Bringing TBI and Multi Port Fuel Injection to a New Level.     EFI Conversions and Tuning! Seattle to Portland! E-mail Tuning Consultant!
Results 1 to 7 of 7

Thread: Returnee to the Forum with basic question

  1. #1
    Fuel Injected!
    Join Date
    Jan 2013
    Age
    70
    Posts
    69

    Returnee to the Forum with basic question

    I am considering a switch to a 16168625 PCM from a my ECM 16144288 with BCC BARL but would like to get things running smoothly before making the switch.

    In order to ease installation, I added a 6" wire patch in the O2 sensor wire between the sensor and ECM. I am now experiencing engine problems, Code 45--Rich Exhaust once the ECM switches from OPEN to CLOSED loop. I am wondering if this extension is messing up the sensor readings to the ECM.

    Thank you in advance.

  2. #2

  3. #3
    Fuel Injected!
    Join Date
    Jan 2013
    Age
    70
    Posts
    69
    Steveo,

    If I recall correctly, I used butt connectors for the spliced in portion. Also, in order to not create a bulge in one location, I staggered where I put each connector.

    In retrospect, I am thinking I should redo the splice and solder rather than use butt connectors, then individually shrink-wrapping each wire. Hopefully, this redo will cure the Code 45 problem.

    Any additional thoughts?

  4. #4
    Fuel Injected! steveo's Avatar
    Join Date
    Aug 2013
    Posts
    2,224
    In retrospect, I am thinking I should redo the splice and solder rather than use butt connectors, then individually shrink-wrapping each wire. Hopefully, this redo will cure the Code 45 problem.
    "An oxygen supply inside the HO2S is necessary for proper HO2S operation. This supply of oxygen is supplied through the HO2S wires. All HO2S wires and connections should be inspected for breaks or contamination that could prevent reference oxygen from reaching the HO2S."

    - GM service manual for DTC45

    o2 sensors measure the difference between reference oxygen and exhaust oxygen. basically don't cut that o2 wire open or you risk screwing up your o2 readings.

  5. #5
    Fuel Injected!
    Join Date
    Jan 2013
    Age
    70
    Posts
    69
    Steveo, thanks for your responses.

    Now, I am a bit perplexed. Based on this information, once the harness is manufactured, installed in a vehicle, and connected to an ECM, any damage/breaks/contamination to the original wires between the O2 sensor and the ECM will be detrimental. I find that hard to believe and, more so, that there is no remedy or way to address this.

    To clarify, I have not cut or damaged the wires between the newly installed O2 sensor and the male plug. My splice was made between the female plug and the ECM. Time for me to do some spark-chasing with a VOM.

    Thanks.

  6. #6
    Fuel Injected!
    Join Date
    Jan 2013
    Age
    70
    Posts
    69
    Steveo, just to make sure my patch was making good connection, I removed the butt connectors, soldered the wires, and shrink-wrapped each wire individually. Lastly, I did a big shrink-wrap of the area to seal it off.

    Thanks for your assistance.
    Last edited by 57 Handyman; 06-26-2017 at 10:07 PM. Reason: spelling

  7. #7
    Fuel Injected!
    Join Date
    Jan 2013
    Age
    70
    Posts
    69
    Steveo

    Unfortunately, I am still experiencing issues with my motor not running smoothly.

    About a week or so ago, I decided to head in a different direction which was to simply install an adapter which I had made for a ECM-to-PCM swap. My goal is to ultimately install an 8625 PCM in place of the current 4288 ECM. This saga is captured in another thread titled "Doing ECM to PCM Swap" which I started to seek assistance in troubleshooting what appears to be a no-prime and fuel pump issue. The perplexing part is with the 4288 installed there is no problem with fuel prime and other fuel pump functions--only the struggle to continue running after the ECM switched from Closed to Open loop. However, upon installing an adapter which I have fashioned to bridge the 4288 ECM harness connector to 8625 PCM, the motor will only start if starter fluid sprayed or fuel is poured into the TBI but not will not continue to run due to there being no fuel being pumped to the TBI.

    Sure could use yours, Dave W's, or anyone else's expertise in solving this issue and allow me to get me on my way goal of tuning my resto-modified S10.

    Thank you in advance!
    Last edited by 57 Handyman; 07-02-2017 at 07:09 PM.

Similar Threads

  1. Basic Steps to Tuning?
    By 90Vette in forum TunerPro Tuning Talk
    Replies: 3
    Last Post: 01-02-2017, 09:20 AM
  2. HI I Im new to this forum. LT1 question.
    By grvlt1 in forum Introductions
    Replies: 3
    Last Post: 11-29-2016, 03:34 PM
  3. new to forum
    By ldcombs in forum Introductions
    Replies: 2
    Last Post: 10-15-2016, 02:50 PM
  4. New to Forum
    By Grant73Ford in forum Introductions
    Replies: 1
    Last Post: 09-15-2014, 08:11 PM
  5. New to the forum, knock sensor question
    By bp71k5 in forum Introductions
    Replies: 6
    Last Post: 03-23-2014, 06:51 PM

Bookmarks

Posting Permissions

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