Stumped, Please Help!! - JeepForum.com
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post #1 of 21 Old 05-26-2011, 11:46 AM Thread Starter
takethisride
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1996 ZJ 
 
Join Date: Jun 2009
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Stumped, Please Help!!

Ive got a 96 jeep grand cherokee 4x4 5.2 V8.. Im having this rediculous issue with my jeep and I cant seem to figure out the issue like i have been able to do in the past.

The jeep has been great for the past couple of years that ive owned it. Everythign ran fine and dandy until about 2 months ago. I was actually on my way to pick up my son from day care then all of a sudden my jeep just starts sputtering and jerking around almost to the point of stalling out but it didnt.. luckily i ended up limping it into an autozone where they were really no help.

the jeep was not throwing any codes at all. it would crank up everytime, and it would idle perfect. its just when i went to hit the gas... no power just sputtering and sputtering. i could hold the gas down and it wouldnt even move more than 2 ft.. anyhow, unable to resolve the issue i had it towed back to my house. a couple days go by of me testing things here and there, it all came down to being my Oxygen sensor..

now by replacing the sensor that fixed the majority of my issue. i could drive it around again and it was fine. the only issue i had left was when i gave it gas it still sputterd in the 500-1500rpm range then would be fine after that. if i let off the gas while driving and then hit the gas again it would hesitate then go.

well my mistake was putting in a bosche O2 sensor, which fouled, it was replaced and then that one fouled, now ive got a MOpar one in which is great.. BUt i still have this sputter issue... in park it idles perfect, in N it idles perfect, in Drive or reverse it idles perfect. its just when i hit the gas it sputters and hesitates from 500-1500rpm. now it only happens when i give it some gas, when i ease into it, it works like a charm. Ive replaced the IAC, The Map Sensor, the TPS, new cap, rotor, plugs, and wires, new Mopar O2sensor. Im getting like 38psi fuel pressure. i can hear the fuel pump turn on. replaced the fuel filter..

Any advice or help would be greatly appreciated.. Its not throwing any codes and its not stalling out at all..

As far as the Computer.. I dont know what the hell to do about that. I replaced it with another 96 and it would start up, same with a 97. its wierd, when i look at other 96 IAC connectors they look the same as 97 and up. my sensor connectors match that of a 94 and 95 but i dont have that EGR thing near the main harness..


96 ZJ 5.2L 4x4, 4.5" Lift, NP231 swap, Beefed Custom Cline front DS, 33" Goodyear Wrangler Duratracs, 15x10 RCX wheels, JKS front and Rear track-bars, Flowmaster 40series, Cobra CB radio, Optima Yellow Top, Snorkel, Rough Country winch mount, Super Winch TS9500, cut fenders, Red Jeep Club #572, Built Not Bought #279
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post #2 of 21 Old 05-26-2011, 11:55 AM
MONSooNmonkey
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1998 XJ Cherokee 
 
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Location: boggerville
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Possible clogged cat, pull your cat off and clean it with gasoline (clog one end with a potato or a willing hand, pour in a few cups of gasoline, slosh about and pour it out (should look nice n grimy), alternatively I've been told that you can run the car\truck hard to burn off the crud that's backing up the cat. I haven't tried that last method but the gasoline worked for me.


Sounds like either lack of fuel\air or plugged exhaust. Have you checked the plugs and injectors?

Sadface :(
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post #3 of 21 Old 05-26-2011, 02:48 PM
phbrown
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could this cause flames to come out your tail pipe for a little bit?

1994 Jeep Grand Cherokee Laredo| stock| 231 transfer case| 4.0L
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post #4 of 21 Old 05-26-2011, 02:55 PM
MONSooNmonkey
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Quote:
Originally Posted by phbrown View Post
could this cause flames to come out your tail pipe for a little bit?
rofl, doubtful, but make sure its dried out well otherwise you could look like this


Sadface :(
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post #5 of 21 Old 05-26-2011, 03:18 PM Thread Starter
takethisride
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1996 ZJ 
 
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Location: Upstate
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I forgot to mention, no cat. Haven't had one in a while. No flames at all though... ill pull the plugs again and check them out. I pulled them 3 weeks ago and they looked great. Not carbon build up or any signs of a fouled plug.. im gonna check the coil..

96 ZJ 5.2L 4x4, 4.5" Lift, NP231 swap, Beefed Custom Cline front DS, 33" Goodyear Wrangler Duratracs, 15x10 RCX wheels, JKS front and Rear track-bars, Flowmaster 40series, Cobra CB radio, Optima Yellow Top, Snorkel, Rough Country winch mount, Super Winch TS9500, cut fenders, Red Jeep Club #572, Built Not Bought #279
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post #6 of 21 Old 05-26-2011, 05:34 PM
ZeeJay1997
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I thought 96 had the module with all the filter/regulator in the tank

Do you have a pressure regulator on the fuel rail?


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post #7 of 21 Old 05-26-2011, 08:35 PM Thread Starter
takethisride
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Quote:
Originally Posted by ZeeJay1997 View Post
I thought 96 had the module with all the filter/regulator in the tank

Do you have a pressure regulator on the fuel rail?
well i know the fuel filter is outside of the tank. the regulator must be in the tank or on top of the fuel filter. i dont have one on the fuel rail itself.

i looked at the door on my jeep and it says manufacturing date 95, but the vin and title say 96... it seems like jeeps that were manufactured from 93-95 have the same sensor connectors, and jeeps 96-98 have the same sensor connectors.

mine on other hand has the harness from a 93-95 but it has no egr components like the 93-95. everything under the hood looks like its 96-98....

96 ZJ 5.2L 4x4, 4.5" Lift, NP231 swap, Beefed Custom Cline front DS, 33" Goodyear Wrangler Duratracs, 15x10 RCX wheels, JKS front and Rear track-bars, Flowmaster 40series, Cobra CB radio, Optima Yellow Top, Snorkel, Rough Country winch mount, Super Winch TS9500, cut fenders, Red Jeep Club #572, Built Not Bought #279
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post #8 of 21 Old 05-27-2011, 09:50 AM Thread Starter
takethisride
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ok so i went out and bought a new coild. replaced that. the jeep starts up a lot fast now.. no long cranking like it did before. even after its warmed up. spark plugs are good, theyre all firing properly.

NOTE: i went out and rented a fuel pressure guage to recheck my fuel pressure. im getting a steady 22PSI?.. i replaced my gas cap haha. didnt change anything. could this be my fuel pressure regulator going bad or my fuel pump?

96 ZJ 5.2L 4x4, 4.5" Lift, NP231 swap, Beefed Custom Cline front DS, 33" Goodyear Wrangler Duratracs, 15x10 RCX wheels, JKS front and Rear track-bars, Flowmaster 40series, Cobra CB radio, Optima Yellow Top, Snorkel, Rough Country winch mount, Super Winch TS9500, cut fenders, Red Jeep Club #572, Built Not Bought #279
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post #9 of 21 Old 05-27-2011, 10:41 AM
MONSooNmonkey
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Could be a clogged fuel filter.

Sadface :(
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post #10 of 21 Old 05-27-2011, 11:27 AM Thread Starter
takethisride
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Quote:
Originally Posted by MONSooNmonkey View Post
Could be a clogged fuel filter.
i jsut put a new filter on but ill double check it..

looks like ill be dropping the tank this weekend too.. lame... i have a half tank of gas

96 ZJ 5.2L 4x4, 4.5" Lift, NP231 swap, Beefed Custom Cline front DS, 33" Goodyear Wrangler Duratracs, 15x10 RCX wheels, JKS front and Rear track-bars, Flowmaster 40series, Cobra CB radio, Optima Yellow Top, Snorkel, Rough Country winch mount, Super Winch TS9500, cut fenders, Red Jeep Club #572, Built Not Bought #279
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post #11 of 21 Old 05-27-2011, 11:43 AM
yzjwk
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one thing you could try before dropping the tank is have someone on the gas holding it at a sputter then bang on the gas tank with your hand or rubber mallet . if the problem's in the pump then the vehicle should run differently (or stall ) unless you just got a plugged sock or something .
Another thing i would check is the butterfly valve on the throttle body .Make sure there's not too much play in the cable and that it's not sticking at all .
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post #12 of 21 Old 05-28-2011, 01:50 AM
shaggynilwal
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check your fuel press as you give it gas, to see if it drops considerably, possibly the backpress regulator on the fuel rail
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post #13 of 21 Old 05-28-2011, 11:05 AM Thread Starter
takethisride
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Quote:
Originally Posted by shaggynilwal View Post
check your fuel press as you give it gas, to see if it drops considerably, possibly the backpress regulator on the fuel rail
I tested the fuel pressure while revving. It holds 22psi regardless.. im gonna drop the tank today. Or attempt to. Im thinking possibly my fuel pressure regulator*******[/PHP]

96 ZJ 5.2L 4x4, 4.5" Lift, NP231 swap, Beefed Custom Cline front DS, 33" Goodyear Wrangler Duratracs, 15x10 RCX wheels, JKS front and Rear track-bars, Flowmaster 40series, Cobra CB radio, Optima Yellow Top, Snorkel, Rough Country winch mount, Super Winch TS9500, cut fenders, Red Jeep Club #572, Built Not Bought #279
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post #14 of 21 Old 05-28-2011, 03:32 PM
Doxastic
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Hmmm.... 22psi sounds low. What's it supposed to be? I just checked my 5.9L's fuel pressure and it was at 40psi before starting, then about 48psi when I turned the engine.

Look up what your psi is supposed to be but that sounds like an issue to me.
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post #15 of 21 Old 05-28-2011, 04:25 PM
bigzj
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sounds like you could have a sticking butterfly, I would disassemble and clean your "carburetor" loosely worded since it's fuel injected.
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