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Old 09-13-2013, 09:33 AM   #1
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Jeep jolting heavy gas smell P0171

I have a 2001 2.5l , it is jolting upon acceleration in 1,2,3,4 gears at around 2k rpm. Sometimes it even jolts at all RPMs and I can't drive it. Turning it off then back on, fixes it for 2 minutes, then it goes back to jolting. When it is idle and even when driving there is a heavy gas smell.CEL code p0171, I changed spark plugs, wires, distributor cap and rotor, and oil change. Any clue what I can try, thank you!

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Old 09-13-2013, 11:11 AM   #2
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check your crankshaft position sensor. Also what is your voltage reading? I went through several CPS' before I realized my alternator had gone bad and was causing the issues.

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Old 09-13-2013, 11:18 AM   #3
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It could also be a vacuum issue, if the vacuum is leaking it could cause it to run super rich making it stutter and jolt, then misfire which would cause the P0171 because its not burning properly and that second o2 sensor then thinks its too lean.

It could also be your fuel pump, if the filter is clogged it would lean out the system and cause those symptoms.

I would start by checking for an obvious vacuum issue, then check fuel delivery. Mine was doing the same thing, I didn't get any codes but then again my CAT is gutted so the exhaust fumes would be stronger.
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Old 09-13-2013, 12:00 PM   #4
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My bet is on a bad upstream 02 sensor causing a false lean indication causing the pcm to over-richen the air-fuel mixture.
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Old 09-13-2013, 12:11 PM   #5
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Is it happening immediately or does it seem to wait for the engine to warm up.
It should function on a closed loop and not draw info from the sensors until it gets to normal running temp. If its still happening cold, I would lean more towards a non-sensor issue if it seems to run better before coming off that closed loop then its more likely a sensor causing the ECM to send the wrong info like Jerry is saying.
(In my experience, and against my stubborn opinions, Jerry is pretty much right all the time)

A great tool I have been using as of late...
https://play.google.com/store/apps/d...l.torque&hl=en
with a bluetooth ODBII reader, you can monitor voltages on the O2 sensors, see the fuel to air mix, pull real time intake and coolant temperatures.. all kinds of useful stuff along with reading clearing and looking up CEL codes.
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Old 09-13-2013, 07:34 PM   #6
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Thanks everyone for the answers. I did not get a chance to look at my Jeep today. But I am going to try over the weekend. I will keep you posted, thanks.
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Old 09-13-2013, 07:39 PM   #7
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The question of when this was happening was asked... is it happening only when your engine is cold, only when it is warmed up fully, or all the time?
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Old 09-13-2013, 07:56 PM   #8
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Oh I am sorry, I almost forgot. It always happens after the engine heats up.
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Old 09-13-2013, 07:58 PM   #9
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Ok, that is sounding more & more like a bad upstream 02 sensor. The PCM ignores the 02 sensors when the engine is cold.
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Old 09-13-2013, 08:07 PM   #10
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I will definitely put a new 02 sensor in and let you know how it goes!
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Old 09-13-2013, 08:10 PM   #11
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Install an NTK which is the OE sensor, avoid Bosch. If you buy it locally, make sure the new 02 sensor has the same connector as yours does. Not all are the same, and some 02 sensors just come with bare wires.
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Old 09-13-2013, 08:14 PM   #12
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Alright thanks for the information, I am going to do a little research now on which one I have. And see if I can find out which ones my local stores have in stock.
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Old 09-23-2013, 04:00 PM   #13
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I finally got around to changing the o2 sensor, and so far so good. Thanks Jerry andeveryone for there information.I will reply back later to let you know how its holding up
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Old 11-06-2013, 07:50 PM   #14
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did it fix the problem?
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Old 11-06-2013, 08:39 PM   #15
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Mine did not throw codes but other symptoms similar. Was the fuel pump. Fine one day, bad the next.
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Old 09-17-2014, 04:55 PM   #16
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I did not want to create another thread with the same issue. So here it goes, after I replaced the o2 sensor it worked fine for 7 months. Then I had the same problem, so I changed the o2 sensor back in April. Now this week the same CEL P0171 is appearing and the same symptoms are occurring. I am confused on why the o2 sensor fixes the problem but then appears back within a couple months. Anyone have any clues of what can be causing this. Thank you
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Old 09-17-2014, 08:02 PM   #17
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Probably a bad pre-cat, the one next to that 02 sensor. I was having repeated CELs that the previous owner said a couple 02 sensors would temporarily fix but not permanently. That pre-cat eventually failed and puked its internals downstream into the main cat, plugging it up so badly I had to pull off the freeway 75 miles from home... the engine would idle but the max speed it could be driven with the plugged cat was 5-10 mph.
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Old 09-17-2014, 08:56 PM   #18
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Thanks for the information Jerry. I am going to try and look at it over the weekend. It sure does look like a fun fix to put in a new pre-cat, haha. Going to do some more research tomorrow night.
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Old 09-17-2014, 10:19 PM   #19
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Uh oh I'm sorry I just noticed you have the 2.5L engine. I don't know if newer 2.5L engines have a precat like the newer 4.0L engines do.
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Old 09-18-2014, 03:02 PM   #20
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I'll check underneath my jeep tomorrow, as I won't be able to tonight. If there is no pre-cat, do you have any other thing I should check as to what's causing the issue. Thank you
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Old 09-20-2014, 04:26 PM   #21
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Well I was able to get underneath my Jeep today and tried doing some work. There is no pre-cat on the 2.5 like you said Jerry. I noticed the entire exhaust system had a lot of play in it. So right above the upstream o2 sensor on the head pipe I tightened the bolts up, and the exhaust did not have much play. I then read off another forum to use SeaFoam to find a leak in the exhaust. The smoke was coming out in the connection between head pipe and exhaust manifold. I am not to familiar with mechanics, other then what I read online and do little to my jeep. Is it possible the seal between the two is bad? I drove around after cleaning up and the Jeep still has the same issue. What do you suggest I do?
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Old 09-21-2014, 10:25 AM   #22
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Does anyone know what I should do? Thanks for the help
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Old 09-21-2014, 07:46 PM   #23
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Quote:
Originally Posted by GoGetEm1994 View Post
Does anyone know what I should do? Thanks for the help

Does it jerk when you drive a constant speed and the rpm's shoot up to 3 or 4K? And then you smell a rich gas smell and you either floor it or let off the gas and wait for the rpm's to go back to normal?
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Old 09-21-2014, 08:00 PM   #24
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I live in the city, so usually when i am driving around for maybe 10 minutes and come to a red light, I begin to smell the gas. Once I get the gas smell, that is when I know the issue begins. Then in every gear when it hits 2k rpm it does a brief Jerk until the rpm goes to around 2200 rpm I would guess. There is no sudden spike in the rpm.Then the jeep rides like normal above that rpm. The smell of gas is constant after that until I turn the jeep off and let it cool down.
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Old 09-24-2014, 01:04 PM   #25
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Originally Posted by GoGetEm1994 View Post
I live in the city, so usually when i am driving around for maybe 10 minutes and come to a red light, I begin to smell the gas. Once I get the gas smell, that is when I know the issue begins. Then in every gear when it hits 2k rpm it does a brief Jerk until the rpm goes to around 2200 rpm I would guess. There is no sudden spike in the rpm.Then the jeep rides like normal above that rpm. The smell of gas is constant after that until I turn the jeep off and let it cool down.

I'd try the TPS.. That fixed my problem and it sounds like you have the same symptoms.

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