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Old 03-21-2012, 04:20 PM   #1
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92 wrangler need some tech help

i recently bought another jeep a 92 wrangler it had low oil pressure so changed the pump then got to looking and turned out had to change main bearings, rod bearings, water pump timing chain, rockers, plugs, wires, cap and rotor, feul filter.. so i started it up and and it idles fine timing is perfect but it will drop idle and come back and be fine but when i hold the accelerator steady any where between 11 and 1800 rpm it stumbles and hesitates anywhere above that its fine even does it while it is driven any ideas?

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Old 03-21-2012, 04:43 PM   #2
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i checked for vaccum leaks, tested map sensor and o2 sensor, and air idle control, and changed out crank sensor no change im lost dont know where to go from here

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Old 03-25-2012, 12:30 PM   #3
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I am having the same problem. I hope someone can help! My problem is driving me nuts!
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Old 03-26-2012, 12:39 AM   #4
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May need a good throttle body and injector cleaning.
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Old 03-26-2012, 01:17 AM   #5
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what carb do you have on it?.. also check into the nutter bypass
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Old 03-26-2012, 05:55 AM   #6
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Quote:
Originally Posted by Bluegrass
what carb do you have on it?.. also check into the nutter bypass
It's a 92. They're fuel injected
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Old 03-26-2012, 06:03 AM   #7
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Quote:
Originally Posted by marine92wrangler
i recently bought another jeep a 92 wrangler it had low oil pressure so changed the pump then got to looking and turned out had to change main bearings, rod bearings, water pump timing chain, rockers, plugs, wires, cap and rotor, feul filter.. so i started it up and and it idles fine timing is perfect but it will drop idle and come back and be fine but when i hold the accelerator steady any where between 11 and 1800 rpm it stumbles and hesitates anywhere above that its fine even does it while it is driven any ideas?
I'm guessing your throttle position sensor is shot.. you can test them with a multimeter.. The TPS is on the back of the throttle body (closest the firewall) and is a 3 wire.

I can't remember the EXACT procedure but basically if you have auto ranging meter throw it on ohms, unplug the pigtail.. put one lead on the center of the sensor itself and one on the left and slowly open the throttle.. It should either go from 0 to 5 or 5 to 0 watch and make sure it doesn't jump or go out of limits (OL) on the display. It should gradually climb or fall.. Repeat the process but use the center and Right side this time.. It will do the opposite when you open the throttle.. If it doesn't gradually go from 0 to 5 or 5 to 0 it's bad.. Sorry i'm on my phone else I'd post a link to a how to
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Old 03-26-2012, 10:52 AM   #8
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thanx for all the input i really appreciate it its been driving me nuts could the tps cause that much damage i tried reading the codes and all i got was the battery had been disconected and end of code, would that matter?
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Old 03-26-2012, 11:08 AM   #9
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it may be possible that your timing is off. either in the chain, or the distributor.
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Old 03-26-2012, 11:20 AM   #10
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Have a 92 4cyl and was hesitating as well. Id b drivin down the road n it looked n felt like I was learning to drive stick n the jeep was about to stall. Never really stalled but it was scary driving down the freeway at 65mph then all of a sudden the jeep would "hiccup", I was afraid of getting rear ended cause it would slow down quick n then after a few seconds it would like come back to life again. Three mechanics couldn't even read the codes!! I did a search and found out how to read them myself.
Several folks helped me n suggested n my thread that it could b the TPS. I went and bought one ($35) and replaced it myself in like less than 5mins.

It's been driving great ever since!
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Old 03-26-2012, 01:03 PM   #11
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i had that happen to me in my 4.0 a few weeks back with the GF. I figured out (after some looking into it on the side of the road) my gas gauge was a little off and that i was running out of fuel. Filled her up and i was good to go. Repaired the fuel sensor no more issues.
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Old 03-26-2012, 06:35 PM   #12
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just changed the tps no change
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Old 03-28-2012, 04:12 PM   #13
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Have you checked, or changed your distributor ?
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Old 03-28-2012, 04:15 PM   #14
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never mind just re read your first post.... I think i just got water i think so they told me to load it up with WD-40 *Water Displacement-40* and it should help. and next time i go into deep water do some before and it would prevent it
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Old 03-29-2012, 08:30 AM   #15
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CLEAN the IAC. (idle air control valve) that part that looks like a penis having sex with the throttle..lol!

and while you are in there clean out the throttle body. then recheck your timing and or adjust the distributor accordingly.

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