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Old 05-24-2013, 02:07 PM   #1
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Engine looses power while driving and makes the Jeep jerk

Hi guys, Just got a 2000 Jeep TJ 2.5 manual.
I bought it last tuesday and the the guy that sold me the Jeep had it stored for almost 10 months, with probably 1/4 of gas in the tank and probably no gas stabilizer.. So when I went look at the Jeep he was doing a small tune up on it, like changing the spark plugs,straps et cleaning the injectors and thats about it.
When I test drove it, it had not run for the past 10 months and while I would upshift, the rpm would start going down and I could feel the engine loosing power and giving kicks, but the more I drove it the less it was doing it, I decided to buy it, since the Jeep is almost in perfect condition and I had it for a very good price. The next day before going to work I filled up the tank and notice that the Jeep was driving a lot better, almost no more kicks, maybe once or twice, yesturday It didn't do It once and today maybe one time for a few seconds.

My question is, is this a sign of a dying Jeep engine or just having water or debris in the fuel tank?

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Old 05-24-2013, 02:30 PM   #2
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Bad gas. Run a 1/2 tanks worth of gas through it with your favorite injector cleaner, fill it back up and do it again. That should cure it.

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Old 06-04-2013, 09:10 AM   #3
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Ok just to update, the jeep is still doing it an does it mainly when i pass 2000 rpm,
It is intermittant, sometimes It wont do it at all in a few days and some other days it will do it a few times, So what happens is the Jeep drives fine and especially going uphills the rpm will start dropping and the jeep will start losing power/speed and start jerking.

Should I try some body trottle cleaner? I also read this could be a clogged cat, what are you guy's thoughts?
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Old 06-04-2013, 04:18 PM   #4
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Other ideas than those 2 ?
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Old 06-04-2013, 04:30 PM   #5
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I had a similar issue to what you are describing and for me it was a combination of bad upstream O2 sensor and a bad Throttle Position Sensor (TPS). Got those two sensors replaced and it's been smooth sailing ever since. Although in my case I also had a CEL come on which told me what it was, I'm not seeing that that is the case for you.
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Old 06-04-2013, 05:02 PM   #6
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exactly i don't have any codes!
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Old 06-05-2013, 01:36 AM   #7
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If the O2 is just a little lazy it can cause this. Mine was barely slow but when I replaced it the problem was remedied.
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Old 06-05-2013, 07:05 AM   #8
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I had the same problem with my 08 Avenger. Turned out to be the distributor / spark plug wires. Fortunately it was still under warranty, so the dealer replaced the wires and I haven't had a problem since.
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Old 06-05-2013, 07:08 AM   #9
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possibly fuel filter
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Old 06-08-2013, 07:12 AM   #10
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Ok so 2 days ago decided to do some offroad, ended up getting stuck in mud, after getting pulled out, noticed that my check engine had just turned on.
Tomorow i'll be cheking the codes out, my main guess is I probably broke the 02 sensor, could a 02 sensor cause the jeep to hesitate and loose power?
Oh and by the way it's been 5 days that the jeep run's perfectly
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Old 06-09-2013, 10:20 AM   #11
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??
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Old 06-09-2013, 02:14 PM   #12
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what did your code check say?
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Old 06-09-2013, 02:19 PM   #13
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Replace all oil and coolant and new gas and put in fuel injet. Itshould be fine
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Old 06-10-2013, 11:29 AM   #14
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So I just ran the EB2 and the code that came out was P0171
System too lean bank 1
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Old 06-10-2013, 01:41 PM   #15
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just took off the air tube and I sprayed 3/4 of a can of carb cleaner in throttle body while the engine was running, took it for a ride. Still doing it.
I bought some fuel injector/fuel pump cleaner and filled up the tank, I'll see if it becomes better during the week, I checked the map and throttle sensor and they seem fine to me, Im guessing maybe a bad fuel pump.
If I can't resolve this I'll probably drop it off at my mechanic so he can have a look at it.
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Old 06-10-2013, 01:42 PM   #16
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I meant OBD-II by the way haha
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Old 06-10-2013, 01:50 PM   #17
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Sound like fuel pump to me sitting for 10 month might have done damage fuel pump who knoq
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Old 06-11-2013, 08:41 AM   #18
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I've talked to some people and they told me a fuel pump usually works or wont work at all, I'm gonna check the rotor and distributor cap
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Old 06-11-2013, 10:55 AM   #19
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For what it's worth a 98 model 2.5L had a recall issued. 1/2 of the recall was to check/replace the cat if it was rattling. The other 1/2 was to reflash the computer since some of them were not capable of detecting a bad o2 censor. I carried mine in a few months ago. They reflashed it and less than 10 minutes after leaving the check engine light came on. Needed both o2 censors replaced. It's called "E22 reprogram PCM and inspect catalytic convertor". If you send the vin information to Chrysler, they will send back all info including non completed recalls. I'm not sure if a 2000 was also inlcuded in those years.
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Old 06-12-2013, 08:58 AM   #20
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Ok so here is another update, I changed my spark plug cables, checked my spark plugs their fine, changed my distributor cap and kept the rotor since it was ok and now I get no more jerking and power loss when im upshifting, I just experienced a loss of power at 100+ km/h
What could cause the Jeep to begin loose power at high speed?

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