Codes Galore (where to start) - JeepForum.com
 
LinkBack Thread Tools
post #1 of 11 Old 07-16-2013, 08:18 AM Thread Starter
TRSXJ2000
Registered User
2000 XJ Cherokee 
 
Join Date: Jul 2013
Location: Morgantown
Posts: 14
Codes Galore (where to start)

Well I checked to see why my service light was on and wow there were alot of codes that poped up but now I have to figure out where to start any advice or if you have had any of theses problem chime in and tell me your experience you had and symtoms you were having when your problem started!!

code PO138 =Heated o2 sensor bank sensor

powertrain control module uses sensor to calculate the air/fuel ratio in exhaust

Cause= o2 sensor defective
fuel system running very rich or less lean
engine miss fire condition -repair
fuel pressure very high or low fuel pump or pressure regulator

code P1294= Target Idle not reached
ECM dectected idle speed not within specified range

Cause= mechanical condition on Vacuum leak
Throttle Cable not free
Idle speed screw misadjusted

Code PO303= cylinder 3 misfire
Cause= Ignition system fault spark plug ignition wires, coils
vacuum leak
injector fault
high orlove fuel pressure

Code PO505= Idle speed higher/lower than expected
Cause=vacuum leak
dirty throttle body
Iac motor defective
poor electrical connection to IAC

And on top of all this I was looking thismorning and Im almost sure I have a valve gasket leak very small!
any help on where you would start on this would be greatly appreciated!!

thanks in advance

TRSXJ2000 is offline  
Sponsored Links
Advertisement
 
post #2 of 11 Old 07-16-2013, 09:33 AM
gs69350
Registered User
1998 ZJ 
 
Join Date: Aug 2012
Location: Sellersburg
Posts: 327
The 0138 probably won't cause anything that you would notice.

The 0303 is probably causing the 0505 and 1294.

Start with cheap and easy, take the plug out and inspect, and inspect the wire to make sure no worn spots where it can arc.

1998 Jeep Grand Cherokee 5.9 Limited - Stone White - Stock for now.
http://www.facebook.com/groups/59limited/ <-- 5.9 Owner's group on FB.
gs69350 is offline  
post #3 of 11 Old 07-16-2013, 09:56 AM Thread Starter
TRSXJ2000
Registered User
2000 XJ Cherokee 
 
Join Date: Jul 2013
Location: Morgantown
Posts: 14
ok I will do this and get back to tell you what I discovered thanks for reply
TRSXJ2000 is offline  
post #4 of 11 Old 07-16-2013, 11:25 AM
CJ7-Tim
Real Jeeps have dents
 
CJ7-Tim's Avatar
2000 XJ Cherokee 
 
Join Date: Apr 2002
Location: out in the garage - Minneapolis
Posts: 24,502
Always start diagnostics/repairs with the lowest numbered Check Engine Light (CEL) trouble code. Often whatever is faulty and causing the lowest number code, is also causing bad data or some other engine issues that make the higher number codes illuminate the CEL.

A P0138 can cause all sorts of issues, including a very rich mixture, cat converter troubles, and bucking, stalling, or backfiring of the engine.


Fix the P0138, erase the codes, and see if any other codes come back.

.

A recent Gallup public opinion poll shows the NRA, at 58% approval, has a higher approval rating than either Hillary Clinton or Barack Obama.

Progressive Liberalism: Bringing you new Healthcare ideas so wonderful, they have to include mandatory participation ...

Originally Posted by Ronald W. Reagan: Government is not the solution to our problems; Government is the problem.
CJ7-Tim is offline  
post #5 of 11 Old 07-16-2013, 11:41 AM
CCKen
Web Wheeler
 
CCKen's Avatar
1999 XJ Cherokee 
 
Join Date: Jul 2011
Location: Canton
Posts: 3,249
You didn't state what year your XJ is, but going by your handle I would think you have a 2000. If so, check the Oxygen Sensors relay 20 Amp mini fuse in the Power Distribution Center. It's identified in this photo as O2S Relays. This may address the P0138.

CCKen is online now  
post #6 of 11 Old 07-16-2013, 12:50 PM Thread Starter
TRSXJ2000
Registered User
2000 XJ Cherokee 
 
Join Date: Jul 2013
Location: Morgantown
Posts: 14
thank you for your reply and all your help I will fix the P0138 code and respomd back with results
TRSXJ2000 is offline  
post #7 of 11 Old 07-16-2013, 12:54 PM Thread Starter
TRSXJ2000
Registered User
2000 XJ Cherokee 
 
Join Date: Jul 2013
Location: Morgantown
Posts: 14
I was just reading about this on the net and I decided to check back on my question to see if any more responses had come threw Im glad you chimed with your information very helpful Ill let you know what I find out thanks

you were right my jeep is a 2000

Last edited by TRSXJ2000; 07-16-2013 at 12:55 PM. Reason: adding text
TRSXJ2000 is offline  
post #8 of 11 Old 07-17-2013, 09:53 AM Thread Starter
TRSXJ2000
Registered User
2000 XJ Cherokee 
 
Join Date: Jul 2013
Location: Morgantown
Posts: 14
I check fuse everything is ok with that!!
TRSXJ2000 is offline  
post #9 of 11 Old 07-17-2013, 09:53 AM Thread Starter
TRSXJ2000
Registered User
2000 XJ Cherokee 
 
Join Date: Jul 2013
Location: Morgantown
Posts: 14
o2 sensors on the way!!
TRSXJ2000 is offline  
post #10 of 11 Old 07-17-2013, 09:55 AM Thread Starter
TRSXJ2000
Registered User
2000 XJ Cherokee 
 
Join Date: Jul 2013
Location: Morgantown
Posts: 14
wire great and plug is fine !!
TRSXJ2000 is offline  
post #11 of 11 Old 07-17-2013, 10:01 AM Thread Starter
TRSXJ2000
Registered User
2000 XJ Cherokee 
 
Join Date: Jul 2013
Location: Morgantown
Posts: 14
Now I think I found some major issues thismorning that is causing all theses codes as well or I should say it wasnt help the codes at all!! I looked at manifold thismorning and there are 2 bolts missing out of it! that would create a vacuum leak and im asumming exhaust leak!! Could anyone inform me on the size and where to source then I callled autozone they said they couldnt get them and I went to ace hardware and they have none as well any advice it would help me out alot thanks in advance!!

Next there is oil laying on the top around valve cover so im asumming that it might need a valve cover gasket and I got checkin the bolts and they were only hand tightened!! I tightedthem up and it seems to be actually running smoother than it was!!
TRSXJ2000 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