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Thread: Flashing MIL after 24x conversion

  1. #1
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    Default Flashing MIL after 24x conversion

    I did the 24x conversion on my 99 5.7 Vortec over the last few days and about a minute into driving I get a flashing MIL. Doesn't feel like it missing and all gauges are ok. I started with a stock 01 Silverado 5.3 tune and changes all fuel, airflow and spark tables to my old 5.7 tune. I left the dwell table alone though.

    Any ideas? I was logging when it happened if that helps.

  2. #2
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    I can post the tune and log file when I get home.

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  4. #4
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    Do I have an improper catalytic converter setting?

  5. #5
    Joe (Moderator) joecar's Avatar
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    Did you do a CASE relearn...?

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    No I did not. When I did my original 5.7 swap I had a MIL telling me to do one. No MIL this time. But still required? Is that causing me to misfire?

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    Do I need a relearn even if I'm not getting p1336?

  8. #8
    Joe (Moderator) joecar's Avatar
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    Yes, PCM now sees a different crank rotating assembly and different CKP sensor...

    during CASE relearn the PCM learns the rate of deceleration during misfire... this is what it then uses to detect misfires.

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    Fair enough. Now if only I could get the relearn to happen. I have c1 32 and 34 grounded. TCC has 12v without brake and 0 with brakes.

    I am however getting a p0706 'transmission range switch performance' even though I have a manual segment swap. Why would this be? I was getting it before I grounded 32 and 34 also.

    The p0706 does not produce a MIL. It only shows on scan tool

  10. #10
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    Also gm.tstate00 pid says 'no' for in p/n while monitoring. is the pcm seeing this and not letting CASE work?

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