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Unread 02-01-2013, 02:39 AM   #1
97ZJCM
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1997 ZJ 
 
Join Date: Jan 2013
Location: Vallejo, CA
Posts: 5
low rpms, stalling, dying

So my 97 zj 5.2, it starts up fine and drives fine, but whenever you come to a slow/stop, the rpms drop to about 200, car acts like its going to die but then catches it self and goes back to idleing normal. On other occasions when you come to a stop or slow down it will die. The fuel pump does engage, i can hear it. So i dont think its a fuel problem. I could be wrong. No check engine light is on.

Just a list of things that have been replaced:
Spark Plugs
Battery
O2 sensors
Waterpump
Thermostat
Battery Terminals
Cat
Belt
IAC


Last edited by 97ZJCM; 02-01-2013 at 02:55 AM..
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Unread 02-01-2013, 03:15 AM   #2
Scopez
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1994 ZJ 
 
Join Date: Oct 2011
Location: Aiken, SC
Posts: 1,739
Shot in the dark, but I'd imagine this is either signs of a bad TPS or CPS. Vets will chime in soon.
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94 ZJ Laredo. 5.2 Crate engine. 6in JKS SA Lift. 33in Destination MTs. ARB Front Bumper.
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Unread 02-01-2013, 08:26 AM   #3
massarosareloud
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1996 ZJ 
 
Join Date: Dec 2012
Posts: 218
I know you can clean the idle air controller, sometimes they get a carbon buildup on them. Pretty simple, just take it out of the throttle body, hit it with carb cleaner, wipe it clean, and reinstall it. If you disconnect the battery during the repair the PCM will relearn the idle strategy.
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1996 Jeep Grand Cherokee Limited Edition 4.0L
3.55 axles, stock pretty much everything, except for a PSC steering gear and fuel injectors
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Unread 02-01-2013, 08:31 AM   #4
kachink
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1998 ZJ 
 
Join Date: Sep 2010
Location: Lake Forest, CA
Posts: 512
I suggest removing the throttle body and cleaning the carbon buildup under the IAC.
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Unread 02-01-2013, 08:43 AM   #5
Rich93ZJ
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1993 ZJ 
 
Join Date: Sep 2012
Location: Richland, Ga
Posts: 455
I see that you have already replaced the IAC, was it a MOPAR unit? If not, go and return it and buy the real deal. The 2 biggest culprits for this condition are IAC and TPS. To test the TPS....... Backprobe from center pin with positive and put neg to ground. Turn ignition to run (dont start). Voltage at idle position must read greater than 300mv and gradually increase to around 4.1 - 4.8 at WOT. If the voltage is inconsistent anytime during the test, your TPS is bad. It must start above 300mv and gradually go to 4.1 -4.8 when you move the throttle by hand. Test and report back. Also, any time you replace a sensor make sure you disconnect the battery.
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Unread 02-01-2013, 12:53 PM   #6
97ZJCM
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Join Date: Jan 2013
Location: Vallejo, CA
Posts: 5
Thanks for the info/help, much appreciated. I shall return with an update.
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Unread 02-02-2013, 01:16 AM   #7
97ZJCM
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1997 ZJ 
 
Join Date: Jan 2013
Location: Vallejo, CA
Posts: 5
Update: turns out it was the TPS. Im so excited the problem is fixed. Car now runs fine, idles normal, no more stalling, dying. Thank you for all the help info and tips
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Unread 02-02-2013, 05:06 AM   #8
Scopez
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1994 ZJ 
 
Join Date: Oct 2011
Location: Aiken, SC
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Quote:
Originally Posted by 97ZJCM View Post
Update: turns out it was the TPS. Im so excited the problem is fixed. Car now runs fine, idles normal, no more stalling, dying. Thank you for all the help info and tips
Congrats man! I had a strong feeling thats what it was.
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94 ZJ Laredo. 5.2 Crate engine. 6in JKS SA Lift. 33in Destination MTs. ARB Front Bumper.
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Unread 02-02-2013, 05:52 AM   #9
Rich93ZJ
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1993 ZJ 
 
Join Date: Sep 2012
Location: Richland, Ga
Posts: 455
Quote:
Originally Posted by 97ZJCM View Post
Update: turns out it was the TPS. Im so excited the problem is fixed. Car now runs fine, idles normal, no more stalling, dying. Thank you for all the help info and tips
Glad we could help.....
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