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Old 06-23-2010, 06:50 PM   #1
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Little/No/Buggy accel...have no clue

I've got a '99 sport with ~110k miles on it and it seems like it's beginning to show its age. It's acting up and I'm not sure what the problem is (though I have very limited experience so it might be something trivial).

When depressing the accelerator, the power given feels weak and will often not accelerate at all for a second or two. Ex: I press gas pedal and it takes it a second to go, then it gives it a little, then quits again, then gives it some more....it eventually gets on with the business but this is quite worrisome.
A friend suggested it could be anything from fuel injectors to the engine skipping. 4.0L 6-cyl by the way.

Any advice GREATLY appreciated!

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Old 06-23-2010, 07:19 PM   #2
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How long has it been since the spark plugs were changed?

Post this question in the TJ tech section and the guys there will help you out. Welcome and good luck

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Old 06-23-2010, 07:54 PM   #3
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To be honest I'm not sure. I bought it little over a yr ago, not since I've had it. It will sometimes skip when cranking before it finally gets going. That help confirm the spark plugs? If so that's great, I've changed plugs on vw's before...meaning the wrangler's plugs should be a cake walk.
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Old 06-23-2010, 08:39 PM   #4
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Engine aside, could possibly be a transmission issue too.

I always advise folks to start cheap and easy. Give it a tune-up, change the trans oil, put a little seafoam in the fuel tank, and clean the throttle body out.

Give it 100-200 miles and see how it goes, but more often than not, just doing the things I mentioned yields results pretty quickly.
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Old 06-23-2010, 08:40 PM   #5
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Yes, I would check the plugs. If you did them on a vw you should be able to on the jeep. Get a wobble socket extension, it helps with a couple of the harder to reach ones. Make sure to gap them at .035. Good luck
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Old 06-24-2010, 05:19 PM   #6
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well i got some time to work on it a bit and decided to start with the tran change. managed to bust my wratchet on the first bolt...so i'm out of it til tomorrow atleast. what luck.
update: on the way to AAP to get the foam/new plugs/million other things i noticed the lack of "go" getting worse. Even noticed a small clicking/knocking noise when i gave it more pedal when it cut out; hadn't heard this before...no clue what it might mean. Fearing transmission.
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Old 06-24-2010, 05:31 PM   #7
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It could be any # of things. See if you are getting any codes from the computer. Some auto parts stores will check it for codes. When the engine isn't running right the computer will store codes to help diagnose the problem. You should do all the things mentioned above first, it probably needs it anyway. Oil change, everything. Also is it a manual or auto tranny? My first guess from what you describe would'nt be transmission.
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Old 06-25-2010, 03:50 PM   #8
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Well i took it up to the mechanic @ the dealership and SOMEHOW i convinced him to drive it around with me and give me a diagnosis for free (i think hell froze over). He said "it feels like it's slack of fuel." So he thinks the fuel filter needs to be replaced which he then said was in the tank attatched to the fuel pump. Any thoughts? How difficult is it to replace yourself?
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Old 06-25-2010, 03:59 PM   #9
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You have to remove the tank and the fuel filter is supposed to last the life of the jeep. I doubt that's the problem. If you had it at the dealer he should have checked it for codes. Do the tune up.
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Old 06-25-2010, 04:12 PM   #10
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All right sounds good. This town's notorious for shady mechanics.
I'll keep posted on what kind of luck I have.
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Old 06-25-2010, 11:35 PM   #11
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For $2 or so get a new coil wire - sounds like it's going south.
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Old 06-28-2010, 08:41 AM   #12
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Well tune-up done w/ the exception of trans change (kept breaking ratchets tryin to get skid plate off) and it's definitely helped. Seemed to even solve the problem til today. Gas got down to about 1/4 tank and it started acting up again til i filled it up and it ran fine. Seems like an indicator of some kind of fuel problem?
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Old 06-28-2010, 01:20 PM   #13
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k scratch that, just did it again w/ the full tank. still no clue- taking it to find a code.
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Old 06-28-2010, 04:50 PM   #14
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No codes came up. Guy said he thinks the fuel pump is going bad or the filter is crappy. He also said you can't service the filter...how much bullshit is this guy throwin me?
This is REALLY random. Any chance there's just some shit in the fuel line somewhere/how to fix that if its possible?
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Old 06-28-2010, 04:52 PM   #15
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Quote:
Originally Posted by pokey View Post
How long has it been since the spark plugs were changed?

Post this question in the TJ tech section and the guys there will help you out. Welcome and good luck
X2 faulty plugs and wires will cause this. Start there. while your at it do the whole tunup.
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Old 07-02-2010, 10:37 PM   #16
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Ok update: finally got around to finishing the tune-up. Obviously better performance...except it seems to not have corrected the problem. Almost certain it's a fuel delivery problem and it feels to me like its getting choked up somewhere and not getting fuel. If I let off the gas for a bit then punch it, it'll get over it and go...something stuck in the line? If so how would I check/flush that properly?

Also: tried watching fuel pressure w/ a fuel pressure gauge @ the schrader valve...it wont act up for me when im monitoring this...tried for hours. *sigh*
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Old 07-07-2010, 09:31 AM   #17
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I had a similar problem with a '71 Pontiac...The in-tank fuel filter was nearly totally clogged..AND it happened at about that age and miles.
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Old 07-07-2010, 11:30 AM   #18
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It does sound like it could be a fuel delivery problem to me. My 97 TJ does the same thing every once in a while and I already know my fuel pressure regulator is going bad because it takes a long time to crank unless I cycle the ignition and prime the lines a few times. I plan to drop the tank and replace the whole fuel pump assembly one of these days. Unfortunately that's not a cheap part, so I'm with the other guys on trying all the cheap stuff first. I've already replaced my plugs, wires, distributor, rotor cap, oil+filter, air filter, ran seafoam, etc personally.

Another thing to try (as GroundHawg suggested) is clean the throttle body. I haven't gotten around to that myself but it could help the issue.
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Old 07-08-2010, 03:22 PM   #19
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Ok, done all of the above and nothing doing. I've heard you can replace the regulator separately from the pump assembly. However I'm not having any luck finding the regulator. Is it not under the hood? Last car I owned had it near the fuel rail and I could test it easily by just seeing if fuel was in the vacuum hose. Point me in the right direction?

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