on it currently and runs like a dream. Offroad it is fine, followed V8's all day
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Old 09-30-2010, 07:17 PM   #16
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thanks Mike, no it was in Logandale, about 60 miles north of Las vegas, I think its behing the Valley of Fire
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Old 09-30-2010, 07:22 PM   #17
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there was some nice jeep, as you can see I was the smallest...lol so I named my jeep "Shorty" lol..











sorry I didn't mean to highjack...
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Old 09-30-2010, 07:26 PM   #18
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eww that yellow jeep looks bad I cant spot it

edit its the missing rollbar padding
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Old 09-30-2010, 07:48 PM   #19
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my 98 tj says to have 160k on it actually has between 215k and 220k because during winter the gauges turn off from time to time, except gas for some reason but better tht way! and besides that all i do is well take care of it, do what u ahve to do, never had any problems with it, the only big problem ive had is a squicky fan belt, changed all fixed, and well during the winter, second gear becomes handicapped, works but sometimes kickout of gear but hey besides that no problemos, 2.5l is a good engine excpet its a turtle, but onistly if you have a 4 banger, get a stick!! auto makes it even slower
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Old 09-30-2010, 10:02 PM   #20
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the 2.5L in mine has never been run hot and has never been run ragged but i tore it down tonight and it wasnt a rod knocking it was the piston. the ear/guide or what ever you want to call it on the bottom of the piston broke off all the way up to the oil ring and was rattling around in the oil pan. while the piston was wobbling around in the cylinder. im not saying that the 2.5L is a crappy motor. i was asking if anyone else has had problems with them. mine has been on some long trips and long trail and has wrinched out a many of 1 tons. like i said before i love my jeep its just the engine im not so sure about. now ive got to take it completly apart and hope that the scares in the cylinder walls are not to deep. wondering if it would been better to go ahead on my 350 prjoect and scap the 2.5L.
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Old 09-30-2010, 11:38 PM   #21
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Yes.
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Old 10-01-2010, 12:30 AM   #22
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If you replace your 2.5L with a 350 I will be so jealous because I have to comute to school up a mountain in my 2.5L and would love nothing more than to put a power plant in it. Please go for it, and post results just to give me hope for my jeeps future.
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Old 10-01-2010, 12:54 AM   #23
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I am on my second 2.5 motor in my 97 Tj and it's about to blow up again I guess it doesn't help I bounce it off rev limiter all the time haha o well I am in the process of putting a 350 in now but I would never go back to a four-cylinder unless it was turboed
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Old 10-01-2010, 05:20 PM   #24
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i just priced the parts that im going to need to fix that one piston.$520 TO FIX ONE PISTON!!!!i can rebuild my 350 and with another $100 rebuild the 700r4 thats behind it. im thinking it would be crazy not to start the 350 project. my take me awhile cause my moneys fun but i think im going to go for it.
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Old 10-01-2010, 05:41 PM   #25
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Quote:
Originally Posted by mrcarcrazy
LOIC sweet pics!!!

I don't think the little 4 bangers are quite as tough as the 4.0L but that's just based on my observations. There's a reason the 4.0L is referred to as "bullet proof".
Yes agree I have a 4.0 but I've driven my friends 4 banger and his was stock and I couldn't spin tires in a manual on the road in like my jeep that has 33s and will sit there and burn the rubber off of them and that's the only difference I can tell along with the acceleration haha but a Jeep is a Jeep [o|||o]
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Old 10-01-2010, 08:09 PM   #26
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It does not suck. Mine rocks out hard and it just passed 110k. Don't let anyone tell you it sucks compared to the 4.0... the 2.5 is the 4.0's ancestor. They made the 4.0 off of the 2.5's platform. It is the same engine minus 2 cylinders. The 2.5 is every bit as bulletproof as the 4.0. It is just more difficult to get tickets with. Take heart... you have the engine that came first!
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Old 10-02-2010, 03:01 PM   #27
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Originally Posted by Tjwheeler101
I am on my second 2.5 motor in my 97 Tj and it's about to blow up again I guess it doesn't help I bounce it off rev limiter all the time haha o well I am in the process of putting a 350 in now but I would never go back to a four-cylinder unless it was turboed
Anyone who drives a vehicle like that is going to have motor trouble, I don't care what's under the hood. I have a 2.5 with 142,000 on it, headers, exhaust, ignition, and I love it, I can smoke my brothers 4.0 on or off the road. Unless of course that road is an interstate, and were going up a steep hill. And better gas mileage to boot...
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Old 10-02-2010, 03:11 PM   #28
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My 2.5 has 215 000 KM on it and it runs strong, no issues so far
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Old 10-02-2010, 06:23 PM   #29
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i have both 4.0L and 2.5L and I like them both however they are very different in alot of ways.
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Old 10-02-2010, 06:49 PM   #30
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Anyone who drives a vehicle like that is going to have motor trouble, I don't care what's under the hood. I have a 2.5 with 142,000 on it, headers, exhaust, ignition, and I love it, I can smoke my brothers 4.0 on or off the road. Unless of course that road is an interstate, and were going up a steep hill. And better gas mileage to boot...
Your brother must have 3 or so plug wires off lol....never seen a 2.5 smoke anything but itself

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