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Old 09-06-2011, 01:36 PM   #1
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No high speed

Hi,

Got a '95 2.5L w/ 83,000 original miles. Runs great until the interstate. I can get just up to 70 in 5th until I hit a headwind (doesn't have to be much of one) or a slight hill (and there aren't many in S. Florida) and I can't over 60 - 65. RPM's just won't come up. Cruises thru gears 1 -4 just fine, just can't hit the high end. Mileage is 15-18 at best. Any ideas?

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Old 09-06-2011, 03:37 PM   #2
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What size tires and gears are you running? Stock or lifted with larger tires?

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Old 09-06-2011, 03:42 PM   #3
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that's a 4cyl for ya.
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Old 09-06-2011, 03:48 PM   #4
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try driving behind other quickly moving suv's outside of that drop a v8 even the sixes on oversized tires will struggle to maintain 70 on the highway.
i've gotten in the habit of drafting other larger fast moving cars, I can get up to 87 on the speedo behind an x5 on 31 inch tires with my 4.2 I'm guestimating that's around 93-95 mph better mileage too. I don't suggest going too fast though, at high speeds around a slight bend the back end will float outside on you even over a small bump
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Old 09-06-2011, 03:53 PM   #5
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Sounds like you're two cylinders shy of the interstate "toll"...
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Old 09-07-2011, 01:11 PM   #6
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Yeah, your cat is clogged. That is a classic symptom. It will run fine but you can't get anything out of it at higher speeds.
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Old 09-07-2011, 03:36 PM   #7
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Quote:
Originally Posted by Hurricane Hank View Post
Hi,

Got a '95 2.5L w/ 83,000 original miles. Runs great until the interstate. I can get just up to 70 in 5th until I hit a headwind (doesn't have to be much of one) or a slight hill (and there aren't many in S. Florida) and I can't over 60 - 65. RPM's just won't come up. Cruises thru gears 1 -4 just fine, just can't hit the high end. Mileage is 15-18 at best. Any ideas?
there ain't a thing wrong with it, thats how all 4 cylinder yj's are....they aren't ment for speed, 70-75 is about the top speed for them...its not a mustang.
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Old 09-07-2011, 03:45 PM   #8
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well you are driving a brick, and it doesn't help that it's a 4cyl...
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Old 09-07-2011, 03:56 PM   #9
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Yeah, your cat is clogged. That is a classic symptom. It will run fine but you can't get anything out of it at higher speeds.
"cat" meaning, catalytic converter? Sorry, new to jeeps and mechanics. And how do you clean this "cat", or do you replace it? My '95 2.5 manual trans does the same thing, this wind we've been having here in TX is keeping me at 50-60mph.
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Old 09-07-2011, 05:00 PM   #10
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Yes he means catalytic converter. Replace it with a high flow cat.
1995 Jeep Wrangler Magnaflow Direct-Fit Catalytic Converters - Videos & 188+ Reviews on Magnaflow California Legal Catalytic Converters
Really helps the exhaust flow smoother.

My friends old 4 cylinder TJ never did too well on the high way. It was always hammered and struggled in wind and on hills.
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Old 09-07-2011, 08:32 PM   #11
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Welome to the life of a driving a 4banger. You don't have anything wrong at all. Just nature of the beast. One option you do have is to re-gear. I'm getting ready to do that in the next couple of weeks (ordered them today). From what I've read on here (done lots of searching) it should improve the top end speed drastically. It is a crappy feeling though to hit a steep grade with 18 wheelers fully loaded passing you like you're tied to a post on the interstate.
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Old 09-07-2011, 10:44 PM   #12
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I'm running 31 x 10.50s on my 4 cyl YJ, and I rarely shift into fifth gear. It's just a pain to have to downshift every time I'm on a hill which is most of the time. Also, I'm running with no cat, so that part of the equation doesn't even apply to me. The bottom line is if you're going to run larger than stock tires, you have to re-gear or use fourth.
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Old 09-08-2011, 12:08 AM   #13
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Originally Posted by yjdad View Post
I'm running 31 x 10.50s on my 4 cyl YJ, and I rarely shift into fifth gear. It's just a pain to have to downshift every time I'm on a hill which is most of the time. Also, I'm running with no cat, so that part of the equation doesn't even apply to me. The bottom line is if you're going to run larger than stock tires, you have to re-gear or use fourth.
heck its like that going up hills at 45-50 even having to go back to 4th, sometimes 3rd to maintain speed

really 5th gear is the gas saver at 35-45mph, not the high speed gear....these lil engines just don't have enough umph to take these jeeps to 100 or more...nore would i wanna go that fast in a jeep

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