2 shops 5 mechanics and a 'star' tech..No clue why misfire - JeepForum.com
Reply
 
LinkBack Thread Tools
post #1 of 46 Old 10-24-2011, 11:47 PM Thread Starter
ljones628
Registered User
2004 TJ Wrangler 
 
Join Date: Oct 2011
Location: clayton
Posts: 17
2 shops 5 mechanics and a 'star' tech..No clue why misfire

I have a 04 wrangler TJ-Unlimited. 4.0L 6I. 100340 miles

It is throwing misfire in 1 and 2 codes. Jeep and my mechanic can't figure out why it's misfiring...it usually only misfires in idle - but if it does out of idle its at about 55mph. The check engine light is on and last night it started flashing at me repetitive and the truck started running like it did with the failed lifter. I continued to accelerate (figuring either will total it out and i'm done with it or would cause another symptom to help figure it out). It went back to running its "normal" after couple mins. I have been dealing with this for bout 6 weeks now. It ran great for 1k miles after the lifter job...ANY IDEAS WILL BE GREAT!! :


List of what has been repaired so far:

Valve lifters (12) replaced

Heads checked(apparently not valves though)

Heads reurfaced

Thermostat

Thermostat gasket and housing

New plugs

New coil pack

Fuel injectors cleaned

Battery

Fluids changed


List of what's been checked:

Fuel pump, lines, injectors

Plugs

Coil pack

PCM

Compression

Timing

Can't find any leaks (intake/outake)

Can't remember rest off hand...

ljones628 is offline  
Sponsored Links
Advertisement
 
post #2 of 46 Old 10-25-2011, 12:03 AM
lookmanohands
Registered User
1997 TJ Wrangler 
 
Join Date: Oct 2008
Location: Delavan
Posts: 104
I had a similar problem for the longest time and threw lots of new parts on as well. Rebuilt head, wires, plugs, injectors, cap and rotor. Misfire on cylinders 1 and 6 every time, and it would usually pop when I idled for a little while. It ended up being for me that the bolts on the underside of the intake/exhaust manifold were loose. I traced a slight whistle noise with a stethoscope to the underside of the intake and checked the bolts. They were loose enough to twist by hand. I think they had somehow worked loose over time after the head was replaced. Maybe like when they tell you to re-check the tightness of bolts when you replace suspension components. Worth a try.
lookmanohands is offline  
post #3 of 46 Old 10-25-2011, 12:55 AM
Heath
Registered User
2014 JK Wrangler 
 
Join Date: Mar 2010
Location: Shreveport
Posts: 2,641
Camshaft position sensor module?

2013 JKU Rubicon
Heath is offline  
post #4 of 46 Old 10-25-2011, 06:38 AM
LJameson
Registered User
1990 YJ Wrangler 
 
Join Date: Jun 2008
Location: Central Oregon!
Posts: 3,829
Did you put in a new cam with those lifters?

1990 YJ-The wheeler
2015 JK- The DD
LJameson is offline  
post #5 of 46 Old 10-25-2011, 08:20 AM
chris142
Registered User
2002 TJ Wrangler 
 
Join Date: Jul 2010
Location: Apple Valley,Ca
Posts: 3,265
What kind of spark plugs were used? How was the head checked? Did they measyre the springs and ck them for being broken?
chris142 is offline  
post #6 of 46 Old 10-25-2011, 08:29 AM
Jerry Bransford
Administrator
 
Jerry Bransford's Avatar
2004 TJ Wrangler 
 
Join Date: Jan 2003
Location: Escondido, California
Posts: 64,339
I'm not pointing my fingers at the plugs yet but exactly what model spark plugs are you running and when were they replaced? Before or after the misfire started?

Getting Savvy...

When you have a choice, buy American.
Jerry Bransford is online now  
post #7 of 46 Old 10-25-2011, 12:26 PM
herbiehind
Registered User
1999 TJ Wrangler 
 
Join Date: Nov 2009
Location: mass.
Posts: 1,106
leak down test done?
herbiehind is offline  
post #8 of 46 Old 10-25-2011, 01:16 PM
loaderopp
Registered User
2005 LJ Wrangler 
 
Join Date: Dec 2009
Location: Edmonton
Posts: 788
I would move a spark plug and see if it moves the miss fire.....I had one bad plug out of 6 brand new.

Built not bought!!!
2005 Rubicon Unlimited, 5.5 inch custom long arm, 1 inch daystar body lift, River Raider Snorkel, Custom bumper/winch mount, sliders, tire carrier. 37x13.50 R17 Nitto Mudgraplers, Bushwacker flat fender. Custom 1/2 cab. Hyline hood vents. Custom tonnue cover and tool box. HID-X off road lights, LED driving lights custom rear bumper/m6000 rear monted winch.
loaderopp is offline  
post #9 of 46 Old 10-25-2011, 02:57 PM
j_niko
Registered User
2009 JK Wrangler 
 
Join Date: Nov 2009
Location: Cleveland
Posts: 1,170
Cam lobe starting to wear down? That usually will cause an occasional backfire though.

2000 - Sahara
1997 - Sahara
j_niko is offline  
post #10 of 46 Old 11-01-2011, 10:17 PM Thread Starter
ljones628
Registered User
2004 TJ Wrangler 
 
Join Date: Oct 2011
Location: clayton
Posts: 17
Yes cam been checked they said was good not new though.... spark plugs were in before lifter work done truck ran great for thousand miles after lifter work...the heads were resurfaced so the new gasgets would sit right I know they didn't check valves unknown on springs... can't find air leak..
ljones628 is offline  
post #11 of 46 Old 11-01-2011, 10:19 PM Thread Starter
ljones628
Registered User
2004 TJ Wrangler 
 
Join Date: Oct 2011
Location: clayton
Posts: 17
They put new cam sensor on and it still ran the same...

Jeep is now starting to run worse it sounds like a train in a sense with a hiss at times. It only does it in the mornings though. With or without warm up.
ljones628 is offline  
post #12 of 46 Old 11-01-2011, 10:23 PM
Boodyrider
Registered User
1997 TJ Wrangler 
 
Join Date: Feb 2008
Location: Maryland
Posts: 2,526
Put in 6 new double platinum plugs, just try it.

97 TJ Sport - 4.0/HP D30 w ARB/8.8 w LS/4.88s; 35s and flat fenders on 2.5 lift

84 CJ7; frame off restoration in progress.

The technical advice you get from me here is worth exactly what you paid me for it. Warranty issues will be reimbursed at double what you paid me for the advice.
Boodyrider is offline  
post #13 of 46 Old 11-01-2011, 10:23 PM
ColoradoCole
Registered User
2000 TJ Wrangler 
 
Join Date: Feb 2010
Location: Denver
Posts: 545
what do you mean by hiss ?
ColoradoCole is offline  
post #14 of 46 Old 11-01-2011, 10:25 PM Thread Starter
ljones628
Registered User
2004 TJ Wrangler 
 
Join Date: Oct 2011
Location: clayton
Posts: 17
Tension pulley seems loose to me....the bolt on left side closest to firewall on top side the nut is not even touching the tip of valve cover I know certain order of tightening but can I redo that one without all the others? Can't hear air or not due to engine bouncing and loud chug sound
ljones628 is offline  
post #15 of 46 Old 11-01-2011, 10:29 PM Thread Starter
ljones628
Registered User
2004 TJ Wrangler 
 
Join Date: Oct 2011
Location: clayton
Posts: 17
I'll get plugs and try it

Hiss like have a air leak on right side but can't find it
ljones628 is offline  
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.



Email Address:
OR

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
random cylinder misfire, misfire 1,2,4,5,6? f100ranger TJ Wrangler Technical Forum 11 07-23-2011 09:56 PM
Error code P0306 misfire... but no misfire??? TJeep_1999 TJ Wrangler Technical Forum 4 06-03-2011 09:43 AM
Have No Clue???? mbojaj YJ Wrangler Technical Forum 24 01-13-2009 09:51 PM
Must Teach the Mechanics - For the love of God HELP (misfire problem) JeepsInParadise TJ Wrangler Technical Forum 11 08-18-2008 12:55 PM
I have no clue rubicon54 TJ Wrangler Technical Forum 3 11-14-2006 07:15 AM

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 On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome