Error Code Help - JeepForum.com

 
LinkBack Thread Tools
post #1 of 6 Old 05-02-2013, 08:29 PM Thread Starter
0verkillYJ
Registered User
1995 YJ Wrangler 
 
Join Date: Dec 2012
Location: Philly
Posts: 179
Error Code Help

I have an occasional low idle and error codes 51, 21, & 14. Anyone know what would cause all three of these error codes at the same time? Jeep is driving fine. No loss of power or anything. Just 1 in ever 10 times I stop or so id idles down around 600 rms. I would replace the MAP sensor, but sine I have the two other codes at the same time I am not sure if something else may be to blame.


95 YJ, 2.5 AX15 conversion, 4.0 TB, SOA +1.5", 33" DC Crusher Tires, 8.8 Rear w/welded tubes + LSD, Spartan Locker HP30 Front w/solid axle swap, Rocky Road OTT kit, JKS Disconnects, AA SYE, Teraflex Shock Bar in Rear, 1/2" Boomerang Shackles, RE Add a Leafs, Homebrew Traction Bar, Monstalined in&out, LED Tail lights, 1700 Watt Stereo
0verkillYJ is offline  
Sponsored Links
Advertisement
 
post #2 of 6 Old 05-02-2013, 09:38 PM
bigbossd1030
Registered User
1995 YJ Wrangler 
 
Join Date: Feb 2010
Location: Edmonton, AB
Posts: 2,514
51 is the air to fuel mixture is wrong and 21 is the o2 sensor. And 14 as you know is the map sensor. Change your o2 sensor and reset toe computer. Drive it for a while and see if it changes at all.

Sent from my iPhone using JeepForum

Edit: 51 is a lean mixture.

/l ,[____],
l----L-[]lllllll[]-
()_)-()_)--o)_)

OFFICIAL JEEPER
Any Jeepers in Edmonton, AB
I am on channel 33.

I live, I ride, I am JEEP.
bigbossd1030 is offline  
post #3 of 6 Old 05-03-2013, 07:19 AM Thread Starter
0verkillYJ
Registered User
1995 YJ Wrangler 
 
Join Date: Dec 2012
Location: Philly
Posts: 179
Yeah, I know what the codes are. My O2 sensor has less than 5k miles on it. I replaced it last year. I wasnt sure if a clogged injector could cause this. I figure it could cause the lean conditions, but am confused about the MAP sensor code.

51 O2S signal stays below center (lean)
21 O2S stays at center or O2S shorted to voltage
14 MAP sensor voltage too low or too high

95 YJ, 2.5 AX15 conversion, 4.0 TB, SOA +1.5", 33" DC Crusher Tires, 8.8 Rear w/welded tubes + LSD, Spartan Locker HP30 Front w/solid axle swap, Rocky Road OTT kit, JKS Disconnects, AA SYE, Teraflex Shock Bar in Rear, 1/2" Boomerang Shackles, RE Add a Leafs, Homebrew Traction Bar, Monstalined in&out, LED Tail lights, 1700 Watt Stereo
0verkillYJ is offline  
post #4 of 6 Old 05-03-2013, 10:10 AM
Siva283
Registered User
1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters
Posts: 3,745
Quote:
Originally Posted by 0verkillYJ View Post
Yeah, I know what the codes are. My O2 sensor has less than 5k miles on it. I replaced it last year. I wasnt sure if a clogged injector could cause this. I figure it could cause the lean conditions, but am confused about the MAP sensor code.

51 O2S signal stays below center (lean)
21 O2S stays at center or O2S shorted to voltage
14 MAP sensor voltage too low or too high
Swap your O2. They go bad easily. Sometimes they last forever sometimes the die quick. For the Map code you NEED to check your vac lines for leaks. The smallest vac leak can wreak havoc on these engines.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
Siva283 is offline  
post #5 of 6 Old 05-03-2013, 10:11 AM
Siva283
Registered User
1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters
Posts: 3,745
A Vac line I capped off caused mine to throw TPS codes. Fixed the line codes gone and engine runs great. You can spray carb cleaner by them and listen for an idle change. If the idle changes you have a leak there.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
Siva283 is offline  
post #6 of 6 Old 05-03-2013, 02:14 PM Thread Starter
0verkillYJ
Registered User
1995 YJ Wrangler 
 
Join Date: Dec 2012
Location: Philly
Posts: 179
Quote:
Originally Posted by Siva283 View Post
A Vac line I capped off caused mine to throw TPS codes. Fixed the line codes gone and engine runs great. You can spray carb cleaner by them and listen for an idle change. If the idle changes you have a leak there.
You know I capped the line that went to the CAD recently. Didn't even think to check it. I thought I sealed it good, but maybe I should have done a better job. I will check that and also use some epoxy to seal it. That should fix it for good.

95 YJ, 2.5 AX15 conversion, 4.0 TB, SOA +1.5", 33" DC Crusher Tires, 8.8 Rear w/welded tubes + LSD, Spartan Locker HP30 Front w/solid axle swap, Rocky Road OTT kit, JKS Disconnects, AA SYE, Teraflex Shock Bar in Rear, 1/2" Boomerang Shackles, RE Add a Leafs, Homebrew Traction Bar, Monstalined in&out, LED Tail lights, 1700 Watt Stereo
0verkillYJ 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