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Old 02-23-2012, 08:43 PM   #1
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tj losing power!

I have a 1997 tj, with a 2.5 liter four cylinder, 5 speed, 31 inch tires and stock four ten gears. i noticed about three days ago that my jeep seemed like it was losing power. i know the four cylinder is not the fastest motor out there but it was slower than normal. On flat ground i would have the pedal to the floor and i could hardly do 55 mph. when usually i would have no problem doing 60 65. It is not an ignition problem, it does not miss or anything it is just a steady slugish feeling. i checked the oil and there was no water on the dip stick so i guess the head gasket is good. What are some things I could check as to what could be wrong with my jeep?

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Old 02-24-2012, 12:48 AM   #2
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Check air filter, make sure spark plugs are still good, check tire pressure, check to see if your MPG is dropping, check for odd noises, check to see if the engine can still rev as high as it should briefly. Do this when the engine is warm with 1st gear or 2nd gear while the engine is under load. Check to see it still pulls strong to 4-5k without odd spots or loss of power.

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Old 02-24-2012, 01:12 AM   #3
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could be the cat
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Old 02-24-2012, 09:38 AM   #4
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You don't mention the Mileage on the Jeep. So with that thought in mind, I'd say
your FIRST line of action would be to perform a Compression Test on your Power
Plant. Eliminate the possibility of just a tired Motor due to internal wear. Once that
is determined, you can move on to any other of the dozen + causes of the loss of
power. Starting with the most obvious is the best way to trouble shoot any issue.
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Old 02-24-2012, 05:12 PM   #5
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alright I will pull a compression test, i can get my hands on a compression gauge from the boat shop I work at. I know outboards run about a 100 pounds to 120. What should the jeep run for compression? and it has 150,000 miles on it.
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Old 02-28-2012, 11:31 AM   #6
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What your looking for is Compression in ALL 4 Cylinders that are ALL close to each other.
Every Engine could very, but 120 would be good, 170 better. If ANY Cyl. is different by 20%
of the others, there are issues.
Other things to look at would be Fuel Pressure, Throttle Body, and I know you
said it isn't an Ign. Problem, but a GOOD TUNE-UP may STILL be in order, and
provided you have a Reputable Shop do it, they will all so check the other possibilities.
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Old 04-09-2012, 08:15 PM   #7
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I know its been over a month but i figured i would let yall know what i figured out. The compression was good thank God. It turned out to be a clogged cat. I just gutted it and clamped it back on there and got the top end speed back.

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