4 Banger runs poorly when cold; which is the ECM temp sensor? - 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 > 4 Banger runs poorly when cold; which is the ECM temp sensor?

Year End Clearance Sale! Save 20%NEW!! HMF 50"-52" light bar mounting brackets!! Introducing MONSTALINER™ UV Permanent DIY Roll On Bed Line

Reply
Unread 04-08-2010, 08:17 AM   #1
EABiker
Registered User
1989 YJ Wrangler 
 
Join Date: Dec 2004
Location: Frederick, MD
Posts: 1,682
4 Banger runs poorly when cold; which is the ECM temp sensor?

My Jeep has become cold blooded; rough choppy idle, stalls. low power...until it warms up and runs fine, classic symptoms of an open choke on a carbed engine. Since I have throttle body injection, I know its because the ECM thinks the engine is warm, and has the mixture wrong. I've seen on this forum that the proper sensor can be hard to find. NAPA shows a coolant temp sensor, ( @ $79! ) , so I certainly do not want to get the wrong one at that price. I can unplug the each of the two to determine which goes to the ECM, and which goes to the temp gauge, but is the ECM one hard to find at the parts store?

EABiker is offline   Reply With Quote Quick reply to this message
Unread 04-08-2010, 07:49 PM   #2
laybackman
Bikini Bridge Inspector
 
laybackman's Avatar
1995 YJ Wrangler 
 
Join Date: Dec 2002
Location: Massachusetts
Posts: 6,314
Quote:
Originally Posted by EABiker View Post
My Jeep has become cold blooded; rough choppy idle, stalls. low power...until it warms up and runs fine, classic symptoms of an open choke on a carbed engine. Since I have throttle body injection, I know its because the ECM thinks the engine is warm, and has the mixture wrong. I've seen on this forum that the proper sensor can be hard to find. NAPA shows a coolant temp sensor, ( @ $79! ) , so I certainly do not want to get the wrong one at that price. I can unplug the each of the two to determine which goes to the ECM, and which goes to the temp gauge, but is the ECM one hard to find at the parts store?
I beleive that the coolant temperature sensor (for the ECM) is screwed into the side of the intake manifold.
__________________
"Taking care of our veterans is a cost of war. If you can spend six trillion dollars sending people to war, you can spend a few billion dollars taking care of them when they come home"
Sen. Bernie Sanders (I-Vt.)

If what doesn't kill you, makes you stronger, I should be able to bench press a Grand Cherokee by now!
laybackman is offline   Reply With Quote Quick reply to this message
Unread 04-08-2010, 09:01 PM   #3
Mark05059
Registered User
1989 YJ Wrangler 
 
Join Date: Mar 2009
Location: quechee Vermont
Posts: 4,397
you need a 2 wired sensor if that helps.
http://www.autozone.com/autozone/cat...questid=106527
__________________
1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
/l , [____],
|---L--[]lllllll[]-
()_) ()_)==O=)_)
Mark05059 is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


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.