95 ZJ Shutters when Flooring Gas - JeepForum.com
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Unread 10-09-2013, 09:22 AM   #1
zwzj4life
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1995 ZJ 
 
Join Date: Nov 2011
Location: Zebulon, NC
Posts: 180
95 ZJ Shutters when Flooring Gas

I'm having a fairly new problem. When I floor the gas such as when merging with traffic or changing lanes the Jeep will get up to about 4k RPM and then starts "studdering". I'm not sure what else to call it. It wont accelerate any further and it feels like its skipping. It's very weird. If I accelerate without putting the gas all the way down maybe half to 3/4 of the way it's fine. It only does it when the gas pedal is fully engaged. What could possibly be the issue here. It's a 4.0 I6.

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1995 Jeep Grand Cherokee Laredo (ZJ) / 4.0L I6 / D30 front, D35 rear / 3 Inch Boost / 31X10.50R15 BFGoodrich M/T
Zombie Outbreak Response Unit #313
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Unread 10-09-2013, 09:29 AM   #2
newfieZJ
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1995 ZJ 
 
Join Date: May 2008
Location: , Alberta
Posts: 6,406
Test the TPS for starters .
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Unread 10-09-2013, 09:35 AM   #3
zwzj4life
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1995 ZJ 
 
Join Date: Nov 2011
Location: Zebulon, NC
Posts: 180
Before I bought the Jeep the TPS was bad and the PO supposedly replaced it. If this one is bad also what could cause them to keep failing? If this is the case....
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ZwZj4Life
1995 Jeep Grand Cherokee Laredo (ZJ) / 4.0L I6 / D30 front, D35 rear / 3 Inch Boost / 31X10.50R15 BFGoodrich M/T
Zombie Outbreak Response Unit #313
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Unread 10-09-2013, 09:51 AM   #4
PolkaPower
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1998 ZJ 
 
Join Date: Aug 2011
Location: The Abyss, MD
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Quote:
Originally Posted by zwzj4life View Post
Before I bought the Jeep the TPS was bad and the PO supposedly replaced it. If this one is bad also what could cause them to keep failing? If this is the case....
Cheap auto parts store sensors. They are very loosely calibrated to Mopars standards and often perform like crap right out of the box. Always use Mopar sensors.

If you have a Junkyard nearby you can go grab a dozen or so and test them out for spares. I always grab whatever sensors I can find at the yards. Some of those still have plenty of life left in them.

Or you can buy new and not worry about it.
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Unread 10-09-2013, 09:57 AM   #5
zjosh93
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1993 ZJ 
 
Join Date: Aug 2010
Location: Austin
Posts: 1,104
I'd also take a look at your ignition and catalytic converter.
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Unread 10-13-2013, 04:18 PM   #6
BeDifferent
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1995 ZJ 
 
Join Date: Nov 2012
Location: Powell, TN
Posts: 100
this happened to me with 95 grand v8, found it to be a bad cat, but also muffler was bad, replaced both and problem gone. still could be tps or gas filter. (or more or combinations)
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Unread 10-13-2013, 05:43 PM   #7
ZeeJay1997
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1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
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if the engine temp rises a bit when it starts missing, you can bet it's the cat.
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Unread 10-14-2013, 02:38 AM   #8
youwish0411
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1994 ZJ 
 
Join Date: Aug 2013
Location: Ada, Mn
Posts: 17
I had this same exact problem.Thought it was the fuel filter, but it didn't fix it. Eventually it got worse to the point where it wouldn't start anymore... Sounds stupid simple but check the coil wire. That was the problem with mine... bad wire. Put a new wire on it and now it is back to running like a top. Just a suggestion. Good luck!
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Unread 10-14-2013, 06:19 AM   #9
newfieZJ
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1995 ZJ 
 
Join Date: May 2008
Location: , Alberta
Posts: 6,406
Coil wire is a great lead . When was the last tune up ? This could be a bad plug even , might work , just not well .

Give us the low down on what you know as been done to this jeep .

BTW , a simple test for the ignition would be , hose it down and then try to start it . Any hiccups , and you found your problem . Good ignitions can handle a good engine bay cleaning without issue , I pressure wash mine all the time . Double check all the wires for good contact at the plug and distributor cap . Spark jump could very well be your issue . Simple fits
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