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Old 01-28-2009, 08:19 PM
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92 wrangler hesitation

Hello, I have a 92 wrangler 4.0l 5spd hardtop that is giving me a problem. It has a hesitation in it that happens at about the same throttle position (actual pedal position) which is right around the cruise rpm that I would normally ride. It seems that the engine completely dies for an instant and then jerks back to life whenever I am pressing the pedal to that point or releasing the pedal from just beyond that point.
I have replaced the Crank sensor, new plugs, new wires, new dist cap. I have unplugged the TPS and the Air temp sensor and I still have the same problem. What could be causing this problem? Oh I have no codes in the computer. The light will come on above 2000rpm but then goes off and doesn't leave a code.
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Old 01-28-2009, 09:16 PM   #2
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Question Is fuel the problem?

It looks like you've got 2 sides of the fire triangle covered, air and heat. Maybe its fuel delivery. I'm sure someone with more knowledge then I can enlighten us both.

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Old 01-28-2009, 10:19 PM   #3
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Check your fuel pump. do a fuel presure test. that would help

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Old 01-28-2009, 10:23 PM   #4
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yep, check fuel pressure, how's the fuel filter, and i'm thinking you replaced the rotor w/ the tune up but just forgot to say so.
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Old 01-29-2009, 02:48 AM
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Thanks for the input. How much pressure should it have? I also read a post about Manifold pressure sensor. Could this give this symptom?
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Old 01-29-2009, 09:15 AM   #6
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fuel filter, then fuel pump

You can't be far from fixing this with the amount of data you have already collected. Good luck!
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Old 01-30-2009, 11:57 PM   #7
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Um..."unplugged" the TPS? NO!!! That's what tells the computer where the throttle pedal is - think "volume knob". It needs to be hooked up.

I run into this on my turbo dodges sometimes - the TPS (again, think volume knob) can get a 'flat spot' in its rotation. Especially in a spot where you spend a lot of time - like cruising position. If you have a multimeter with a needle readout (not digital), do this:

Set the meter for ohms (resistance). Pull the TPS connector off and hook the meter to the 2 signal prongs (you can find that by moving the throttle and seeing if the needle moves). Once you're hooked, *gently* sweep the throttle from 0% to 100% and see if the needle moves smoothly on your meter. If it hitches, jumps, drops, or wiggles - you've got a dead spot. It should move as smoothly as you're moving the throttle blade.
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Old 02-02-2009, 01:39 PM
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I understand the theory behind checking for dead spot along the range but shouldn't the problem go away if the TPS is unplugged or does the computer remember the range across the TPS? If so, does the computer reset with power loss (disconnect the battery).

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