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Thread: 18 5.0L Hot start stall

  1. #1
    Advanced Tuner 4wheelinls1's Avatar
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    18 5.0L Hot start stall

    I have an issue with a hot start stall in an 18 car. It has a PD supercharger, if you breathe on the throttle it continues to run, I've tried all sorts but to no avail. I see the odd random Mustang forum with this issue, any fixes?
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  3. #3
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    Have you added a little idle air?

  4. #4
    Advanced Tuner 4wheelinls1's Avatar
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    Tune attached, I have added idle air but will try more. The vehicle is PD supercharged, the file is my own build for a Harrop 2650 based on the stock OS. The car has good readability and power, hot start is the only issue.
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  5. #5
    Advanced Tuner 4wheelinls1's Avatar
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    Quote Originally Posted by MRRPMBRP View Post
    Have you added a little idle air?
    Added more but made no difference, I notice the throttle source is 16 when it stalls on hot start but switches to 9 when you touch the throttle and it runs.

  6. #6
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    Just looked at your log, throttle is open, timing is there, air is flowing, A/F is ok, I'd be looking for an air leak (vacuum)

  7. #7
    Advanced Tuner 4wheelinls1's Avatar
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    Quote Originally Posted by MRRPMBRP View Post
    Just looked at your log, throttle is open, timing is there, air is flowing, A/F is ok, I'd be looking for an air leak (vacuum)
    Glad we are seeing the same thing from that respect. Whats the logic behind an air leak relative to hot start only?

  8. #8
    Senior Tuner veeefour's Avatar
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    Anything done to the fuel system?

    Try to play with cranking spark, -10 might be way too retarded for power adder.

    Cranking spark.jpg
    Last edited by veeefour; 08-14-2019 at 12:33 AM.

  9. #9
    Advanced Tuner 4wheelinls1's Avatar
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    Quote Originally Posted by veeefour View Post
    Anything done to the fuel system?

    Try to play with cranking spark, -10 might be way too retarded for power adder.

    Cranking spark.jpg
    It starts and runs for 2 seconds, you can see timing adding, +15-20 degrees, I did try adding 5 degrees with no change. There isn't a lot of emissions retard on a hot start.

  10. #10
    Advanced Tuner 4wheelinls1's Avatar
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    Quote Originally Posted by 4wheelinls1 View Post
    It starts and runs for 2 seconds, you can see timing adding, +15-20 degrees, I did try adding 5 degrees with no change. There isn't a lot of emissions retard on a hot start.
    Crank spark.jpg

    The spark has well and truly recovered at good rpm prior to the stalling,

  11. #11
    Advanced Tuner 4wheelinls1's Avatar
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    Quote Originally Posted by 4wheelinls1 View Post
    It starts and runs for 2 seconds, you can see timing adding, +15-20 degrees, I did try adding 5 degrees with no change. There isn't a lot of emissions retard on a hot start.
    Crank spark.jpg

    The spark has well and truly recovered at good rpm prior to the stalling,

  12. #12
    Advanced Tuner 4wheelinls1's Avatar
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    This is a different car with the same mods, and tune, it is less pronounced but will stall on hot start if left for 2-4 minutes on the first attempt but will start the second attempt. I'd bee keen to know if anyone can see anything in the log that look different.
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  13. #13
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    Did you ever figure this out? Having the same issue on a harrop 2650 on a 2016 GT, After its hot car refuses to start

  14. #14
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    In Spark Advance, you can adjust your cranking spark along with CSER spark to advance timing a little more. IATS are 150* causing 7* to be taken away just from the heat soak.

    You can try adjusting your Feedforward Control in the ETC tab if throttle body size increased significantly.