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Unread 11-26-2010, 12:00 PM   #1
96jeepman
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1996 ZJ 
 
Join Date: May 2007
Location: tulsa
Posts: 189
Car Dying at Idle?

Hey guys,
Have a 96 ZJ Inline 6. I have had a slow battery drain. But recently had both my battery and alternator tested as good. Any Ideas as to why the zj would not be able to hold idle causing it to die? Its fine under power but as soon as I take the foot of the gas the rpm's drop and engine dies. Thanks

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Unread 11-26-2010, 12:07 PM   #2
bigvjp
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2001 TJ Wrangler 
 
Join Date: Mar 2010
Location: newport, nc
Posts: 4
zj help

it has to be the battery ,it will run with higher rpms off alt. but at idle battery needs proper volts ot stay running tps wont read signal. hope this helps.
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Unread 11-26-2010, 12:32 PM   #3
96jeepman
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1996 ZJ 
 
Join Date: May 2007
Location: tulsa
Posts: 189
battery is new could it be a bad ground to the battery?
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Unread 11-26-2010, 02:26 PM   #4
KevLaredo
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1997 XJ Cherokee 
 
Join Date: Dec 2009
Location: Rocky Hill, Tennessee
Posts: 386
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Unread 11-26-2010, 04:42 PM   #5
bigbossd1030
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1995 YJ Wrangler 
 
Join Date: Feb 2010
Location: Edmonton, AB, Alberta
Posts: 2,515
Try a new battery, these jeeps will not run properly without a good battery.
Just do this test, pull a good battery from a diff vehicle and put it in the jeep, if it still does it, then its not the battery, if it runs fine, then you know it was the battery.
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Unread 11-26-2010, 07:01 PM   #6
CharlesW16
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1998 ZJ 
 
Join Date: Aug 2010
Location: Pensacola, FL
Posts: 33
Most likely the battery, though it could be the alternator, if it isn't supplying sufficient voltage/amperage to the battery at idle. If my battery is a little weak (forgot to turn the lights off or something) it idles really slow until it gets charged back up.
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Unread 11-26-2010, 07:09 PM   #7
highlyuncntered
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1998 ZJ 
 
Join Date: Aug 2008
Location: Lafayette, IN
Posts: 259
Replace the IAC motor. I had a '99 Wrangler 4.0l that did the same thing. Ran just great until i took my foot off the gas, then nothing. Advance should have it for about $45.
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Unread 11-27-2010, 08:04 AM   #8
straight-pipe
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2007 JK Wrangler 
 
Join Date: Nov 2010
Location: Altona, Manitoba
Posts: 113
It could be a simple thing as a very dirty throttle body. My 5.2 wouldn't idle last year so I manually bumped up my idle and my fuel mileage wasn't very good either. I found out that my throttle body was caked with crap around the butterflies. I cleaned it up using a sensor safe intake cleaner and a soft brush. started the engine and sprayed the cleaner in the intake while feathering the throttle so that it wouldn't stall....the idle jumped up to 1700! I backed the idle screw back down to factory and everything is normal once more and got my fuel mileage back as well!
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