Results 1 to 9 of 9

Thread: Idle Air control and 02 Heater performance

  1. #1
    Junior Member
    Join Date
    Jun 2018
    Posts
    31

    Default Idle Air control and 02 Heater performance

    I have just finished a LS Swap into a 2000 BMW 323C1. It is a 2005 LM7 with a 2002 LS! computer intake and accessories. It is a manual. I removed all of the emissions stuff, set the Cylinder volume to a 5.3 from 5.7 and removed VATS. It starts and runs great however I keep getting the codes below. Idle is good What do I need to do to address these? Any concern? Any help is appreciated!!

    P0135 O2S Heater Performance Bank 1 Sensor 1
    P0155 O2S Heater Performance Bank 2 Sensor 1
    P0507 IAC RPM Too High

  2. #2
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003
    Posts
    28,403

    Default

    Are you running front O2 sensors...?
    How is the O2 heater circuit wired...?

  3. #3
    Lifetime Member THEFERMANATOR's Avatar
    Join Date
    Mar 2009
    Posts
    800

    Default

    I would start by swapping in a 02 LM7 engine segment. There's alot more changes than just VE and cylinder volume between an LS1 and LM7. Then I would be checking your wiring for your O2 heaters. The IAC code is probably due to incorrect IAC surface area settings
    1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
    DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

  4. #4
    Junior Member
    Join Date
    Jun 2018
    Posts
    31

    Default

    Joecar, I deleted the rear O2 sensors and left the front o2's wired as they were. I had so many parts from different cars I don't know what o2's went back in. I did replace one of the o2 connectors with a separate one. My next step there is to verify 12v+ at the o2's. Are all 4 wire 02's created equal? From 99 to 05 LSx and LM7?

    Thefermanator, This is where I don't know what I don't know. How do I go about swaping segments? I will search but if yo u have a quick link I'll take it. I am new to this and just happy I have the car running as good as it does and I was able to remove all of the emissions stuff!!! I want to learn how to tune but just cant quite follow the autove doc.

  5. #5
    Junior Member
    Join Date
    Jun 2018
    Posts
    31

    Default

    I tried to do a segment swap today with no success. Just to recap I have a 5.3 LM7 stock engine with a complete 2001 Trans am F body intake, injectors, knock sensors, MAF etc. I have this mated to a Nissan manual transmission. As of right now I am running a complete LS1 2001 manual tune I downloaded from the Dropbox location I found on this forum. The car runs good and I have ordered a wideband 02 to start tuning however I figured swapping in a LM7 engine calibration would help it run better.

    OK here is what I tried. I loaded up the tune I am using and then an automatic LM7 tune with the same OS ID as the alternate. I did a complete engine calibration segment swap and then went back and replaced all of the injector and MAF tables from the LS1. I also disabled the traction control. After flashing this to the ECU the car starts and idles but wont rev past 1500. Any ideas? Am I going down the right path or should I just use the LS1 base tune and do an autove once I get my Wideband 02?

  6. #6
    Lifetime Member
    Join Date
    Mar 2006
    Posts
    4,935

    Default

    You need to pick what O2s to run, and use the engine segment from the matching vehicle. The LM7 I don't think was mated to the 5spd, but there are 5spd 4.8L Silverado out there.
    You're going to need a WBO2 ASAP regardless.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  7. #7
    Junior Member
    Join Date
    Jun 2018
    Posts
    31

    Default

    got my wide band 02 installed and went through the autove process today. Need to spend more time hitting the cells and playing around but I think I have the basics down.
    Stock 5.3 VE
    Click image for larger version. 

Name:	stock-5.3-ve-table.JPG 
Views:	240 
Size:	51.3 KB 
ID:	23012
    My tune
    Click image for larger version. 

Name:	my-first-tune-ve-table.JPG 
Views:	214 
Size:	58.9 KB 
ID:	23011

  8. #8
    Lifetime Member
    Join Date
    Mar 2006
    Posts
    4,935

    Default

    You need to make sure to smooth out any spikes, I would knock that massive random spike down as it's not accurate. Use ~50-100 cell hits before you start using your log data and make sure you have followed the AutoVET procedure.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  9. #9
    Junior Member
    Join Date
    Jun 2018
    Posts
    31

    Default

    Thanks for the feedback. This was my very first run and I assumed I needed to get a higher cell hit count to be more accurate. This was derived forma 45 min drive my lowest hits were around 30 and high hits were in the 1000's. As I am sure you know the High RPM mid pressures are hard to hit. The neat part is when I look at the 5.3 chart vs the 5.7 chart and then compare to my tune my tune seems to mimic the 5.7 chart only less air intake overall. I believe this is the case since I have the LS! intake on the 5.3 motor.

Similar Threads

  1. O2 heater control
    By ProperTuningOG in forum CAX Files
    Replies: 7
    Last Post: February 18th, 2015, 07:10 AM
  2. E40 Throttle Cracker/Follower Air control
    By quik95lt1 in forum Gen IV V8 Specific
    Replies: 0
    Last Post: August 2nd, 2012, 04:15 AM
  3. Idle Air Control Removal
    By minytrker in forum General (Petrol, Gas, Ethanol)
    Replies: 0
    Last Post: February 20th, 2010, 02:33 PM
  4. Replies: 0
    Last Post: March 13th, 2006, 06:42 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •