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post #1 of (permalink) Old 12-20-2002, 01:59 PM Thread Starter
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TJ Loosing power?

My TJ 97 2.5L 62000 mi,
I noticed that it Recently has problems maintaining 60+ Mph. I changed the air filter because it was due, and it made a diffrence in the power. It just came due for rotor and cap, so I purchased them and will put them on tonight. Any Idea what is up? My 95 did this about 75000 miles but it was the cat converter.
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post #2 of (permalink) Old 12-20-2002, 02:12 PM
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Re: TJ Loosing power?

1. The symptoms lean to a plugged Cat Converter.
2. Any difference uphill or on a straight run?
3. Lift the hood at night and see if the exhaust manifold is "glowing" a dull red.
4. Have the pressure at the tailpipe measured... if it's too low.. there's a restriction.
5. You're sure you got the right air filter?
6. Did this problem exibit itself right after the filter change?
7. Could you have bumped a wire/vacuum line during the tune up?
8. Any decrease in MPG?
9. Any tire changes?
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post #3 of (permalink) Old 12-20-2002, 05:13 PM Thread Starter
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Re: TJ Loosing power?

There is a major diffrence when going up hill, less power.

The filter is right, it actualy improved the running of the vehicle

The problem was before the filter change, and it runs fine no observed missing, or hesitation just lack of power in the higher gears.

I had not done any engine work since the last oil change over a month ago.

Cannot advise on mpg.

I changed my tires yesterday, but the problem was apparent before that, and I noticed no signifigant change after the tire replacement.

Tonight I changed the Rotor and Cap, and noticed some yellow corrosion in the cap. Cleaned it out good. Also when I changed my air filter I noticed it had a sticky substance on the filter. Kinda strange, never seen that before. Everything seems to improve the running, but still lacks the normal power top end
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post #4 of (permalink) Old 12-20-2002, 05:26 PM
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Re: TJ Loosing power?

Ever clean out the throttle body? Normally has alot of deposits once you clean that out you'll notice a huge increase of power. I've done it on all my jeeps and noticed a big improvement.
post #5 of (permalink) Old 12-20-2002, 08:59 PM Thread Starter
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Re: TJ Loosing power?

By clean out do you mean a good washdown with gum out if so I do that every other oil change. Or do you mean something more detailed?
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post #6 of (permalink) Old 12-22-2002, 02:51 PM
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Re: TJ Loosing power?

I was talking about cleaning out the throttle body... Well I searched everywhere to find a link, but its pretty straight forward... take off the Throttle Body off the intake unplug the wires going to it... Get a toothbrush and some Throttle Body Cleaner and clean all the deposits out of it let it dry bolt back on and start it up... It will idle a bit better and you should notice a difference. If I find the link I will post it. [img]images/graemlins/smirk.gif[/img]
post #7 of (permalink) Old 12-23-2002, 08:29 AM
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Re: TJ Loosing power?

Have you totally ruled out the Cat? It sure sounds to me like that is the thing. I had to replace mine in my YJ right around the same milage that you list. Is your Cat welded in, if not pull it off and take a look.
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post #8 of (permalink) Old 12-23-2002, 10:29 AM Thread Starter
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Re: TJ Loosing power?

It is welded in.

The problem seems intermitent. Last night after I got the lift done, I jumped in in to go for a ride, and It seemed normal. I ran it for about 35 miles and by the time I got back it was acting up again

I think it is the cat..
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post #9 of (permalink) Old 12-23-2002, 10:45 AM
 
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Re: TJ Loosing power?

time for a v-8 swap [img]images/graemlins/grin.gif[/img]

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post #10 of (permalink) Old 12-23-2002, 11:49 AM
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Re: TJ Loosing power?

1. When it's acting up.
2. Pull out the O2 sensor.
3. Drive the vehicle.
4. Pulling the O2 sensor will relieve back pressure in the exhaust manifold.
5. If power is restored... replace the Cat Converter.
6. I'd advice pulling the O2 sensor and putting anti-seize compound on the threads so it's easier to remove on the side fhe road.... [img]images/graemlins/frown.gif[/img]
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