CEL P1131 code

Loki · June 17th, 2011, 10:35 AM

Hey, I finally popped up a code RIGHT before I was going to go through emissions. Lol. It's P1131, I think it said I'm running lean. I've been thinking about this for a couple days now, but when I ordered my tune a couple months ago, I got it for 21 lb injectors, because thats what I read the 99's used, but a couple days ago, i ran into somewhere saying they were 19lb. Could this be my problem? Being tuned for the bigger injectors? Which is right for 99, 21 or 19? Any help or input appreciated!

01 Slate Stang · June 17th, 2011, 11:00 AM

19 LBS for 99 model

SlowSix · June 17th, 2011, 11:12 AM

Yeah that is definitely something I would fix. If you clear it and it comes back after that check your car for a vacuum leak.

Loki · June 17th, 2011, 11:24 AM

Son of a bitch. Lol, I thought so. Thanks, guys!

Oh, Silver, I definitely have no leaks. When I did my swap, I replaced all the gaskets and cleaned everything up inside. I'll double check just in case, but I'm pretty confident on my work.

Cars running great, tho! =] Feels good to be driving again

mustangmike! · June 17th, 2011, 01:36 PM

O2 sensor bank1 sensor 1

Loki · June 17th, 2011, 07:58 PM

I know that, but considering what I mentioned in the first post, im pretty confident thats the base of my problem & why it threw the code

mustangmike! · June 17th, 2011, 08:19 PM

yup, re order a tune for 19#

Loki · June 17th, 2011, 09:48 PM

Already done =] I probably shouldn't drive it in the meantime. This is really killing me, I just want to drive my car already >_< The CEL did turn off when I drove a bit more aggressive, but I know the problem is still there. SO, I guess I wait another week. Lol. Thanks for the input, guys

bigjohnstud4200 · June 17th, 2011, 10:06 PM

Can't you reapply the stock tune for now?

Loki · June 17th, 2011, 11:49 PM

Stock tune would be worse! Lol, I have a 96 with a SP swap. Stock tune is 14lb injectors and I run extremely rich!

bigjohnstud4200 · June 18th, 2011, 10:07 AM

Originally Posted by Loki

Stock tune would be worse! Lol, I have a 96 with a SP swap. Stock tune is 14lb injectors and I run extremely rich!

Ahhh, well that bites!

Loki · July 10th, 2011, 11:23 PM

Okay, so I switched the tune for the correct injector size & I am still getting the code. It's stopping me from passing emissions. I'm thinking that the injectors might be a little clogged (They are from the jy engine, which had dirt clumps on top of the pistons when I took it apart. Lol). I think I might just try some injector cleaner and see if that helps. Just something I noticed, though, is that it shuts off when I drive aggressive. That's why I'm thinking it may be the fuel injectors. More fuel pressure maybe helps it flow better?

June 17th, 2011, 10:35 AM	#1
Loki Enthusiast 1996 V6 Join Date: Feb 2011 Location: Connecticut Posts: 632 iTrader: 0 reviews	CEL P1131 code Hey, I finally popped up a code RIGHT before I was going to go through emissions. Lol. It's P1131, I think it said I'm running lean. I've been thinking about this for a couple days now, but when I ordered my tune a couple months ago, I got it for 21 lb injectors, because thats what I read the 99's used, but a couple days ago, i ran into somewhere saying they were 19lb. Could this be my problem? Being tuned for the bigger injectors? Which is right for 99, 21 or 19? Any help or input appreciated!

June 17th, 2011, 11:00 AM	#2
01 Slate Stang Regular 2001 Mustang 0 - 60 5 minutes Join Date: Oct 2010 Location: Arkansas Posts: 83 iTrader: 0 reviews	19 LBS for 99 model __________________ Famous people walk on red carpet because they are rich... I walk on toilet paper because I'm the shit

June 17th, 2011, 11:12 AM	#3
SlowSix Formerly 01silversixer 2001 V6 15.47@89.57 Join Date: May 2010 Location: Pittsburgh, PA Posts: 3,471 iTrader: 1 reviews	Yeah that is definitely something I would fix. If you clear it and it comes back after that check your car for a vacuum leak. __________________ Build Thread

June 17th, 2011, 01:36 PM	#5
mustangmike! I Post Entirely Way Too Much 2004,1994,1967 14.37 @ 96 Join Date: Aug 2008 Location: Texas Posts: 6,018 iTrader: 1 reviews	O2 sensor bank1 sensor 1 __________________ 227whp N/A V6 Now w/ 8th Mile 8s ! How To Jmod Your Late Model 4R70W

June 17th, 2011, 08:19 PM	#7
mustangmike! I Post Entirely Way Too Much 2004,1994,1967 14.37 @ 96 Join Date: Aug 2008 Location: Texas Posts: 6,018 iTrader: 1 reviews	yup, re order a tune for 19# __________________ 227whp N/A V6 Now w/ 8th Mile 8s ! How To Jmod Your Late Model 4R70W

June 17th, 2011, 11:24 AM	#4
Loki Enthusiast 1996 V6 Join Date: Feb 2011 Location: Connecticut Posts: 632 iTrader: 0 reviews	Son of a bitch. Lol, I thought so. Thanks, guys! Oh, Silver, I definitely have no leaks. When I did my swap, I replaced all the gaskets and cleaned everything up inside. I'll double check just in case, but I'm pretty confident on my work. Cars running great, tho! =] Feels good to be driving again

June 17th, 2011, 07:58 PM	#6
Loki Enthusiast 1996 V6 Join Date: Feb 2011 Location: Connecticut Posts: 632 iTrader: 0 reviews	I know that, but considering what I mentioned in the first post, im pretty confident thats the base of my problem & why it threw the code

June 17th, 2011, 09:48 PM	#8
Loki Enthusiast 1996 V6 Join Date: Feb 2011 Location: Connecticut Posts: 632 iTrader: 0 reviews	Already done =] I probably shouldn't drive it in the meantime. This is really killing me, I just want to drive my car already >_< The CEL did turn off when I drove a bit more aggressive, but I know the problem is still there. SO, I guess I wait another week. Lol. Thanks for the input, guys

June 17th, 2011, 11:49 PM	#10
Loki Enthusiast 1996 V6 Join Date: Feb 2011 Location: Connecticut Posts: 632 iTrader: 0 reviews	Stock tune would be worse! Lol, I have a 96 with a SP swap. Stock tune is 14lb injectors and I run extremely rich!

July 10th, 2011, 11:23 PM	#12
Loki Enthusiast 1996 V6 Join Date: Feb 2011 Location: Connecticut Posts: 632 iTrader: 0 reviews	Okay, so I switched the tune for the correct injector size & I am still getting the code. It's stopping me from passing emissions. I'm thinking that the injectors might be a little clogged (They are from the jy engine, which had dirt clumps on top of the pistons when I took it apart. Lol). I think I might just try some injector cleaner and see if that helps. Just something I noticed, though, is that it shuts off when I drive aggressive. That's why I'm thinking it may be the fuel injectors. More fuel pressure maybe helps it flow better?

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