Help TJ Won't start - Jeep Wrangler Forum
Jeep Wrangler Forum

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

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 08-27-2012, 03:22 PM   #1
Jeeper
 
Join Date: Jan 2011
Location: Southern CA
Posts: 73
Images: 2
Help TJ Won't start

Last Tuesday, I went out to fire up My 01 TJ with a 4.0, and Automatic, and go to work. She'd crank but not fire. I'm thinking no fuel, or no spark.
I checked her out this weekend, and I have fuel to the fuel rail. Started reading my Chiltons on possible causes. I pulled the coil rail, and ohmed it out, Open winding. I bought a new coil rail, and new plugs. Installed all, and she still won't fire up. Now I get an error code of P0302, Misfire cylinder number 2, (she wasn't giving a code before). That should not stop her from firing up though. The next in line is a cam position sensor.

Anybody with vast knowledge have any ideas.

TJ922 is offline   Quote Quick Reply
Old 08-27-2012, 03:56 PM   #2
Moderator

WF Supporting Member
::WF Moderator::
 
doclouie's Avatar
 
Join Date: Feb 2010
Location: In the mountains.
Posts: 3,606
Images: 4
I would check the fuel pressure. Just having pressure does not mean it has enough pressure for the injectors. A fuel pump failure is much more common than the things you are looking into.

__________________
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up

doclouie is offline   Quote Quick Reply
Old 08-27-2012, 06:35 PM   #3
Jeeper
 
Leeroy Jeepkins's Avatar
 
Join Date: Nov 2010
Location: Bucks County,PA
Posts: 480
doesn't a misfire mean he has improper combustion in that cylinder? it's possible that OP may have over tightened and cracked the porcelain for that sparkplug causing it to ground out before combustion resulting in a misfire or maybe the plug was cracked from manufacturer. you may have created the code but the original problem still exists. find out which one is #2 and put an old plug in it. might be crankshaft position sensor as the original problem
Leeroy Jeepkins is offline   Quote Quick Reply
Old 08-30-2012, 09:36 AM   #4
Jeeper
 
Join Date: Jan 2011
Location: Southern CA
Posts: 73
Images: 2
Quote:
Originally Posted by doclouie View Post
I would check the fuel pressure. Just having pressure does not mean it has enough pressure for the injectors. A fuel pump failure is much more common than the things you are looking into.
Thanks, The fuel pump is only about 6 months old. It could be, and that is where I started. She's only got a little over 101K miles so just getting broken in. Wouldn't it throw a code though?
TJ922 is offline   Quote Quick Reply
Old 08-30-2012, 09:39 AM   #5
Jeeper
 
Join Date: Jan 2011
Location: Southern CA
Posts: 73
Images: 2
Quote:
Originally Posted by Leeroy Jeepkins View Post
doesn't a misfire mean he has improper combustion in that cylinder? it's possible that OP may have over tightened and cracked the porcelain for that sparkplug causing it to ground out before combustion resulting in a misfire or maybe the plug was cracked from manufacturer. you may have created the code but the original problem still exists. find out which one is #2 and put an old plug in it. might be crankshaft position sensor as the original problem
I pulled the coil rail off, and inspected everything, (more thinking that I did not get the spark plug boot on correctly) when I pulled the old plugs out # 3 sparkplug cracked in the socket, and I had a two piece spark plug. The cylinders are getting fuel. I pulled a plug, after craking it over, and it was moist.
TJ922 is offline   Quote Quick Reply
Old 08-30-2012, 10:09 AM   #6
Newb
 
Join Date: Aug 2012
Posts: 1
Did you ever figure it out? I had the same problem a few weeks ago with mine not starting and it turned out to be the crankshaft position sensor. Wouldn't hurt to pull it off and check it out. My sensor was in contact with the crank and it was actually grinding it away.
Jmh1789 is offline   Quote Quick Reply
Old 08-30-2012, 10:51 AM   #7
Jeeper
 
mickeygriffin's Avatar
 
Join Date: May 2012
Posts: 151
I changed my mani, now mine wont start. I dont have a clue....
__________________
iWave when iPass
97 TJ, 4cyl
mickeygriffin is offline   Quote Quick Reply
Old 08-30-2012, 12:07 PM   #8
Jeeper
 
Join Date: Jan 2011
Location: Southern CA
Posts: 73
Images: 2
I got p***ed off, and sent her to the mechanic.
TJ922 is offline   Quote Quick Reply
Old 08-31-2012, 10:59 AM   #9
Jeeper
 
Join Date: Jan 2011
Location: Southern CA
Posts: 73
Images: 2
She's running! Crank position sensor. I had a feeling it was either the Cam, or Crank position sensor.

Thanks for all of your input folks!

No more Camary!
TJ922 is offline   Quote Quick Reply
Old 08-31-2012, 11:02 AM   #10
Jeeper
 
Join Date: Jan 2011
Location: Southern CA
Posts: 73
Images: 2
Quote:
Originally Posted by mickeygriffin View Post
I changed my mani, now mine wont start. I dont have a clue....
You changed your manifold? Intake, I assume.

What is it doing?
TJ922 is offline   Quote Quick Reply
Old 08-31-2012, 01:37 PM   #11
Jeeper
 
mickeygriffin's Avatar
 
Join Date: May 2012
Posts: 151
Quote:
Originally Posted by TJ922 View Post
She's running! Crank position sensor. I had a feeling it was either the Cam, or Crank position sensor.

Thanks for all of your input folks!

No more Camary!

Whats up with the Crank position sensor?

__________________
iWave when iPass
97 TJ, 4cyl
mickeygriffin is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

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.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
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

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




» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 09:18 PM.



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