This is a discussion on Frost? within the Computer & Tuning forums, part of the LSx Technical Help Section category; I am getting P0131 and P0151 codes and cars not pulling hard at all. Replaced O2's and they were destroyed ...
09-26-2009, 01:50 PM #1
I am getting P0131 and P0151 codes and cars not pulling hard at all. Replaced O2's and they were destroyed in 1 full throttle. Covering the FTRA and putting a rag over half the air filter helped it by a good bit. So, that means I am super lean doesn't it, that hot of exhaust would fry a O2 quick wouldn't it. I have a year warrenty on the O2's so not worried about that. Can I send the computer back to you for a update or something? Am I right about the lean condition?┌∩┐(◕_◕)┌∩┐
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09-26-2009, 03:49 PM #2
Get a tune 'in person' for HCI swaps. Unless you have HPT and WB, nailing a tune threw snail mail is next to impossible.
09-26-2009, 05:44 PM #3
09-26-2009, 07:45 PM #4
It's true that it needs to be in front of a tuner, but those codes aren't tune related. Being too lean won't hurt O2s, being too fat will. I clean the tips with a torch; they aren't heat sensitive in that fashion. Basically what I'm saying is that the O2 problems have nothing to do with mixture.
09-26-2009, 08:17 PM #5
09-26-2009, 08:20 PM #6
Oh and one more thing I forgot. I thought it was lean because we plugged off my FTRA and covered half the air filter with a rag and it made a noticeable difference in SOTP to me and my 2 other buddies that took rides/drives.
09-28-2009, 12:01 AM #7
Ok, I have did a lot and I mean ALOT of searching and come Tuesday me and my buddy are:
1: Pull a spark plug and see if its white (lean)
2: Pull a O2 and look at it.
3: Check Fuel Pressure at the rail
4: Check all intake fittings after the MAF for tightness
5: Spray down engine compartment with brake clean to check for vacuum leaks
6: Clean the MAF
7: Undo battery and reset codes
8: Take it for a spin
Hopefully I can get this thing going in tip top shape
09-28-2009, 05:58 AM #8
You can't read plugs like that in a car with closed loop control. They ALL look white from part throttle fueling doing it's switching.
To read WOT plugs, the car MUST be in OL, you must use new plugs and make a pull to the top of a gear and immediately shut down the engine. Now you pull a plug and check it.
Really though, if you want to check AFR you have to use a wideband. You really can't get around this.
09-28-2009, 06:18 AM #9
09-28-2009, 08:53 AM #10
I don't understand so help me out... how do you know the car is lean if it hasn't seen a wideband? Do you still have the ported MAF on the car?
p0131 is low voltage to the front driver's side O2. Most usual causes are:
2. failed MAF (that doesn't code)
3. exhaust leak
p0131 can mimic a lean condition because the NBs read low. The fact that it's set on one side of the engine and not the other points to conditions 1 or 3 above though as very likely candidates though.
09-28-2009, 12:15 PM #11
09-28-2009, 12:56 PM #12
As far as I know you cant use a LT1 MAF. Also I don't think you want to go crazy spraying break cleaner in your engine compartment. That shit can take pant off and more than likely dry out your rubber hoses.
I am thinking it is a failed MAF or a vacuum leak. I would look at the o-rings on the intake. How does it idle? High?
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09-28-2009, 01:08 PM #13
09-28-2009, 03:07 PM #14
Maybe starting fluid or carb cleaner.
09-28-2009, 03:17 PM #15
09-28-2009, 04:36 PM #16
I am blind I don't see it anywere.
09-28-2009, 04:45 PM #17
09-28-2009, 04:50 PM #18
09-28-2009, 04:51 PM #19
Oh, and besides the luck......Thanks for your input everyone, especially Frost. to all.
09-28-2009, 05:14 PM #20
If you have the TechII, get a running scan. If it is high, the fuel trimming will be all very highly +
You won't have LTFTs, so look to the STFTs after the car is up to full temp.
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