98 TJ, Intermitent power loss... HELP!!! - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 01-12-2004, 02:24 PM
TealJeep
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98 TJ, Intermitent power loss... HELP!!!

98 TJ/4.0 with 95K miles. Has been working fine. About 1 yr ago I started to have a strange problem, at highway speed it would suddenly quit excelerating, it would not die just not go forward. I would pull over for maybe a minuet and then drive on. It never left me stranded untill last week. I had to drag it home. I am thinking the fuel pump, however some one said to check the catalytic converter. Any thoughts? No check engine light.

Don.
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post #2 of (permalink) Old 01-12-2004, 03:59 PM
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Re: 98 TJ, Intermitent power loss... HELP!!!

please provide us with just a little more information. When it would slow down on you was it under hard accel. Or just normal driving.
From what you have mentioned, I would say you would be wise to check your fuel filter. If the fuel pump was bad your jeep wouldn't run at all. But what you describe sounds like text book old filter.
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post #3 of (permalink) Old 01-12-2004, 04:48 PM
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Re: 98 TJ, Intermitent power loss... HELP!!!

Well the other day it was at highway speed, no increase in acceleration. However when I finally tried to limp off the highway, I could start my Jeep, it would idle fine, then when i tried to give it gass it would bog, no matter what the input, full throttle, partial throttle, or feathering the throttle. I tried all I could think of, please note that this morning after having sat for a few days I drove it around my parking lot. I wonder if this has to do with operating temp, so again back to the converter? I did not spell check this time sorry...
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post #4 of (permalink) Old 01-12-2004, 05:26 PM
 
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Re: 98 TJ, Intermitent power loss... HELP!!!

Sounds like it could be an O2 sensor, but that normally trips the check engine light. maybe run the scan anyway to see if the light is just not coming on

Phil
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post #5 of (permalink) Old 01-12-2004, 06:01 PM
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Re: 98 TJ, Intermitent power loss... HELP!!!

O2 sensor? Why? Would you mind elaberating...
Thanks,
Don
post #6 of (permalink) Old 01-12-2004, 06:05 PM
 
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Re: 98 TJ, Intermitent power loss... HELP!!!

Sounds like the fuel filter to me, also.

Ken Linzmeyer
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post #7 of (permalink) Old 01-12-2004, 07:13 PM
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Re: 98 TJ, Intermitent power loss... HELP!!!

Fuel filter!

Even if were wron its cheap insurance




Wheel on!




post #8 of (permalink) Old 01-12-2004, 07:17 PM
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Re: 98 TJ, Intermitent power loss... HELP!!!

Another idea. Bang your exhaust, any rattling inside, especially around the muffler could mean an internitent blockage. If its OBDII then your cat or O2 would trip an instant check engine lite.





Wheel on!




post #9 of (permalink) Old 01-12-2004, 10:20 PM
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Re: 98 TJ, Intermitent power loss... HELP!!!

Ditto, fuel filter. Put a bottle of STP fuel treatment in the tank too.
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post #10 of (permalink) Old 01-12-2004, 10:29 PM
 
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Re: 98 TJ, Intermitent power loss... HELP!!!

I agree it should trip the computer,

as for why, if the o2 sensor isnt working, then the computer is getting incorrect readings about the lean/richness of the fuel air mixture, causing the symptoms that you are stating. The only reason i mentioned it is my wifes vehicle had the same problem, changed the o2 sensor and no problems.

Phil
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