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Old 03-31-2011, 05:06 PM   #1
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Question Strange problem today... any help/ideas?

Has anyone else had this happen?

This morning on my way to work, I left the last trafic light before the entrance to the highway, I was first in line on the right hand side of 3 lanes and just pulling up to the light when it went green, I had already downshifted, so when the light went green I just gave it gas and went through the light, I needed to be the next lane over so I put on my blinker to switch lanes and the car in that lane tried to speed up to block me, so I gunned my Jeep (2003 Rubicon) and was able to get in front and switch lanes, Jepp was running fine, but when I hit the on ramp, while accelerating in 5th gear up the ramp, right as I got to the top and was about to merge my Jeep lost all forward acceleration, the more I pressed the gas the worse it got. I down shifted into 4th gear and if I barely pressed the gas pedal it ran smooth, but was still slowing down... I was finally able to merge onto the highway, but it felt like me Jeep was running out of gas even though my gauge said I had almost half a tank. I nursed the pedal to keep it moving and got off at the next exit, and back on the street it felt like it was running normal again.

I drove it to my work parkinglot and worked all day, then after work i hit a gas station to see if my gas gauge was messed up, but it only took 9 gallons to fill it up... It drove fine all the way home this evening...

Anyone else ever have this happen? Any Ideas as what caused it or how to prevent it from happening again?

Thanks!

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Old 03-31-2011, 05:19 PM   #2
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No codes or CEL?

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Old 03-31-2011, 05:28 PM   #3
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My '90 I6 will do that. I replaced the alternator and belt, hopefully that fixes the problem.
Good Luck.
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Old 03-31-2011, 06:18 PM   #4
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No codes or CEL?

The check engine light never came on. It felt like I was out of gas and running on fumes...
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Old 03-31-2011, 06:19 PM   #5
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My '90 I6 will do that. I replaced the alternator and belt, hopefully that fixes the problem.
Good Luck.

Did that fix your problem or does it still do it?
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Old 03-31-2011, 06:41 PM   #6
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Sounds like you sucked something into your fuel line, maybe a pluged fuel filter... you gased it and then the problem started. Unless you knocked somethin loose.. should be in the fuel system
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Old 03-31-2011, 06:55 PM   #7
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Go out and gas it again.. if it does it again check for a pinched fuel line . it will be fine until you gun it, at that point it sucks the fuel line dry, which is why it seems like you're running out of gas.. after it sits or is driven under normal conditions the line fills back up. maybe pinched just enough that it won't feed under heavy throttle
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Old 03-31-2011, 07:29 PM   #8
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Sounds like you sucked something into your fuel line, maybe a pluged fuel filter... you gased it and then the problem started. Unless you knocked somethin loose.. should be in the fuel system
I did some research "googled my problem" today at work, and it said my fuel filter was built into my fuel pump in the tank... most cars have a filter in the tank, but I'm wondering if there is a second filter outside the tank I can change?
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Old 03-31-2011, 07:31 PM   #9
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Go out and gas it again.. if it does it again check for a pinched fuel line . it will be fine until you gun it, at that point it sucks the fuel line dry, which is why it seems like you're running out of gas.. after it sits or is driven under normal conditions the line fills back up. maybe pinched just enough that it won't feed under heavy throttle
I kept gassing it all the way home this afternoon, but couldn't make the problem reappear... but that was after I topped off the tank...
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Old 03-31-2011, 07:48 PM   #10
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Hard to say, sometimes there's will be a second filter sometimes not. You would have to trace your lines to see.

Most newer cars, trucks, jeeps. What ever it is have the filter built into the pump, if it goes out your screwed and have to drop the tank to replace it. At this point you might as well spend the 200+ for the pump as well just so you don't have to do it again later. True they don't seem to go out as much but it makes it really hard to diagnose when a problem starts. Not sure if they still use the charcoal stile filter or not but when these go out they plug everything up with it.

Best I could say is look for a pinched line especially if you have lifted it. Other then that follow your fuel lines along the frame rail and look for another filter, do so all the way to where it feeds off to you injecters.

The really bad part is the fuel pumps will try and cut out on you when they go bad, they usually don't just quit when there done. Drive it for a awhile and see what it does. May have just been a fluke, if it does it again then you may wanna check into the goodies inside your tank. Good luck, there not cheap or easy to fix. Not really hard either, just a lot of work
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Old 03-31-2011, 07:53 PM   #11
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Oh and when it starts running low, say half a tank again and starts cutting out fill it back up to see if it stops. If it does run it back down and see if it starts again.

Or if it cuts out after turning a corner?

If it starts doing these things then you probably have a hole in the pick up tube

Just something else to keep in mind or to look out for.

That's what I mean by it can be a pain to figure out. Just run it for awhile and if it does it again take close note as to what you were doing when it happened.
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Old 03-31-2011, 08:18 PM   #12
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I had an old Volvo that did that; it turned out to be the cat. Everything had broken loose inside and blocked the exhaust. I was on the highway and slowly lost speed until I could barely hold 50 mph. I pulled over to check for loose plug wires or some obvious cause, but everything looked fine. Got in and started it up and it ran fine.
Do you hear any rattling from the tailpipe? That is a good sign of a bad cat
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Old 03-31-2011, 08:19 PM   #13
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Originally Posted by necromancer_tat View Post
Has anyone else had this happen?

This morning on my way to work, I left the last trafic light before the entrance to the highway, I was first in line on the right hand side of 3 lanes and just pulling up to the light when it went green, I had already downshifted, so when the light went green I just gave it gas and went through the light, I needed to be the next lane over so I put on my blinker to switch lanes and the car in that lane tried to speed up to block me, so I gunned my Jeep (2003 Rubicon) and was able to get in front and switch lanes, Jepp was running fine, but when I hit the on ramp, while accelerating in 5th gear up the ramp, right as I got to the top and was about to merge my Jeep lost all forward acceleration, the more I pressed the gas the worse it got. I down shifted into 4th gear and if I barely pressed the gas pedal it ran smooth, but was still slowing down... I was finally able to merge onto the highway, but it felt like me Jeep was running out of gas even though my gauge said I had almost half a tank. I nursed the pedal to keep it moving and got off at the next exit, and back on the street it felt like it was running normal again.

I drove it to my work parkinglot and worked all day, then after work i hit a gas station to see if my gas gauge was messed up, but it only took 9 gallons to fill it up... It drove fine all the way home this evening...

Anyone else ever have this happen? Any Ideas as what caused it or how to prevent it from happening again?

Thanks!
check pressure on the fuel pump and fuel pump relay
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Old 03-31-2011, 08:50 PM   #14
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The '03 Rubi's only fuel filter is in the tank. There are huge so they don't usually need replacing.

But - it sounds to me like your coil rail is starting to go away. Often that's a sign they are failing inside.

It'll get worse.
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Old 04-01-2011, 11:02 AM   #15
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I had a similar experience with my '97 Jeep. For a couple of weeks there was a "death rattle" from the catalytic converter, then one day the pieces broke loose and clogged the exhaust. It would drive fine around town, but the higher the speed, the worse it got. Eventually it wouldn't drive around town, either. Give the cat a good tap and see if it sounds like a maraca.

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I had an old Volvo that did that; it turned out to be the cat. Everything had broken loose inside and blocked the exhaust. I was on the highway and slowly lost speed until I could barely hold 50 mph. I pulled over to check for loose plug wires or some obvious cause, but everything looked fine. Got in and started it up and it ran fine.
Do you hear any rattling from the tailpipe? That is a good sign of a bad cat
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Old 04-01-2011, 11:11 AM   #16
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x2 on the cat-had similar issues myself. From what I have heard not to many people have issues with fuel pump, fuel delivery, clogged lines, etc. Could be either one of the 2 suggestions but would lean more toward the cat. How many miles on the clock? If not "high" would lean even more towards cat-I replaced mine at 87k.
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Old 04-01-2011, 11:19 AM   #17
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Easy to verify a plugged CT.

Put a vacuum gauge on manifold vacuum port. Drive it - when it bogs look at the gauge - a plugged cat will show as super low vacuum. An ignition problem will be slightly low or normal vacuum.
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Old 04-01-2011, 11:22 AM   #18
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I know the sound of that rattle lol I hear it everytime I hit a bump. Hasn't pluged my exhaust yet, hadn't realised people had issues with that.. so if my rattle stops then time to worry lol,
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Old 04-01-2011, 11:44 AM   #19
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on most cars its not so much a filter as a strainer. it keeps any sediment that builds up in your tank or rust from entering the fuel line. it doesnt remove nearly as fine of particles as the filter itself.

Quote:
Originally Posted by necromancer_tat View Post
I did some research "googled my problem" today at work, and it said my fuel filter was built into my fuel pump in the tank... most cars have a filter in the tank, but I'm wondering if there is a second filter outside the tank I can change?
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Old 04-01-2011, 11:46 AM   #20
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the easiest sign of a cat going bad on your exhaust is the smell. you should smell sulphur, like a rotten eggs smell if its plugged and burning inside.
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Old 04-01-2011, 01:43 PM   #21
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Oh, yeah. I forgot about the stench. It was quite unforgettable...


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the easiest sign of a cat going bad on your exhaust is the smell. you should smell sulphur, like a rotten eggs smell if its plugged and burning inside.
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Old 04-01-2011, 03:23 PM   #22
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I drove my Jeep to work this morning with no problem, and home from work again with no problems, it has 78k on it for miles, I don't here anything rattling when I drive, but I haven't actually tapped on the cat itself yet... no egg smell though, I'm gonna drive it till it falls under half a tank again and see if the problem repeats again since it's not doing it now, then if it does it again I think I might have a fuel pick up problem like someone suggested.
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Old 05-21-2011, 09:14 PM   #23
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ok, now that I've had the Jeep a few months, I've ran several tanks of gas through it and only had the problem crop up one other time. I had just fueled up and the tank was all the way full, I pulled out the gas station and headed around the corner to my house. As I was about to pull out onto the street from the gas station exit all of a sudden the rpms dropped way down and the jeep started to sputter and run rough. I pulled out onto the road and it would barely accelerate, I turned the corner and pulled over, shut the jeep off, then restarted it and it ran perfectly. I haven't had any problems since then.

Anyone have any ideas?
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Old 05-21-2011, 09:29 PM   #24
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ok not sure if you fixed the problem cuz im to lazy to read but here a suggestio that i had happen to me. when i was at a stop light i accelerated when it turned green and it seemend like i was putting out of gas lik i would stall then it would go then stall. i turned her off and let her sit when i turned her on she ran fine for about thirty miles to my dads auto shop.
come to find out my chick had fell off the mount and melted check to make sure its still good. cuz you will run fine then it will happen again then you will be ok again
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Old 05-21-2011, 10:26 PM   #25
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ok not sure if you fixed the problem cuz im to lazy to read but here a suggestio that i had happen to me. when i was at a stop light i accelerated when it turned green and it seemend like i was putting out of gas lik i would stall then it would go then stall. i turned her off and let her sit when i turned her on she ran fine for about thirty miles to my dads auto shop.
come to find out my chick had fell off the mount and melted check to make sure its still good. cuz you will run fine then it will happen again then you will be ok again
your "chick" had fell off what mount? your girlfriend fell out the jeep? I don't get it, lol
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Old 05-21-2011, 10:53 PM   #26
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your "chick" had fell off what mount? your girlfriend fell out the jeep? I don't get it, lol
wow sorry i was alittle pissed when i wrote that. and yes sometimes i wish she would fall out of my jeep.

i meant to say my chip fell and then melted
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Old 05-21-2011, 11:13 PM   #27
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wow sorry i was alittle pissed when i wrote that. and yes sometimes i wish she would fall out of my jeep.

i meant to say my chip fell and then melted
That kinda makes more sence, lol What chip are you refering to? where's it located, and how do I check and make sure mine isn't doing the same thing?
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Old 05-21-2011, 11:26 PM   #28
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im not sure on the exact name of the chip. ill post a pic of it tomorrow before i go wheeling or then again maybe after who knows. but ill get back to you.
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Old 05-21-2011, 11:30 PM   #29
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im not sure on the exact name of the chip. ill post a pic of it tomorrow before i go wheeling or then again maybe after who knows. but ill get back to you.

Cool deal, thanks! The randomness of it is what makes it hard for me to figure out... But it's also what makes it kinda dangerous... the first time it happened I was trying to merge onto a busy highway and instead of accelerating my Jeep was slowing down... I barely managed to merge without causing a wreck, and then everyone had to drive around me until I got off at the next exit...
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Old 05-21-2011, 11:34 PM   #30
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yea i stared stalling in the middle of an intersection in which i was turning left when there was oncomming traffic

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