93 JGC Stuttered Bad When Leaving Parking Lot - JeepForum.com
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Unread 03-15-2013, 06:27 PM   #1
EndIsNear
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1993 ZJ 
 
Join Date: Mar 2013
Location: Amarillo, Texas
Posts: 279
93 JGC Stuttered Bad When Leaving Parking Lot

So today I was pulling out of the doctors office parking lot and got on the street, and my Jeep just stuttered and would not go. Shook a little. Took a good 3-400 yards of feathering the throttle for it to finally kick in and start going. Then it was fine. Stopped at the auto store to pickup some Seafoam and throttle body gasket. Started it back up with AC on and it idled very rough at low (maybe 400 RPM) and giving it throttle, it would smooth out. Let off and it would run rough again. Got on the road finally and drove a few blocks and it ran fine all the way home. Prior to this event I've cleaned IAC and throttle body. Jeep is new to me so I have no clue how old the fuel filter is. Plan on seafoaming tonight. When idling, giving it a good twist of throttle, it would rev up, back down, then act like it wanted to die, then idle normally again. Could this be the TPS causing all of this? This is a vague question just having a hard time diagnosing the issue on a Jeep I've had for three days. Thanks in advance!

1993 Jeep Grand Cherokee
4.0L I6 Automatic

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Unread 03-27-2013, 08:32 PM   #2
EndIsNear
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1993 ZJ 
 
Join Date: Mar 2013
Location: Amarillo, Texas
Posts: 279
Well I've done some research and have narrowed things down a bit. So far i've done tons of fuel system cleaner, Seafoamed through brake booster twice, changed fuel filter, have tried priming the fuel pump 2-3 times before trying to crank, and she still acts up. Still takes 8-10 cranks to fire up. Today when getting ready to leave work, I cranked it up, let it sit for a few seconds with the A/C on, and the RPMs dropped very low, idled very rough, and when I "popped" the throttle a little, it hesitated, revved, then returned to running rough. This all lasted a good 10-15 seconds. So I started leaning towards the whole fuel pump being bad. But I stumbled across a thread on here on testing the fuel pressure regulator. So just a few minutes ago, I cranked it up, let it idle for a bit, pulled the vacuum line, and she idled the same. Plugged it back in, and it stumbled. Only tried once as I'm waiting on my neighbor to get home to give me a second input on the stumbling. So could this possible be the issue? Is there any other ways to test this? And using a fuel pressure gauge wont determine if its the regulator or pump, right? Any ideas?
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Unread 03-27-2013, 09:03 PM   #3
EndIsNear
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1993 ZJ 
 
Join Date: Mar 2013
Location: Amarillo, Texas
Posts: 279
Well, I may have been wrong. I was pulling the vacuum line from the manifold, not directly off of the regulator. Pulling it from the regulator resulted in no change. I guess its time for the gauge. Its the only other thing I can thing of,,,
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Unread 03-28-2013, 12:48 AM   #4
jeepkid945
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1993 ZJ 
 
Join Date: Dec 2012
Location: Melbourne, Florida
Posts: 124
My map sensor vac line broke last night mudding and did almost the same thing. Thank god for duct tape. Did you pull any codes?
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Unread 03-28-2013, 07:27 AM   #5
EndIsNear
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1993 ZJ 
 
Join Date: Mar 2013
Location: Amarillo, Texas
Posts: 279
I did a few days ago with the key trick, and only got like 12 55 or something. When I looked it up it was saying something like 12 being that the battery was unhooked withing the last 50 starts and 55 being end of test. Other than that, no.
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