1989 Jeep Wrangler 2.5L Bogging down and lack of power - Jeep Wrangler Forum
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Old 01-03-2013, 06:09 PM   #1
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Angry 1989 Jeep Wrangler 2.5L Bogging down and lack of power

I have a problem with my 1989 Jeep Wrangler 2.5L with 5 speed manual trans. When I first got the Jeep I drove it for a few months and didn't really notice any problems because I was only going 10-15 miles at a time. I decided to take a trip about 40-50 miles and that's when it started bogging down, stumbling and losing power. This problem got progressively worse along the trip. Now I can only go a mile or two before it starts to act up. I can shut the key off and back on and it seems to reset whatever the problem is for a short period of time. Things I have replaced are as follows...

Plugs
Cap
Rotor
Coil
Map Sensor
ICM
ECM
Bypassed fuel filter to check if it was clogged

I'm thinking I need to change fuel pump, fuel filter, fuel pressure regulator but can anyone assist me on anything else that could be the problem. Very new to the Jeep world but somewhat mechanically savvy. I started with the electric items first due to being able to reset the Jeep by turning the key off then back on.

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Old 01-03-2013, 06:12 PM   #2
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Have you checked the fuel rail pressure?

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Old 01-03-2013, 06:37 PM   #3
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No, how do I do that? Is there a service port to check it?
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Old 01-03-2013, 07:20 PM   #4
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Im new at the mechanical end of things but from what I have read here could it be the cat?
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Old 01-03-2013, 07:41 PM   #5
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It very well could be the catalytic converter is clogged. Put you hand near the exhaust and see what kind of flow you have. The converter can also get very hot. Glowing red hot when clogged. Does the exhaust rattle when cold?
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Old 01-03-2013, 07:45 PM   #6
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Could be but how do you explain the reset after turning key off then back on? It just passed and the smog tech said the cat could be replaced. I guess the O2 sensor could be bad.
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Old 01-03-2013, 07:47 PM   #7
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No rattles in the exhaust. Flow seems good and I didn't see it glowing at night when I checked it.
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Old 01-16-2013, 04:42 PM   #8
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Quote:
Originally Posted by pgregg88 View Post
I have a problem with my 1989 Jeep Wrangler 2.5L with 5 speed manual trans. When I first got the Jeep I drove it for a few months and didn't really notice any problems because I was only going 10-15 miles at a time. I decided to take a trip about 40-50 miles and that's when it started bogging down, stumbling and losing power. This problem got progressively worse along the trip. Now I can only go a mile or two before it starts to act up. I can shut the key off and back on and it seems to reset whatever the problem is for a short period of time. Things I have replaced are as follows...

Plugs
Cap
Rotor
Coil
Map Sensor
ICM
ECM
Bypassed fuel filter to check if it was clogged

I'm thinking I need to change fuel pump, fuel filter, fuel pressure regulator but can anyone assist me on anything else that could be the problem. Very new to the Jeep world but somewhat mechanically savvy. I started with the electric items first due to being able to reset the Jeep by turning the key off then back on.
I had the same problem and changed all the same things. I finally took it to the shop. It had a bad Fuel Pump and a Vacuum leak. I know the fuel pump is in the tank but I do not know where the vacuum leak was coming from, but it is running like a champ now.
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Old 01-16-2013, 05:01 PM   #9
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My cat is clogged made me lose a ton of power. i just wanna cut the darn thing off.
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Old 01-16-2013, 09:35 PM   #10
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I had the same problem on my 92 and it turned out to be the O2 sensor was bad. Check engine light did not come on but I checked for trouble codes anyway and found 2 O2 sensor codes. Replaced sensor and all is well.

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