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Old 07-20-2012, 01:36 AM
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Newbie questions!!!!

So not to long ago I bouhgt my third Jeep and my second YJ. Its a 1987 with the 4 banger and a 5 speed. Just wondering why its so hard to find performance parts for the throttle body 2.5 liter. I should have done more research the 87-91 2.5 appears to just suck its such a slouch even just running 235s. Is there any websights out there that carry performance parts specifically for the old 2.5?

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Old 07-20-2012, 10:28 AM   #2
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Have you done a full time up? I had an 89 4 cylinder and ran 235 75's and it could move pretty good. That was back in 94 so the engine was still fresh.

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Old 07-20-2012, 10:49 AM   #3
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X2 on the tune up! Get it running right and you will do fine.

I am running a bone stock 2.5 with 31x12.5x15's and have no problem getting around town. Tops out around 65-70 on Hwy.

There really isn't anything out there to boost the performance thoough other then maybe a high flow air filter, High flow muffler and a lot of people say swapping to an electric fan gives a little horsepower back. Other option is to re-gear if you are running larger tires.

Good luck
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Old 07-20-2012, 11:21 AM   #4
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Swapping your 10lb metal fan for an electric fan definitely will free up some horsepower. People who use the electric fans report that it really never comes on while they're driving in the city or on the highways, only at intersections where they aren't moving for a bit of time.

Do yourself a favor and do a full tuneup. You could be losing as much as 20hp by letting that engine suffer with dirty or worn out components:

-PCV valve
-Crankcase Breather Vent (Dealer part only, not more than $10 or so)
-Fuel filter
-Air filter
-Cap
-Rotor
-Plug wires (all 5)
-Spark plugs
-Injector cleaner in the tank
-Remove your throttle body and scrub it out with a good cleaner
-Replace all vacuum tubing
-Oil/filter change
-Coolant drain/flush (refill with GREEN coolant)
-New radiator cap
-Differential fluids
-Transmission oil (10W-30 motor oil is perfectly fine, and acceptable by factory standards)
-Transfercase fluid

From there it should pretty much run like new. The 2.5L has a slightly different powerband to work with. It has plenty of torque down low for offroading, but if you want to get up and move quickly, don't be afraid to roll it up to 3500rpm. 4000rpm is about the peak of its power range, don't go too far over that. On the highway you should be running about 2850rpm at 65mph.
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Old 07-20-2012, 11:31 AM   #5
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I can attest to the electric fan swap , I have a 95 yj and recently swapped my bulky clutch fan and stock air box for electric fan and cold air intake. Btw I'm running six inches of total lift in 33x12.50x15 mudders . The factory 4:10 front and rear gears with the 5 speed trans . Before the two mods I couldn't make 5 th gear and never get over 60. Now I can most of the time get into 5 and on the highway flat of course I will top at around 70-75. For short burst ... it's kind of scary !! Also I have no cat and a dynomax exhaust from head pipe back. Happy trails!
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Old 07-20-2012, 02:45 PM   #6
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I removed my fan and find that I don't have to downshift as much on the highways. I also went from 12MPG (no doors/top) to about 16MPG. Big difference. No problem with temp although have not been in a traffic jam. Buddy of mine took an electric fan from a ford taurus. the holes lined up perfectly and he uses that in case he's in traffic.
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Old 07-20-2012, 07:17 PM   #7
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I did the exact tune up as described above. About $200 for all the parts and a couple hours of my time. 1992 2.5 liter with 220,000 miles and 31" mud terrain tires gets about 18 mpg and cruises 55-60 mph easily. In fact, her favorite spot is 5th gear @ 50 mph. The described tune up is the best thing I've done since I bought it.
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Old 07-21-2012, 12:04 AM   #8
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Definately agree on the tune up.

Another thing to do is run a can of seafoam thru the motor. it will clean out all the gum and carbon deposits. Makes a world of difference. Go on youtube and search seafoam. tons of how to videos on there about it.
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Old 07-21-2012, 12:26 AM
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newbie 2.5 questions

its a new S&H Engine. I guess its not to bad I just want more. My last YJ had the 4.2. I just sold a J/K with an intake. I am mainly wondering why if its throttle body injected you can't find a throttle body spacer for it or an intake. But I am still learning about engines so who knows.
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Old 07-21-2012, 12:29 AM
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Quote:
Originally Posted by wickedyj95 View Post
I can attest to the electric fan swap , I have a 95 yj and recently swapped my bulky clutch fan and stock air box for electric fan and cold air intake. Btw I'm running six inches of total lift in 33x12.50x15 mudders . The factory 4:10 front and rear gears with the 5 speed trans . Before the two mods I couldn't make 5 th gear and never get over 60. Now I can most of the time get into 5 and on the highway flat of course I will top at around 70-75. For short burst ... it's kind of scary !! Also I have no cat and a dynomax exhaust from head pipe back. Happy trails!
Sounds good but remember the 95 has multipoint fuel injection which makes your engine like 170 HP compared to the 117 of the 87-91 throtle body model.
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Old 07-21-2012, 12:41 AM
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Thanks

Quote:
Originally Posted by Xpress View Post
Swapping your 10lb metal fan for an electric fan definitely will free up some horsepower. People who use the electric fans report that it really never comes on while they're driving in the city or on the highways, only at intersections where they aren't moving for a bit of time.

Do yourself a favor and do a full tuneup. You could be losing as much as 20hp by letting that engine suffer with dirty or worn out components:

-PCV valve
-Crankcase Breather Vent (Dealer part only, not more than $10 or so)
-Fuel filter
-Air filter
-Cap
-Rotor
-Plug wires (all 5)
-Spark plugs
-Injector cleaner in the tank
-Remove your throttle body and scrub it out with a good cleaner
-Replace all vacuum tubing
-Oil/filter change
-Coolant drain/flush (refill with GREEN coolant)
-New radiator cap
-Differential fluids
-Transmission oil (10W-30 motor oil is perfectly fine, and acceptable by factory standards)
-Transfercase fluid

From there it should pretty much run like new. The 2.5L has a slightly different powerband to work with. It has plenty of torque down low for offroading, but if you want to get up and move quickly, don't be afraid to roll it up to 3500rpm. 4000rpm is about the peak of its power range, don't go too far over that. On the highway you should be running about 2850rpm at 65mph.
Thanks, its a brand new engine. I think I am just scared because the shift light comes on at real low RPMS.
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Old 07-21-2012, 02:23 AM   #12
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Quote:
Originally Posted by JDWranglerGuy View Post
Thanks, its a brand new engine. I think I am just scared because the shift light comes on at real low RPMS.
Shift lights will always do that, it's great if you're just putting around town and cruising about to help with fuel economy, but the 2.5L is perfectly happy between 2700-3300rpm on the highways.

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