Rough cold idle blues - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > Rough cold idle blues

Dana 30/ Dana 44 Chromoly shaft Kits- ECGSFS: 2007-2013 Jeep Wrangler "HALO" Angel Eye KitFlowmaster's Force II Axle-back exhaust system for the 201

Reply
Unread 03-23-2012, 11:06 AM   #1
bluedaffy
Registered User
1989 YJ Wrangler 
 
Join Date: Oct 2011
Location: Stevens Point, Wisconsin
Posts: 286
Rough cold idle blues

So when I first start my YJ for the day (4.2 w/ 32/36 weber), she jumps right up to 2000-2500 rpms and runs smooth for a few seconds and then starts to hiccup and become rough. Then when she is fully warmed the idle is nice n' low around 600-700 and smooth. No complaints about driveablilty or warm idle... just the cold start with the choke engaged. she's nuttered...

Anybody know what may be happening?

bluedaffy is offline   Reply With Quote
Unread 03-23-2012, 06:41 PM   #2
bluedaffy
Registered User
1989 YJ Wrangler 
 
Join Date: Oct 2011
Location: Stevens Point, Wisconsin
Posts: 286
Anybody? Is it rich or lean? Am I turning the key the wrong way? Starting it with my left hand instead of my right?
bluedaffy is offline   Reply With Quote
Unread 03-23-2012, 09:26 PM   #3
pete1991YJ
Registered User
1991 YJ Wrangler 
 
Join Date: Mar 2012
Location: Niagara Falls, NY
Posts: 1,623
I have a feeling the choke isn't letting off quickly enough. But I'm not a Weber expert. Some other guys here are, I'm trying to recall their names. Old4x could certainly help. Mcmud is the total expert. Take a look at this thread and ask them:
http://www.jeepforum.com/forum/f12/w...-issue-1308982
.
__________________
***--- Wrecking Crew member ---***
"I've prolly been around longer than you think"
pete1991YJ is offline   Reply With Quote
Unread 03-23-2012, 09:26 PM   #4
tslroper
Registered User
1990 YJ Wrangler 
 
Join Date: Aug 2010
Location: New Mexico
Posts: 380
Put a voltmeter on the wire running to the intake manifold heater. If the relay or fused burnt up it wont power on and it'll run rough until warmed up.
__________________
1990 YJ Islander, 4.2L MC2100 DUI HEI, 2.5" RE lift, 31x10.50 DuraTracs, HandenFab rear bumper / swing-out, Tough Terrain
off-road camp trailer.
Build thread: http://www.jeepforum.com/forum/f22/tys-yj-build-1502554/
tslroper is offline   Reply With Quote
Reply

Tags
cold start , hiccup , idle , mixture
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.