Question about 1993 Jeep Grand Cherokee

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Bucking problems with a 94 Jeep Cherokee

My sister has a 94 Jeep Cherokee and it' bucking and surging bad. I originally thought she might have a bad plug, but I changed all of them and it's still doing the same thing. It acts like it's a fuel problem, so I thought it might be the fuel filter or fuel pump. Anyone have an idea what it might be before I start spending money by troubleshooting it.

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  • Chris Vann Jan 21, 2009

    Great. We'll give it a try. Thanks!!!

  • sscubas2000 Feb 28, 2009

    Have the same "Bucking" issue on wife's 1994 GC laredo.Also thought it may be fuel system or electrical because I had tranny rebuild 15 month's ago by reputable shop.(no electrical parts replaced in tranny).and it shifts great,no whine.not wanting to put much more money into it,hope you can help.

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If you have not put a fuel filter on yet i would, and then do a fuel pressure test. if filter don't help and pressure is wright, might be water in fuel. do fuel filter, pressure test, fuel additive, might be cheap fix. if what i said don't work, and everything else checks out ok, then the only thing left is fuel regulator. but also don't loose sight of it being electrical too.

Posted on Jan 21, 2009

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1 Answer

How do I stop my Jeep Cherokee from Bucking down the road?


first off what is bucking? you never said, (engine or trans)????
there are may parts on the car, that can buck, shake, or surge.


the jeep keyon off on trick usually is totally useless for this problem. but heck free to try.
the problem here is the ecu forgets some error after keyoff. oops.. you need to scan it using a real scan tool....

if savvy and like danger
try to see if the asd drops, at the buck moment.
there are ways to do that. ask.
(bad dealer, fire him) try an honest , ASE shop and mechanic.
google "ase shops" BINGO !

avoid stealerships and only as a last resort. (a ride to h3ll?)
for that cash could buy a running used one. here.
it's an old jeep, and like all old cars they will be a problem.
all old cars are.
I'd have a scan tool connected, my INNOVA 3140 (does old jeeps)(this tool does old jeep OBD1 scans)

and see what codes are stored, DURING the buck.
that's right driving and scanning, wife drives, you scan... or?
if it's the engine, it will show something,.
ill guess, now,.... (useless)
1: engine bucks, actually its stalls and recovers.
the jeep has a THING, called ASD.
if the ASD drops driving it WILL BUCK, and is clearly not transmission slip, or trans gear shifts caused.
its engine, so focus on the ENGINE and EFI system
if you lose to fuel pump pressure its not a buck its a slow bog.
so its not the pump dropping off line.
its spark dropping. and the ASD does that on purpose.

read this.

http://www.fixkick.com/Jeeps/ASD.html



what is something

if the ECU loses power, 12vdc main power,
the ECU goes off line and the scan tool shows. (lost comm)
bingo, no?
or if not that the ECU reports ASD related EVENTS (DTC'S)

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