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Unread 05-02-2013, 08:29 PM   #1
0verkillYJ
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1995 YJ Wrangler 
 
Join Date: Dec 2012
Location: Philly, PA
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.

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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
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Unread 05-02-2013, 09:38 PM   #2
bigbossd1030
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1995 YJ Wrangler 
 
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Location: Edmonton, AB, Alberta
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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.
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Unread 05-03-2013, 07:19 AM   #3
0verkillYJ
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1995 YJ Wrangler 
 
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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
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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
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Unread 05-03-2013, 10:10 AM   #4
Siva283
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1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters, WV
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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.
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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=Magnum;14117863] I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim[/QUOTE]

[QUOTE=ldso;16498409]. It started with a $200 axle, and a few thousand dollars later I was done :)[/QUOTE]

[QUOTE=Luuca;16122017]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]

[QUOTE=Overhead;17658665]this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.[/QUOTE]
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Unread 05-03-2013, 10:11 AM   #5
Siva283
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1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters, WV
Posts: 3,698
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.
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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=Magnum;14117863] I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim[/QUOTE]

[QUOTE=ldso;16498409]. It started with a $200 axle, and a few thousand dollars later I was done :)[/QUOTE]

[QUOTE=Luuca;16122017]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]

[QUOTE=Overhead;17658665]this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.[/QUOTE]
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Unread 05-03-2013, 02:14 PM   #6
0verkillYJ
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1995 YJ Wrangler 
 
Join Date: Dec 2012
Location: Philly, PA
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.
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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
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