On September 22nd, 2006 my 18,000 mile old LS1 that came in my GTO literally grenanded.

Here is the old thread:

http://www.ls1gto.com/forums/showthread.php?t=107188

The outcome of that situation was a new LS1 Long Block was installed in my car,under dealership warranty. The dealership did a great job. Only issue was a freeze plug leak that some GM Stop Leak tabs took care of.

A week later, I loaded my custom DiabloSport Predator Tune back into my new engine's ECU.

About Mid-November I decided to make sure I had no DTC's set at all. I plugged in the Predator and noticed it had a P0172 Fuel Trim Rich Bank 1 Code. I cleared the DTC code and then reset my ECU.
I had no Check Engine Light displayed.

Yesterday (Dec 18th) I decided to check things again. This time I have a P0175 Fuel Trim Rich Bank 2 code. I had no Check Engine Light displayed. So I got pissed off and decided to try to trouble shoot.

Here is what I did:

1) Took air intake system off and checked my OEM air filter, pipe, etc for any leaks.

No leaks were found.

2) I cleaned my MAF with alcohol. Barely any dirt on the wires, but there was dirt that came off when I wiped the inside of the MAF down with alcohol. I then sprayed the MAF with compressed air.

3) I reinstalled everything snug, and reset my ECU.

4) I then began looking for leaks after the MAF. The bolts where the throttle body bolts onto the intake manifold were snug. I could hear air running through the throttle body when I put my ear up to it, I assume this is normal.

5) I went and got some SeaFoam (injector cleaner) and dropped it into my gas tank. I was thinking that maybe an injector has junk in it. I ran the car around for a bit. I then tapped each injector with a screwdriver and a hammer to possibly loosen anything up that was stuck in the injector head.

These codes are usually the result of running too rich in Closed Loop (non wide open throttle):
Root Cause can sometimes be:
1) Vaccuum Leak
2) Leaking Fuel Regualtor (How do I check that one?)
3) Stuck open injector
4) Bad O2 Sensor?
5) Bad Tune?

My LTFT's at WOT are 0.00, and at 55mph, they are ~-3.00

At idle, with my car parked my 02 Mv's are between 40-840mv's

My oil does not smell like gas and my exhaust tips are clean.

I am not sure where to proceed, I was thinking maybe when my engine exploded it messed up the 02 sensors, covering them with oil, coolant, etc, but I'm not sure.

Could my original engine and my new engine be so different that the tune is causing this?

Any other tests I can do?

Any help you guys can give me would be appreciated!

I want to do as much as I can before I resort to taking the car into the shop.

As of this morning, the code has not come back. My mods are in my signature.

Thank you!
-Nick
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2004 GTO A4 (~314 wrhp)
Performance:
- RWTD Custom Tune / Predator Handheld
- JHP HSV MAF Pipe - SLP Midlength Headers
- MSD Ignition Wires - !Maf Screen
- TB Coolant ByPass
- 18" Magnesium Drift R's(275 Back/245 Front)
- PowerSlot Slotted Rotors -
- Corvette EBC Red Stuff Pads -
- Holden Lightweight Skid Guard

Show:
- Tint - Sub/Amp/Cap - 8000k HID's
- Valentine One