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Unread 06-02-2013, 02:00 AM   #1
diaz425
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1990 YJ Wrangler 
 
Join Date: Mar 2013
Location: NW Suburbs Chicago, Illinois
Posts: 35
Stalling problem after warm up

my jeep just started stalling after warm up. at first i thought i ran out of fuel. after a min i would start her and she would start fine than dies. i had to get it towed to my house. the next day on a cold start i started her up with no problems after about 10 mins warming up it stalls. than i started again than stalls 2 mins later. what is causing the problem. i returned the 6 months old fuel pump and got a new one just in case that was the problem (still under warranty. haven't install yet. rainy day).
btw i just bought new coil. not yet install (it's 2am)

any other ideas??

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Unread 06-02-2013, 08:09 AM   #2
Old4X
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1990 CJ7 
 
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Is it rich or lean running when it stalls?
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418 miles on 19 gallons of gas. Can't beat the BBD !
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Unread 06-02-2013, 08:17 AM   #3
EABiker
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1989 YJ Wrangler 
 
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Is it showing any codes? If it runs cold and not warmed up, that most likely means a sensor has gone bad. When cold, the ECU controls the engine by using a fixed set of curves, (open loop). When the engine reaches operating temperature, the ECU monitors the inputs from the sensors, and adjust the fuel and timing accordingly, (closed loop). If one of the sensors has gone bad...well you know the saying, "garbage in, garbage out".
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Unread 06-02-2013, 05:26 PM   #4
Que89YJ
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1989 YJ Wrangler 
 
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Disconnect your O2 sensor and see if it still does it. O2 or engine temp sensor.
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Unread 06-02-2013, 06:41 PM   #5
diaz425
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Forgot to mention. When it is about to stall it bogs like if i ran out of gas.
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Unread 06-02-2013, 08:41 PM   #6
Old4X
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What do your plugs look like?
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Unread 06-03-2013, 08:07 AM   #7
UZI4U
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Run it and let it get warm. If the head pipe before the cat converter is too hot to touch and the pipe behind it is relatively cool, your cat converter is plugged.
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Unread 06-03-2013, 05:12 PM   #8
diaz425
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1990 YJ Wrangler 
 
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Location: NW Suburbs Chicago, Illinois
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i put on new fuel pump and coil. i also tighten the o2 sensor (was loose). after doing those i started her up and notice the rpm needle acting up just before the car stalled.
i will try what UZI4U said about the cat. cant do it now gotta go to work
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Unread 06-03-2013, 05:24 PM   #9
diaz425
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Location: NW Suburbs Chicago, Illinois
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i started her up right now ran great than dies out (as if i shut her off).
I read somewhere in here about ICM. Where is the ICM located at?

here is the where i found out about the ICM http://www.jeepforum.com/forum/f12/h...le-bad-663378/
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Unread 06-03-2013, 07:44 PM   #10
Old4X
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The ICM is under the washer bottle
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Unread 06-03-2013, 07:47 PM   #11
flcracker
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Quote:
Originally Posted by Old4X View Post
The ICM is under the washer bottle
That is the ecm, I think the icm is in the distributor
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Unread 06-03-2013, 09:06 PM   #12
Old4X
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4.2 ICM is under the washer bottle like I said. Look it up on the maint manual
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Unread 06-03-2013, 09:17 PM   #13
flcracker
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Quote:
Originally Posted by Old4X View Post
4.2 ICM is under the washer bottle like I said. Look it up on the maint manual
Crap, sorry, spoke too soon... that is where the ecm is on mine.... note to self: don't open mouth before engaging brain...
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Unread 06-03-2013, 10:14 PM   #14
Que89YJ
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icm is the coil with the plug wire running to the distributor.
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Unread 06-03-2013, 10:14 PM   #15
Que89YJ
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1989 YJ Wrangler 
 
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ignition coil module
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