cold start up - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 12-01-2010, 07:16 AM   #1
Wench's Avatar
Join Date: May 2010
Location: Lincolnton, NC
Posts: 475
Send a message via AIM to Wench
cold start up

Ok heres the deal..i know there has been posts about this but I'm taking it 2 steps. I have 03 rubicon (4.0L) and on cold start up the engine turned 10-12 times before it finally fires up. The only way to prevent excessive turnover is to stick the key in and turn it to pre-ignition and wait 10-15 seconds for everything to prime. Even doing that sometimes doesnt stop the spitting.. My primary thought was the anti-drainback valve inside the fuel pump assembly. So i dropped 200 bones and the fuel tank...replaced the assembly and its still doing the same thing...the next thing i tried was new battery terminals because my old ones didnt make a good connection with the battery....was thinking maybe this is a "computer" issue. THAT still didnt work. So this was 32 degrees...nice and cold...I tapped the gas and it fired up on the second turnover. It was a little hesitant at first but the the rpm climbed up to normal.

Now I'm thinking this could be a sensor issue...crank or cam postition....anyone have any ideas/thoughts??

You can lock it..even put a different t/c in it..but its still not a RUBICON!
Wench is offline   Quote Quick Reply
Old 12-01-2010, 09:05 AM   #2
jasonwrangler's Avatar
Join Date: Oct 2010
Location: Omaha, NE
Posts: 892
could be a O2 sensor or IAC
jasonwrangler is offline   Quote Quick Reply

Quick Reply

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


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

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Slow to Start... jesterjon12 YJ Tech Forum 7 07-16-2010 07:47 AM
Cold start idle surge? motomc1 TJ Tech Forum 0 06-29-2010 08:01 PM
wont start cold?! Mikeyz89YJ YJ Tech Forum 2 02-14-2009 09:14 AM
new clue in cold start problem grogan14 YJ Tech Forum 4 11-18-2007 02:01 PM
Cold start valve?? coolman8bc TJ Tech Forum 2 05-15-2006 08:32 PM

» Featured Product

All times are GMT -5. The time now is 09:24 PM.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC