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Unread 03-13-2010, 05:18 PM   #1
theredjeeper
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1995 ZJ 
 
Join Date: Oct 2009
Location: Ayden, NC
Posts: 8
my jeep is idling low and shakes

When im sitting in park, reverse, or drive sitting still my zj idles low and shakes alot, i have to hold the gas and brake at stop lights to stop shaking. Ive been told it might be the motor mounts( they were good) and also the Throttle body sensor. any ideas?

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Unread 03-13-2010, 05:25 PM   #2
ZeeJay1997
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1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,737
I would clean throttle body and Idle air control. Do some searches on the forum, common 1st attempt to troubleshoot the problem and it's almost free.
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Unread 03-13-2010, 05:28 PM   #3
theredjeeper
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1995 ZJ 
 
Join Date: Oct 2009
Location: Ayden, NC
Posts: 8
ive cleaned my throttle body a few times and havent changed anything, ill try the IAC and see what happens. do u think it could be the throttle body sensor?
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Unread 03-13-2010, 05:37 PM   #4
ZeeJay1997
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I believe you mean the throttle position sensor. Yes, it could be, but i would clean the IAC good first.

You can electrically test the TPS:

The TPS (Fig. 59) can be tested with a digital voltmeter.
The center electrical terminal of the TPS is
the output terminal.
With the ignition key in the ON position, check the
TPS output voltage at the center terminal wire of the
connector. Check this at idle (throttle plate closed)
and at wide open throttle (WOT). At idle, TPS output
voltage should be greater than .350 millivolts but
less than 900 millivolts. At wide open throttle, TPS
output voltage must be less than 4.5 volts. The output
voltage should increase gradually as the throttle
plate is slowly opened from idle to WOT.
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Unread 03-13-2010, 05:42 PM   #5
theredjeeper
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1995 ZJ 
 
Join Date: Oct 2009
Location: Ayden, NC
Posts: 8
alright ill try that tomorrow. my uncle is a mechanic. you said something figure 59, where is that diagram or where should i look?
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Unread 03-13-2010, 05:53 PM   #6
ZeeJay1997
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Location: Sweet Home, Alabama
Posts: 6,737
Quote:
Originally Posted by theredjeeper View Post
alright ill try that tomorrow. my uncle is a mechanic. you said something figure 59, where is that diagram or where should i look?
I copied and pasted from the FSM, forgot to take the figure reference out. It's just a pic of the TPS.
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Unread 03-13-2010, 05:58 PM   #7
theredjeeper
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1995 ZJ 
 
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Location: Ayden, NC
Posts: 8
ok thanks for the help, im going to check that stuff tomorrow and i hope it works
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Unread 03-15-2010, 08:36 PM   #8
purplecty
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2003 WJ 
 
Join Date: Jan 2010
Location: Chicago, IL
Posts: 385
any luck??? because i have the same problem...
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Unread 03-15-2010, 08:47 PM   #9
ZJ97EB
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1997 ZJ 
 
Join Date: Sep 2009
Location: Brunswick, ME
Posts: 77
Mine was doing that last year and they replaced the distributer cap and it was all fixed
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Unread 03-17-2010, 07:28 PM   #10
purplecty
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Location: Chicago, IL
Posts: 385
did they only replace cap or rotor as well???
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Unread 03-18-2010, 02:08 AM   #11
befumo
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1989 YJ Wrangler 
 
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Location: , Delaware
Posts: 820
Should just do a complete tune up in general.
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Unread 03-18-2010, 05:15 AM   #12
purplecty
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2003 WJ 
 
Join Date: Jan 2010
Location: Chicago, IL
Posts: 385
PO did about 1-2 yrs ago but maybe used cheap parts... i only replaced spark plugs cuz i noticed autolites and i replaced wit champion. i also did 02 sensors... maybe i should just get new wires cap and rotor and coil as well huh? what about the distributor pick up? how do u know if that is going bad? any symptoms im having as a result of it going bad?
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