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Old 11-18-2008, 02:11 PM   #1
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acceleration issues...

Hi, I just bought a 98 tj, 4 cyl, 5 speed last week, and have been working on it trying to get it in tip-top shape... a couple of questions, regarding both mods and the way it is running...

first: there is a hiccup in the acceleration when i am in both second in third gears, anywhere between 2200 and 3000 rpms... does anybody know what may cause that, and how i may fix it so it accelerates smoother.

second: i want to make the jeep more equipped for some trail riding... its got aftermarket 31's on it, but no suspension. I have read some about the difference between body and suspension lifts. Since i am in college and don't have oodles of money to work with, the body lift is the more viable alternative; however, it does not appear from what i have read to be as beneficial. Could i perform a body lift myself? And what would the pros and cons be?

thanks y'all,

paul

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Old 11-18-2008, 02:22 PM   #2
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Describe the hiccup?

Body lift will make your jeep taller and allow larger tires that's about it. Golden rule to not look like a total scrub is to not go over one inch of body lift because it does nothing and tends to stick out like a sore thumb if you go any higher (mostly opinion of course). After the one inch Body Lift your going to want to put the rest into suspension and there is the expensive complete lift route and the expensive but affordable Budget Boost route. Your pick after that..

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Old 11-18-2008, 02:35 PM   #3
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the hiccup:

if i have the gas pedal pushed in anywhere between lightly and medium hard (it tends not to do it if I am really mashing it), then the jeep basically shudders and there is a slight break in acceleration, before picking up again.

and as far as the lifts go... a 1 inch body lift would be completely acceptable? i don't want to look like i'm trying to hard and then make it look stupid.

would i most certainly want to follow up with a complete lift or budget boost, or would it be okay on its own?
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Old 11-18-2008, 02:44 PM   #4
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If you just want a lil extra lift for looks then the 1inch BL will do fine. If you plan to do a lot of wheeling you may want to go with a BB or full lift sooner or later.
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Old 11-18-2008, 03:30 PM   #5
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I would guess the hicup in acceleration would be a spark plug issue. I would start there. Worst that happens is you spend $15 and an hour to change the plugs. If it doesn't fix it, hey they probably needed it anyway.
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Old 11-18-2008, 03:53 PM   #6
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hey, thanks for the tip...

yes, they did need it anyways, but i did it over the weekend, and the hiccup is still there...

thanks anyhow
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Old 11-18-2008, 04:06 PM   #7
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just put a two inch lift in it.. dont even mess with the hockey pucks.. the new suspension will make the difference in your jeep
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Old 11-18-2008, 06:20 PM   #8
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Well if you already changed the plugs, maybe the fuel filter? I could see it causing hesitation issues at part throttle, then when you go full throttle the fuel pressure rises and overcomes whatever is starting to clog the filter. Just tryin to throw things out there.
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Old 11-19-2008, 06:03 PM   #9
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That "hiccup" COULD be caused by the TPS.

You just bought it - does the engine compartment look like it's been steam or pressure washed clean?

If so, water or moisture may have gotten inside the TPS since it's not really sealed.

The moisture moves the dust around inside it, causing it to lose contact momentarily, causing a "hiccup."

Try taking if off and cleaning it with a good contact cleaner - NOT WD-40!
If it's worn or won't clean up they aren't expensive anyway.

Electrical test while in place and connected - use an analog meter - the old style meter with a real meter, not a digital.
Use a straight pin to back probe the TPS connector - 3 wires, one is ground, one is 5 volts, and one is the wiper - probably the middle wire - probe that one.

Key On, Engine Off - SLOWLY open the throttle while watching the meter. The meter should move SMOOTHLY and evenly from near 0 to near 5 volts - no bumps, hitches or glitches. If it has glitches clean or replace it.

Also check your coil wire if it doesn't have the coil rail.
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Old 11-19-2008, 08:06 PM   #10
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Quote:
Originally Posted by rrich View Post
That "hiccup" COULD be caused by the TPS.

You just bought it - does the engine compartment look like it's been steam or pressure washed clean?

If so, water or moisture may have gotten inside the TPS since it's not really sealed.

The moisture moves the dust around inside it, causing it to lose contact momentarily, causing a "hiccup."

Try taking if off and cleaning it with a good contact cleaner - NOT WD-40!
If it's worn or won't clean up they aren't expensive anyway.

Electrical test while in place and connected - use an analog meter - the old style meter with a real meter, not a digital.
Use a straight pin to back probe the TPS connector - 3 wires, one is ground, one is 5 volts, and one is the wiper - probably the middle wire - probe that one.

Key On, Engine Off - SLOWLY open the throttle while watching the meter. The meter should move SMOOTHLY and evenly from near 0 to near 5 volts - no bumps, hitches or glitches. If it has glitches clean or replace it.

Also check your coil wire if it doesn't have the coil rail.
thanks for the advice...

yeah, i got a prepurchase inspection from a local garage, and they said i may need to replace the TPS (throttle position sensor, i'm assuming?). they said it may also be the reason for the check engine light. Is a cheap TPS as reliable as a more expensive one? money IS not feelin too good right now... thanks again
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Old 11-20-2008, 01:56 AM   #11
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Is a cheap steak as good as a more expensive one?

I wouldn't trust one unless it's from the dealer. As I remember, they are less than $50.

Check it with the voltmeter first.

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