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General Forums => The Mess Hall => Topic started by: 95yjzilla on April 18, 2011, 05:52:39 PM
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i have a 95 jeep wrangler with a 2.5L. i was driving it last night and it started to bog down when its at about half throttle. It idles fine. I do have low voltage in my battery. wat do you guys think it can be?
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i have a 95 jeep wrangler with a 2.5L. i was driving it last night and it started to bog down when its at about half throttle. It idles fine. I do have low voltage in my battery. wat do you guys think it can be?
it's been reported before to be TPS or O2 but of course these are assumptions, could be other things like ignition (CPS, cap, rotor, wires, plugs) or fuel delivery (pump, filter, FPR, pressure/flow) related.
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its pretty much trial and error then to really figure wat parts or parts need to be replaced
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its pretty much trial and error then to really figure wat parts or parts need to be replaced
usually you get a code, but in your case i take it the CEL did not come on. CPS would most likely give you problems at various rpm and loads, so that would narrow down the search a bit more but still - hard to tell for sure though with almost no data other than a brief description, you could start by visually checking the ignition components, then check the fuel pressure while you reproduce the issue and take it from there. You can also test the TPS output with a multimeter, should go between 0.6v to close to 5v (can't remember the range exactly) the more important thing is to have it vary the output smoothly with no jumps while you open and close the throttle, if it jumps then it's bad and that's your culprit.
If you eventually get the CEL on then check the codes.
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just re-read your initial post, you say you have low voltage at the battery (missed that the first time, for some reason i thought you meant you don't have low voltage) - what is the voltage (measured with a multimeter not your dash gauge)? does it increase with the rpm? is your alternator belt tight (no slippage)?
fix that problem first, it could be your issue.
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i had the alternator tested last night and its good. i just put the alternator back in the jeep 5 minutes ago and started it up it ran fine at reg. rpms. i let it rund for 5 minutes. the battery right now from my dash gauge says 9.5 volts. once it got to that low of voltage is sounded like it wanted to die. the fuel pump is electic and is probly not getting enough volts.
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i had the alternator tested last night and its good. i just put the alternator back in the jeep 5 minutes ago and started it up it ran fine at reg. rpms. i let it rund for 5 minutes. the battery right now from my dash gauge says 9.5 volts. once it got to that low of voltage is sounded like it wanted to die. the fuel pump is electic and is probly not getting enough volts.
at that voltage (if that is the real voltage) you will have issues with all the PCM (computer) as well, so that sounds like the problem. On 95YJ the alternator field is controlled by the PCM, so i hope it's the alternator or wiring related (field, ground or feed)
check the 2 50 Amp fuses in the PDC by the battery, if both those are blown there is no charge going to the battery.
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ok im replacing the barrtey tommorrow after work. i checked the 2 50 amp fuses and there not blown. i hope its just because i have a battery with low voltage to solve this problem
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ok im replacing the barrtey tommorrow after work. i checked the 2 50 amp fuses and there not blown. i hope its just because i have a battery with low voltage to solve this problem
I think that even if the battery is bad you would still not have 9.5v while the engine is running
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ill just a full tune up on the jeep ( new plugs, wires, fuel filter, ignition coil, and distributor cap). if tht doesnt work then new csp and tps
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battery doesnt increase when the rpms go up. and the belt is tight.
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battery doesnt increase when the rpms go up. and the belt is tight.
sounds like a charging issue rather than the battery though.
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wat could it be then other then the battery. the alternator was tested last night and it working fine
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Glad to see you made it over here. I had an alt test ok but when under load it was crapola.
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so u think its the alternator then when its under a load. i just got done changing the plugs, wires, distribitor cap, ignition coil, tps, idle control sensor, battery, map sensor. waiting for the battery to be full charged b4 starting it.
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so u think its the alternator then when its under a load. i just got done changing the plugs, wires, distribitor cap, ignition coil, tps, idle control sensor, battery, map sensor. waiting for the battery to be full charged b4 starting it.
I think it's either the alternator, the field control coming from PCM (so the wire or the control module integrated in the 'puter) or the power feed to the battery from the alternator (the 2 fuses you checked already and the cable from the alternator to the PDC). If the battery was the problem you'd still see a voltage increase when revving up the engine but you never know - so test with the battery fully charged and go from there I guess.
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ok man thanks. ill also check the ground connections also and clean the corrosion for them.
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ITS ALIVE!!!!! my jeep wrangler is alive and running well. so many new parts i had to install battery, plugs, wires, ignition coil, distributor cap, map sensor, tps, K&N cold air filter. still need to install fuel filter tommorrow. now time to sit back and relax with a nice cold beer. life is great!!!!
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jeep is still bogging down. couldnt change the fuel filter today because its pooring outside. i hope its the fuel filter thts causing the problem.
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ok so, i changed the fuel filter today after work. started the jeep to get the fuel through the new filter and clean the gas if the gas is dirty. test drove the jeep tonite after putting in the new fuel filter and idles fine. on the other hand its still spitting when driving. i can feel tht it wants to get up and go but cant because its spitting. this problem is driving me crazy!!!!!!!
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how's your voltage now?
and also, i would look at fuel pressure while driving, and although what you describe doesn't sound like it but i will mention it anyway (just in case your explanation is not getting thru to me right) could maybe the cat be plugged?
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battery voltage is 12.8 volts
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how's your voltage now?
and also, i would look at fuel pressure while driving, and although what you describe doesn't sound like it but i will mention it anyway (just in case your explanation is not getting thru to me right) could maybe the cat be plugged?
Had the Plugged cat on my 94. Was pissed and was laying under the jeep thinking, so i kicked the cat it rattled. Pulled the cat and put on a cheap one problem was gone. Have since just removed the cat. Found out it would have been replaced under warranty if I would have taken it in.
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im gonna put fuel injecter cleaner in my tank to clean the injecters just incase there dirty. i mine as well just make a new exhaust for my 95 yjzilla....lol.
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just did a commpression test and eveything is good there. 2 of my pistons r a little low but nothing to bad to worry bout. also checked the cat and its not plugged. can feel the burst of exhaust air coming out of it. still looking for the problem.
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just did a commpression test and eveything is good there. 2 of my pistons r a little low but nothing to bad to worry bout. also checked the cat and its not plugged. can feel the burst of exhaust air coming out of it. still looking for the problem.
you can still feel exhaust coming out, it's during load that matters (i had the same problem at some point) - i'm not saying that's it but i had the cat plugged at one time and was still getting exhaust coming out thru the tailpipe but under load/acceleration would just act like there was a limiter on it and not go over a certain speed (and had to baby the pedal to get it up to speed, if i floored it was dying).
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thts pretty much wat my jeep is doing. i had my friend put his hand in front of the tailpipe and reved the jeep up and he could feel exhaust coming out. it does feel like there is a limiter when i get to a certain speed and under acceleration. i do have to baby the pedal. a few of my friend have jeeps and say tht it could be my fuel pump thts on its way out.
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thts pretty much wat my jeep is doing. i had my friend put his hand in front of the tailpipe and reved the jeep up and he could feel exhaust coming out. it does feel like there is a limiter when i get to a certain speed and under acceleration. i do have to baby the pedal. a few of my friend have jeeps and say tht it could be my fuel pump thts on its way out.
well, the pump was my thought too, that's why i mentioned checking the pressure while driving. Or if you can take the cat out and put a pipe in for a test around the block that could rule out (or confirm) if it's the cat.
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thts pretty much wat my jeep is doing. i had my friend put his hand in front of the tailpipe and reved the jeep up and he could feel exhaust coming out. it does feel like there is a limiter when i get to a certain speed and under acceleration. i do have to baby the pedal. a few of my friend have jeeps and say tht it could be my fuel pump thts on its way out.
When Mine did it it was never at the same speed and time. see the cat material inside was broken loose and was moving around. Just sitting and reving it no problem worked great. But while going down the road it would turn and completly plug the exhaust. Slow down and it would fall back out and run good for a while.
As I said I kicked it and heard the material rattle around.
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Check the surface temp of the cat at the front and the back and make note of the variance. I believe some variance is normal, but a lot could mean it's getting clogged, or is clogged already.
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Take your Jeep out on the road and run it where it bogs down for a minute or so, then shut the ignition off and coast to a stop, let it cool down a bit and pull your sparkplugs... let us know how they look. Also, how is your gas milage and how did your old plugs look when you pulled them?
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its bogging down when i accelerate more to shift like its not gettin enough fuel or the fuel injecters are dirty. the old plugs needed to be changed. they had 173,000 miles on them. for gas mileage i dont know wat im getting per mile. i have 4:10 gears with 35 x 14.50 tires. its a 15 gallon tank. im changing the fuel pump in it tonite but not droppin the tank. im goin to cut a square in the floor over the fuel pump and change the fuel pump tht way instead. i just need to know if theres any wires that are in that general area b4 cutting away.
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its bogging down when i accelerate more to shift like its not gettin enough fuel or the fuel injecters are dirty. the old plugs needed to be changed. they had 173,000 miles on them. for gas mileage i dont know wat im getting per mile. i have 4:10 gears with 35 x 14.50 tires. its a 15 gallon tank. im changing the fuel pump in it tonite but not droppin the tank. im goin to cut a square in the floor over the fuel pump and change the fuel pump tht way instead. i just need to know if theres any wires that are in that general area b4 cutting away.
it's lot easier to drop the tank, you will have to seal that hole well or you'll have fumes in you car from the exhaust, not to metion cutting the tub.
there are wires that go to the fuel pump and fuel level sender. There are also hoses and fuel lines and also the tank is pretty close to the tub so you need to be careful.
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i do understand that there are wires and lines that go to the fuel tank itself. im lookin to see where they are on google b4 i do cut into the tub.
http://www.jeepforum.com/forum/f12/93-yj-fuel-pump-replacement-via-floor-access-panel-1195157/
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I'd just drop the tank as well. It's not that hard and comes out easily if you have a floor jack. It's really easy if you don't have a full tank. I dropped my tank when I swapped the skid plate.
I think jfrabat had some pics of the top of his tank when he dropped it.
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Is the bogging down a recent developement? Did you do or change anything at the time you started having the problem? Have you tried using a fuel pressure gauge to see if the pump is providing proper pressure? Have you also checked the fuel pump for proper volume output? Have you checked that your O2 sensor is working properly? Is your distributor worn?
Performing the test I described earlier about running the engine in the range that it's having problems, shutting it down abruptly then reading the plugs helps troubleshoot if you're having a fuel delivery problem or not... using test equipment and gauges help troubleshoot problems too... or you can just keep throwing parts at you Jeep, in hopes that something will fix it.
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my jeep started bogging down when i got gas bout 3 weeks ago. it was running fine till i got gas from cumbys. ever since then its been running like somebody put a limiter on my jeep so i cant go fast at all. when im driving my jeep and give it more throttle it spits and spudders but feels like it wants to get up and go. my jeep did need a tune up by changin the plugs, wires, distribitor cap, ignition coil, throttle position sensor, map sensor, and fuel filter. it still feels like there is a limitor on my jeep like theres not enough fuel to where it needs to go. it has to be the fuel pump itself or fuel injecters are dirty and clogged up.
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Try running some Seafoam through it. But if you have to change the fuel pump. I also agree with just dropping the tank. It really is no big deal as long as you get the gas out first.
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You've now answered your own question about why your Jeep is bogging down, you got bad gas. Replacing a bunch of parts doesn't fix the fact you have bad gas. My advice would be to drain that stuff out into a gas can, use it for your lawnmower or something else that doesn't care about fuel quality, dump a bottle of fuel drier in your tank to take care of any residual water (HEET or some similar product), and fill up with some good quality gas. Change your fuel filter again after you run the good tank of gas through.
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A fast and eay way to check the converter is to just loosen the two bolts connecting the exahast pipe to the manifold and letting the exahast excape there. Take it for a drive and see what happens. If no difference just tighten the bolts back up and look elsewhere. But it sure sounds like a bad converter.
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My jeep usually fires right up and one time i got bad gas and had to pump the pedal just so it would start. Then it started bogging like u describe and a can of sea foam later it was running just fine so i would try that before taking that fuel pump out. Good luck
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omg im bout to just sell my jeep right bout now....ahhhhh!! sill have to baby the pedal while drivin it. went to fill the gas tank and put injecter cleaner and drop it round for a lil bit and now its running even worse than it was. i cant even get my battery to charge because i cant get over 2000 rpm's the to charge it by the alternator. my last solution is to take it to a shop and have them deal with it because i dont even wanna get even more fustrated with it.
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Sorry about your luck man keep us posted.
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i think ive figured out wats wrong with my jeep. its either fuel, timing, or exhaust. will keep u guys posted
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Its the Cat just like I've said.
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i think ive figured out wats wrong with my jeep. its either fuel, timing, or exhaust. will keep u guys posted
if you add the intake then that's all there is :lol:
good luck with the troubleshooting, keep us in the loop
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alright. so i had a fuel sample tested for me and wat do u know...water in the gas tank. jeeps goin to my friends dads shop tommorrow and seperating the gas from water and gettin any dirty from the bottom of the tank. new exhaust comes in about a week and throttle body spacer.
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alright. so i had a fuel sample tested for me and wat do u know...water in the gas tank. jeeps goin to my friends dads shop tommorrow and seperating the gas from water and gettin any dirty from the bottom of the tank. new exhaust comes in about a week and throttle body spacer.
it's good that you clean your tank, but that's most likely not your problem, water and gasoline won't mix
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wat do u means tht might not be the problem? thats gotta be the problem.
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ok so i finally found the problem with why my jeep wasnt running right. the fuse for the alternator blew so the alternator was workin overtime and not charging right. also hollowed out the cat and changed the rotor under the distribiter cap. yjzilla is alive!!!
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Ok fuze blew so the Alt would not be working at all, I may be wrong.
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there are 2 fuses for the alternator, so if 1 of them was good then you were fine, if both of them were out then the alternator wouldn't be working at all
seems that it was the cat all along, but i don't think anyone here would agree with hollowing out the cat, you should do it right and spend $50 on a new cat.
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if one of the two fuses blows then you dont get full voltage from the alternator. i know from personal experience, it'll still run, just wont have full voltage
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if one of the two fuses blows then you dont get full voltage from the alternator. i know from personal experience, it'll still run, just wont have full voltage
you're wrong, trust me
it's a circuit that is supposed to be able to handle 2x50amps = 100 amps from the alternator to the battery (logical flow of the current when charging) and the loads in the circuit (what consumes electricity like your stereo or headlights and such). it has nothing to do with voltage, it's the max current that the alternator can push thru that circuit (the load on the alternator, so 1 fuse means 50 amps, both fuses 100 amps) and if you're below 50 amps you're fine with only 1 fuse, once you're over 50 amps the fuse will blow and you're on battery (the alternator won't provide anything, would be disconnected from the circuit).
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ok that makes since. i didnt think of it like an over load protection of sorts, i always thought they both needed to be good. as i popped one one time and had to drive my jeep as i had no other vechicle. the whole time i was driving it my meter was well below the 12 volt mark.
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ok that makes since. i didnt think of it like an over load protection of sorts, i always thought they both needed to be good. as i popped one one time and had to drive my jeep as i had no other vechicle. the whole time i was driving it my meter was well below the 12 volt mark.
hmm, maybe they were both blown, i can't see a scenario where would only be 1 fuse blown unless both went out and you replaced just one of them
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the alterator wasnt workin at all because the fuse was blown which means tht everything was running off the battery
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i popped one fuse changing my oil pressure switch with out the tool. my crescent wrench touched the battery post on the alternator so it made an arc and blew the one fuse
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i have a 95 jeep wrangler with a 2.5L. i was driving it last night and it started to bog down when its at about half throttle. It idles fine. I do have low voltage in my battery. wat do you guys think it can be?
I had the same problem in my 95 too, after changing air filter, battery, and spark plugs, it turnes out the catalytic converter was boken on the inside although you couldn't hear any rattles, well I changed it for a magnaflow from my local parts store and threw it on and problem solved
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wat do u means tht might not be the problem? thats gotta be the problem.
i missed this one - what i meant was that if water in gasoline was your problem then it won't idle at all (which from what you describe was idling just fine) - they don't mix so the water will sit on the bottom of the tank, unless you have enough in there that it sits above your pump pickup and in that case won't even start.
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mine had the same symptoms a couple years ago on the way to work, all of sudden wouldnt accelerate, then it suddenly would, with a massive back fire, i figured either my cat fell apart inside and was blocking exhausr flow or my muffler fell apart inside and was blocking exhaust flow. either way, after it didt that it drove fine, finally replaced the cat and muffler, drives even better now
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mine had the same symptoms a couple years ago on the way to work, all of sudden wouldnt accelerate, then it suddenly would, with a massive back fire, i figured either my cat fell apart inside and was blocking exhausr flow or my muffler fell apart inside and was blocking exhaust flow. either way, after it didt that it drove fine, finally replaced the cat and muffler, drives even better now
I had similar symptoms a couple of times, and both times it ended up being the coil...