Tired of Code Chasing! - Page 2 - JeepForum.com

Reply
 
LinkBack Thread Tools
post #16 of 29 Old 07-12-2014, 05:37 AM Thread Starter
ravensfan1976
Registered User
 
Join Date: Jul 2014
Location: Reisterstown
Posts: 14
Quote:
Originally Posted by Duh View Post
My tj had wires and a distributor, but didnt the newer 4.0 switch to coil packs? I could be wrong on my memory. I dont know on his specific year.
I have an '02 and it's a coil rail. I replaced that already since I kept getting the same three codes 0300, 0303, and 0304 every time. Once I replaced that the codes stopped for a couple weeks and came back.

I noticed some broken zip ties on the harness I moved away from the block so I really need to do an extensive inspection on the wiring. So far it's looking like I at least stopped the 0420 and the specific 3 & 4 cylinder codes. I'll run it for a few days and see what comes up and inspect the harnesses as I go to see if there's any other indications.

ravensfan1976 is offline  
Sponsored Links
Advertisement
 
post #17 of 29 Old 07-12-2014, 06:54 AM
asatxj
Registered User
 
asatxj's Avatar
2001 WJ 
 
Join Date: Jan 2004
Location: West Michigan
Posts: 1,002
Go to wjjeeps.com and do some reading about how/when codes pop up. that will help you understand how that works, your issues aren't temporarily going away, it's how the system recognizes them. Plenty of important knowledge there for those of us who don't like paying for stuff we can do.

Jeep Fleet Maintenance Director
'00 WJ, son's Jeep,'01 WJ mine, '04 TJ, brother's Jeep,00 WJ daughter's
Maintain your stuff so you don't have to fix your junk
ASAT= All Season All Terrain
asatxj is offline  
post #18 of 29 Old 07-21-2014, 09:09 AM Thread Starter
ravensfan1976
Registered User
 
Join Date: Jul 2014
Location: Reisterstown
Posts: 14
So I went ahead and had my local Jeep dealership do a diagnostic test on it and apparently it needs a Crankshaft Position Sensor and a Transfer Case Control Switch. Naturally for parts and labor they wanted over $700, but I'm going to take this one on myself. From what I'm reading the CPS is a bit of a pain.
ravensfan1976 is offline  
post #19 of 29 Old 07-21-2014, 09:50 AM
WXman
Registered User
2001 WJ 
 
Join Date: Jun 2003
Posts: 3,517
The CPS isn't a cake walk. But it's not impossible either. Did mine a couple months ago from under the Jeep by using extensions and swivels. You can put your fingers on it from under the hood and feel it...but there is a bracket in the way that makes it hard to get the socket onto the bolt. So going up from under the Jeep is easiest. Took about 30 minutes or so on mine.

'92 YJ - heavily modded
'96 ZJ - heavily modded
'05 KJ CRD Limited - 370 lb./ft. from a 4-cylinder and trail ready. Pure awesomeness.
'11 Mango Tango JKU Sport - Mods
'12 Dozer JKU Sport S - 6-speed - ACE rock rails - Max Tow package - Daystar spacers - 33x12.50 Duratracs
WXman is online now  
post #20 of 29 Old 07-21-2014, 09:55 AM Thread Starter
ravensfan1976
Registered User
 
Join Date: Jul 2014
Location: Reisterstown
Posts: 14
Quote:
Originally Posted by WXman View Post
The CPS isn't a cake walk. But it's not impossible either. Did mine a couple months ago from under the Jeep by using extensions and swivels. You can put your fingers on it from under the hood and feel it...but there is a bracket in the way that makes it hard to get the socket onto the bolt. So going up from under the Jeep is easiest. Took about 30 minutes or so on mine.

Thanks for the heads up. Is the sensor something easy to spot from underneath or would it be easier to have an extra person on hand as guide if I have feel blindly for it since I'll need to use extensions and swivels to get to it?
ravensfan1976 is offline  
post #21 of 29 Old 07-22-2014, 07:29 AM
ChrisHager
Moderator
 
ChrisHager's Avatar
2004 WJ 
 
Join Date: Jan 2011
Location: Springfield
Posts: 8,534
Garage
Here are my thoughts on the Crankshaft Position Sensor: 2004 4.0 Crankshaft Position Sensor Replacement

~Chris
His: 2004 WJ - OME HD 'Kolak' Lift - Build Thread
His: 1979 J-10 - 3" on 33s - Build Thread
His: 2009 Expedition
His: 1978 F250 Custom - Build Thread
Hers: 2000 TJ
Hers: 2010 Jetta

ChrisHager's 'Grilled' Thread

Quote:
Originally Posted by Matt
"You can't recycle tartar sauce."
ChrisHager is offline  
post #22 of 29 Old 08-14-2014, 03:24 PM Thread Starter
ravensfan1976
Registered User
 
Join Date: Jul 2014
Location: Reisterstown
Posts: 14
Got both parts changed out. The Transfer Case Switch I was able to do myself. The Crankshaft position sensor was just too much of a pain no matter which way I tried. So I broke down and paid Merchant's $85 to do it lol.

Been a few days and other than some rough idling it's been running pretty well. No misfires as of yet *knocks on wood*
ravensfan1976 is offline  
post #23 of 29 Old 08-15-2014, 06:58 PM
Acc0919mc
Registered User
2000 WJ 
 
Join Date: Jan 2013
Location: East Palestine
Posts: 811
As for the missfire codes, I was chasing a few of them too. THEN it started hard starting, found out my fuel pump was only putting out around 8PSI. its suppose to be around 55PSI
Acc0919mc is offline  
post #24 of 29 Old 08-30-2014, 09:43 AM Thread Starter
ravensfan1976
Registered User
 
Join Date: Jul 2014
Location: Reisterstown
Posts: 14
Looks like I didn't knock on wood correctly haha. After two weeks of running well with no codes at all, I'm now getting the infamous P0420 code again. No misfire codes as of yet.

The interesting thing is that I didn't get the P0420 code until one day when I was sitting in traffic with the AC blowing and the engine temp gauge moved up and over 210. It didn't overheat thankfully, but I'm wondering if they're somehow tied together, even though the code came back after resetting, under normal driving conditions, and no high temp reading.
ravensfan1976 is offline  
post #25 of 29 Old 08-30-2014, 07:34 PM
HighOutput
Registered User
2003 WJ 
 
Join Date: Jun 2012
Location: Red Centre
Posts: 102
Did you change your 02 sensors?
HighOutput is offline  
post #26 of 29 Old 08-30-2014, 08:46 PM Thread Starter
ravensfan1976
Registered User
 
Join Date: Jul 2014
Location: Reisterstown
Posts: 14
Not yet. I think that will be my next project. I'm hoping it's just that and I don't have to replace the Cat.
ravensfan1976 is offline  
post #27 of 29 Old 08-31-2014, 02:37 AM
HighOutput
Registered User
2003 WJ 
 
Join Date: Jun 2012
Location: Red Centre
Posts: 102
^ Buy Denso, oem replacement.
HighOutput is offline  
post #28 of 29 Old 08-31-2014, 04:10 AM
86cj74.2L
Web Wheeler
 
86cj74.2L's Avatar
2004 WJ 
 
Join Date: Jul 2006
Location: Stouchsburg, PA
Posts: 10,171
Prolonged idle time will allow the CAT to cool off and turn off.

But try your rear down stream sensor. That is the sensor that checks CAT efficiency.
86cj74.2L is offline  
post #29 of 29 Old 10-02-2014, 05:25 PM Thread Starter
ravensfan1976
Registered User
 
Join Date: Jul 2014
Location: Reisterstown
Posts: 14
Ahhhh the codes never end lol. Now that the misfire codes are gone, the 0420 code disappeared on it's own for a few days, but recently came back with a 0352 and 1281 code.

I'm ready to just set the thing on fire and collect whatever insurance I can haha
ravensfan1976 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



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