RPMs bottom out on decel - JeepForum.com
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Unread 04-27-2013, 03:14 PM   #1
thebean04
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1993 ZJ 
 
Join Date: Apr 2013
Location: Millbrook, AL
Posts: 13
RPMs bottom out on decel

Hello all. First time poster here. So I apologize if this is an old, worn out question. Couldn't find much on a search though.

So here it is: I've noticed that when coming to a stop, my '93 ZJ 4.0 will drop down to like 200-300 rpm, causing a stall out or near stall. Seems idle fine in park, only does this when coming to a stop.

Not much of a mechanic here, but really hoping to get into doing my own auto repairs/maintenance. Ay suggestions on what might be going on or a good place to start looking?

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Unread 04-28-2013, 06:17 AM   #2
youlost2melol
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1995 ZJ 
 
Join Date: Jul 2012
Location: Baltimore, MD
Posts: 25
I had the same problem try cleaning your IAC valve. I had a 5.2 mine was behind my throttle body. yours should be either there or on the side of it
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Unread 04-28-2013, 12:19 PM   #3
JeepNicholson
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1996 ZJ 
 
Join Date: Apr 2013
Location: Burbank, OH
Posts: 755
Quote:
Originally Posted by youlost2melol View Post
I had the same problem try cleaning your IAC valve. I had a 5.2 mine was behind my throttle body. yours should be either there or on the side of it
x2

I just did this a few days ago after stalling coming up my driveway and idle so low my engine wouldn't stay running without me gassing it. Cleaning took about 5 or 10 minutes with some carb n throttle body cleaner, believe the screws came out with a Torx bit but the size I can't remember, mighta been a T20. I cleaned the throttle body while I was there and also cleaned out the little channel that leads into your throttle body from the IAC.

After an initial rough start and a bit of white smoke which I suspect was from the carb cleaner, my Jeep now idles smooth and doesn't struggle to stay awake.
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Unread 04-28-2013, 04:17 PM   #4
thebean04
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1993 ZJ 
 
Join Date: Apr 2013
Location: Millbrook, AL
Posts: 13
Thanks for the info, guys! Picked up some carb cleaner and would love to get this fixed today, but it is pouring rain in AL today and I am working out of an uncovered driveway. Will give this a shot tomorrow. High hopes for a good outcome!
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Unread 04-29-2013, 09:39 AM   #5
thebean04
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1993 ZJ 
 
Join Date: Apr 2013
Location: Millbrook, AL
Posts: 13
Was able to get around to it last night. Was only able to clean the IAC valve, though, haven't cleaned any other thottle components yet. Seems to have make a big difference, though. Super steady on decel this morning. That thing was GUNKED UP! Thanks again for the help!!
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Unread 04-29-2013, 04:43 PM   #6
JeepNicholson
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1996 ZJ 
 
Join Date: Apr 2013
Location: Burbank, OH
Posts: 755
Nice! Gotta love those easy fixes!
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