Thread: vac leak? cat diagnostic?

I'm running an 05 pcm in an 07 GP n/a. Just installed headers yesterday. I've been trying to get this pcm running properly for about 2-3 months now, and i keep switching it back to stock (the 07 pcm cannot be tuned). I am running into the following issues with the 05...My fuel trims seem to be stuck at 16.4, but are not that way all the time. I am getting lots of KR (up to 8*) at medium throttle levels. I am wondering if someone can take a look at my scan. I have attached my scan and the tune that i have on the pcm. I also need some information on how to get out of VE tuning. I have heard that i should not be tuning with VE. I can't seem to figure out in the program how to change it. Am I having a vac leak? Is it just a cat diagnostic? Why am i getting less than 16mpg's on an n/a vehicle???

here is a link to my scandepot page. todays scans are may92010-1,2,3. thanks!

Scan Depot dot net

oh, and here are the DTC's i'm getting with this 05 pcm FYI:

[PCM] P0036 - HO2S Heater Control Circuit Bank 1 Sensor 2 (Immature)
[PCM] P0131 - HO2S Circuit Low Voltage Bank 1 Sensor 1 (Pending) (Current) (Immature)
[PCM] P0141 - HO2S Heater Performance Bank 1 Sensor 2 (Pending) (Old) (Current) (Immature)
[PCM] P0412 - Secondary Air Injection (AIR) Solenoid Relay Control Circuit Bank 1 (SES) (Pending) (Old) (History) (Current) (Immature)
[PCM] P0418 - Secondary Air Injection (AIR) Pump Relay Control Circuit Bank 1 (SES) (Pending) (Old) (History) (Current) (Immature)
[PCM] P2432 - Secondary Air Injection System Air Flow/Pressure Sensor Circuit Low (SES) (Pending) (Old) (History) (Current) (Immature)
[Unknown] B3948 - (History) (Current) (Immature)
[Unknown] B3949 - (History) (Current) (Immature)
[Restraints] U1000 - Class 2 Communication Malfunction (History) (Immature)
[Restraints] B0092 - PPS passenger detection error (History) (Immature)
[HUD] U1000 - Class 2 Communication Malfunction (History) (Current) (Immature)


Continuous Tests
Misfire: Complete
Fuel System: Complete
Comprehensive Component: Complete


Once Per Trip Tests
Catalyst: Incomplete
Heated Catalyst: n/a
Evaporative System: Incomplete
Secondary Air System: Incomplete
A/C System Refrigerant: n/a
Oxygen Sensor: Incomplete
Oxygen Sensor Heater: Incomplete
EGR System: Complete

I wouldnt worry about the 16.4 until you get that exhaust leak fixed. It might not be the problem, but I was thinking about that today. Can't really tune when leaking.

Those codes are all related to AIR/HEATER ... You did say your air does suck... hmm wonder why you didnt get that on 07 PCM.

Also HPTuners... any of you have any advice/writeup on how he can do a MAF TUNE? I have a PT, so I am no help.

actually, when i started it up this morning, i threw an ses light on the 07 pcm...i'm assuming its the cat diagnostic you were talking about

Originally Posted by vailskier3

actually, when i started it up this morning, i threw an ses light on the 07 pcm...i'm assuming its the cat diagnostic you were talking about

Here is an link about it... the only reason I know about this.. is because I experienced it.. however, don't you have a scan before the header rear o2 delete? If so, does it show 16.4 too?

http://www.grandprixforums.net/f65/r...ewer-7092.html

An HPTuner thread I found regarding MAF Tuning:
New tuner/ maf tune - HP Tuners Bulletin Board

yeah, if you look at the march scan on the scandepot site, i had that scan done before the rear 02 delete...