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Old 04-01-2011, 12:53 PM   #1
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Continued Hesitation

I started to accelerate, and shift into 2nd gear and there was some hesitation, and sputtering. I just replaced the spark plugs, cleaned out the throttle body, which was extremely dirty. Checked air filter, which was very clean, and I ended up discovering that the wire to the fifth spark plug was mis-firing. I went ahead and replaced the ignition wires as well. I also replaced the distributor cap, and rotor. It began running perfectly!! After going through all of that, which I was going to do anyways, it started doing it again, but this time, I realized that recently I have had to park it on an incline. Now...when I back out, and take off it acts up!! My question is this: Is it the incline that is making it act as if it is starving for fuel, or is that even possible? After a short time on level ground, it runs perfectly fine. My Dad mentioned a possible vapor lock. I have been thinking about replacing the fuel filter next, but I wanted to get some more opinions/input about this issue before I did that. Thanks...

Matt

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Old 04-05-2011, 01:40 PM   #2
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Hello? Maybe just a little help??

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Old 04-05-2011, 03:00 PM   #3
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your fuel pump is probably going out and needs to be replaced, which is where your fuel filter is at. I know a few people that have had the same problem on their wranglers and it ends being that the fuel pump is dieing
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Old 04-05-2011, 03:04 PM   #4
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^ What he said. Sounds like a fuel problem to me. If not the pump, maybe the pickup at the bottom of the tank.
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Old 04-05-2011, 03:16 PM   #5
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Okay...Thanks a lot. I figured it was something fuel related, but I just wanted some experienced/educated answers!! Thanks...\m/ \m/
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Old 04-05-2011, 04:18 PM   #6
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How much does a fuel pump run these days?
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Old 04-05-2011, 04:24 PM   #7
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I have the same problem also my jeep keeps blowing the fuel pump fuse and is currently not running because of that fuse I put a new 1 it starts and is at high idle then pops the fuse n turns off
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Old 04-05-2011, 05:45 PM   #8
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Hmmmm?? Gotta get this looked at for sure!! It only does it 1 time...then it runs fine for the rest of the day.
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Old 04-05-2011, 06:34 PM   #9
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Buy a fuel pressure tester at harbor freight for $20 bucks for piece of mind before you drop the money on a new pump and perform the job, it's well worth the money I have one myself
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Old 04-05-2011, 07:22 PM   #10
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Okay...Thanks!!
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Old 04-06-2011, 09:14 PM   #11
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Okay...Thanks a lot for the advice. I think I'm gonna start @ the fuel filter, then proceed from there if necessary. Are they pretty easy to access?
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Old 04-06-2011, 09:18 PM   #12
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Fuel filter is built into your pump so you need to drop the tank either way. Personally I'd still check fuel pressure because it *could* be something else
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Old 04-06-2011, 11:57 PM   #13
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Yes start simple n let me know how it goes I'm in the same boat as u let us know how this goes thanks
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Old 04-07-2011, 02:19 AM   #14
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Also, if you happen to have the 15 gallon limit this is the perfect opportunity to remove it's limiting hose (not the one with the ball) and make use of the 19 gallons all jeep tanks can hold. (15 gallon tank restriction is only possible on 97-99 wranglers)
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Old 04-07-2011, 10:11 AM   #15
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Hey Thanks!! I'll look into that.

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Old 04-10-2011, 12:14 PM   #16
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Is there any advantage to use the full 19 gal. Or is it just a gain in gallons
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Old 04-25-2011, 02:11 PM   #17
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Now it's idling rough, and the idle goes up and down!!
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Old 04-25-2011, 04:18 PM   #18
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Did you check the fuel pressure yet? It could be because of dying fuel pump.
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Old 04-25-2011, 05:12 PM   #19
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I have almost the same problem with my jeep. Recently I have been parking my jeep on an incline at work. Mine starts up fine, then after awhile of driving at 60-70 as soon as I come off the gas it starts hesitating and jerking a bit. I had mine to the dealer to look at it. They test drove it, the damn thing didnt do it. (that was friday) Today it did it again then levels off. Seems to start when im either going up a slight incline on the highway or slowing down and then accelerating again. The dealer wants 467.00 for the part, AZ wants 212.99, Napa wants 299.99
Mine jeep is a 2000 though.
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Old 04-28-2011, 09:20 AM   #20
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Seem to be having a similar problem. Slight hesitation around 2,200 rpm when going up hill. 2002 4.0L, 125,000 miles. Probably need to change the battery and spark plugs, been years on both.
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Old 05-11-2011, 09:19 AM   #21
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Looks like I'll be replacing the whole Fuel Pump assembly!! The "Lifetime" fuel filter that my TJ has, is actually nothing more than a strainer. Hmmmmm?
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Old 05-11-2011, 10:04 AM   #22
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Quote:
Originally Posted by BuckNutz1070 View Post
Now it's idling rough, and the idle goes up and down!!
the up and down idle sounds throttle body related since you removed it to clean it. Make sure everything is seated and tightened properly
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Old 09-05-2011, 10:59 AM   #23
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Well...found out what the problem is. I finally took it to a Jeep Dealership, and after a few times taking it to them, because it would never act up. It was determined that the valve springs are sticking, which according to them, that would explain the hesitation and rough idling. So...they went ahead and treated the upper engine with a high quality type of solvent. They had the ending running and pour this solvent into the engine until it completely died. They let it sit for about 4 hours. It actually worked for a long time, but now it has started acting up again, but very much less frequently. So...if it in increases in frequency, then I will probably have to have the valve springs replaced, which will run me approx. $200.00 +. So...if anybody else has the same problem with heir Jeep...this is something to look at. Thanks for everyone's input...\m/ \m/

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Old 09-05-2011, 02:43 PM   #24
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Sounds like seafoam/top engine cleaner
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Old 09-05-2011, 03:31 PM   #25
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Not exactly sure what it was...but I have run 2 bottles of Sea Foam through my engine with no success. I have added it to my gas tank, and crank case.
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Old 09-07-2011, 01:19 PM   #26
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I've read of higher end products such as GM top engine cleaner (which I don't think is sold anymore it they nerfed the formula). Maybe they used something a little more potent

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