loss of power - JeepForum.com

 
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post #1 of 12 Old 10-21-2003, 11:04 PM Thread Starter
echoes
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loss of power

Need help. My Jeep, after driving it on the highway for about 10 minutes, will start to lose power. It seems as if there is no gas getting to the engine but, there is no sputtering. It idles fine but when I try to take off again it loses power. I'm thinking it is either the fuel pump or the coil. I think I smell something burning but the smell is very week. Also, I took it to the shop and had it hooked up to the computer and they said they found no errors. Any ideas on what it could be

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post #2 of 12 Old 10-22-2003, 07:26 AM
joeyprice
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There seems to be a lot of this going around. There are quite a few possible causes discussed here.
I'd start with teh 02 sensors and then start throwing darts.

http://www.jeepforum.com/forum/f9/sensor-problems-again-54685/
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post #3 of 12 Old 10-22-2003, 08:16 AM Thread Starter
echoes
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o2 sensors have already been replaced. So has the TPS.
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post #4 of 12 Old 10-22-2003, 09:16 AM
nxsTJ28
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I was having a similar problem only it would happen after driving for about an hour. I changed the O2 senor and the problem still occurred. After that I reset the computer (because I forgot to do so when I replaced the O2 sensor) while I took the distributor cap off and cleaned the rotor. I made a two hour trip without any problems.

I've also read that someone had a similar problem and it turned out to be their fuel sending unit was getting hot and sucking up air.???

I like what someone said above, just start throwing darts.

Good luck.
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post #5 of 12 Old 10-22-2003, 10:52 AM
blk97tj
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Quote:
Originally Posted by echoes
Need help. My Jeep, after driving it on the highway for about 10 minutes, will start to lose power. It seems as if there is no gas getting to the engine but, there is no sputtering. It idles fine but when I try to take off again it loses power. I'm thinking it is either the fuel pump or the coil. I think I smell something burning but the smell is very week. Also, I took it to the shop and had it hooked up to the computer and they said they found no errors. Any ideas on what it could be
I'm having the same problem right now. I've read that it could be O2 sensors, fuel pump, etc. but if the O2's are bad wouldn't i get a check engine light? My light has never come one so i'm really not sure what to do about it

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4" lift on 35's
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post #6 of 12 Old 10-22-2003, 12:47 PM
nxsTJ28
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Quote:
Originally Posted by blk97tj
I'm having the same problem right now. I've read that it could be O2 sensors, fuel pump, etc. but if the O2's are bad wouldn't i get a check engine light? My light has never come one so i'm really not sure what to do about it
My light never came on and no codes posted either, however since I changed the upstream O2 sensor and reset the computer I haven't had any problems.
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post #7 of 12 Old 10-22-2003, 03:47 PM
Jim Shanks
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I want to say I read an O2 sensor can die slowly and not post any codes. It's if it senses a drastic change that it will tick off the PCM. Do you have access to a scan tool? If so try hooking it up to see if the o2 sensor(s) are failing on you. Another thought is mine run like crap when I had an exhaust leak.

Jim

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post #8 of 12 Old 10-27-2003, 10:01 AM
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alright, i just figured out that my jeep only does this when i get below half a tank of gas...would that mean that the fuel pump is going out or what?

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post #9 of 12 Old 11-07-2003, 01:05 PM
Chackbay Cajun
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Having similar problem,

My guess is that the decreased hydrostatic head from the lower fuel level is causing a weakened fuel pump to produce less pressure than is necessary to keep the fuel flow rate up.

I have a long explaination on one of my other replies....search for it if youre interested....I'm tired of typing.
later,
steve
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post #10 of 12 Old 11-07-2003, 07:17 PM
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Certainly sounds like a fuel pressure problem. It may be the fuel filter, pump, or some flow problem in the line or injectors. Just pick one and start.
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post #11 of 12 Old 07-31-2006, 01:24 PM
quigtj
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Similar Problem

I started having a similar problem. Got down to about 1/4 tank and it would just cut off. Starts right back up, but happened a couple of times more. Put gas in and it's got no problem. Like a previous post, it doesn't seem to sputter (at least not for long <1 second), so it doesn't feel like the fuel is cutting out.........

I only had to put in 15 gallons in a 19 gallon tank, so there was "plenty" of gas in there.

Thanks!

Edit: just noticed the previous post is 3 years old...funny

'97 TJ Sahara, Black, 4.0L, 5SPD, Line-x
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post #12 of 12 Old 07-31-2006, 07:58 PM
Rule303
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A lot of people notice smells when the cat goes bad.
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