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Thread: Hot start issue, won't start right after turn off the engine.

  1. #1
    Member madstudios's Avatar
    Join Date:  Oct 2016

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    Hot start issue, won't start right after turn off the engine.

    Hi everyone!

    I'll describe my hot start issue:

    If I turn off the car with the engine hot, and try to turn on right after (or within a minute or 2), it won't start... and If I try to crank for a couple of times it smells like the engine is flooded. I have to wait a bit, like 5 to 10 minutes and then it fires up.

    If the car sits for more than 10 minutes, I don't have hot start issues, just very occasionally.

    I'm running open loop, dwell was set properly, no vacuum leaks, accumulator was replaced (1000 miles on it).

    Any thoughts?





    Fernando Silotto. Sao Paulo - Brazil
    Delorean Vin 3772

  2. #2
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    6,508

    My VIN:    03572

    I would bet your cold start valve is running on a hot engine start. Try unplugging the CSV and see if the problem goes away.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  3. #3
    Member madstudios's Avatar
    Join Date:  Oct 2016

    Posts:    66

    I was looking for bad connections, and I found out that a wire on my CPR connector has bad connection, only one thin wire was holding, and broke...
    Now I've disconnected the cold start valve and fired right up.


    Fernando Silotto. Sao Paulo - Brazil
    Delorean Vin 3772

  4. #4
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

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    My VIN:    03572

    The heater in the CPR would not cause your hot start problem unless it shorted. If it shorted your lambda may not get powered.

    I've found I need the cold start valve if my car sits for more than a week. I guess the injectors leak down in that time to make starting hard.

    If disconnecting the CSV fixed your hot start problem then it's time to find out why the CSV is firing on a hot engine.
    Last edited by Bitsyncmaster; 05-15-2017 at 07:33 PM.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  5. #5
    Delorean Guru
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    Verify there is NOTHING plugged into the hot start relay plug. Make sure the cold start system (the cold start valve and the TTS) are hooked up correctly and operating correctly. The cold start valve should NOT operate if the engine is warm-hot. Next time try unplugging the cold start valve before trying to start a hot motor and see if that improves things. If it does, it means the cold start valve is squirting when it shouldn't.
    David Teitelbaum

  6. #6
    Member madstudios's Avatar
    Join Date:  Oct 2016

    Posts:    66

    Quote Originally Posted by Bitsyncmaster View Post
    The heater in the CPR would not cause your hot start problem unless it shorted. If it shorted your lambda may not get powered.

    I've found I need the cold start valve if my car sits for more than a week. I guess the injectors leak down in that time to make starting hard.

    If disconnecting the CSV fixed your hot start problem then it's time to find out why the CSV is firing on a hot engine.
    After another round of tests yesterday, disconnecting the CVS didn't "fix" the problem.
    So it's something else.
    What else could I check now?



    Fernando Silotto. Sao Paulo - Brazil
    Delorean Vin 3772

  7. #7
    Member madstudios's Avatar
    Join Date:  Oct 2016

    Posts:    66

    Quote Originally Posted by David T View Post
    Verify there is NOTHING plugged into the hot start relay plug. Make sure the cold start system (the cold start valve and the TTS) are hooked up correctly and operating correctly. The cold start valve should NOT operate if the engine is warm-hot. Next time try unplugging the cold start valve before trying to start a hot motor and see if that improves things. If it does, it means the cold start valve is squirting when it shouldn't.
    Hi David!
    Nothing is plugged in the hot start relay, and after few more tests, unplugging the CSV had no improvement.


    Fernando Silotto. Sao Paulo - Brazil
    Delorean Vin 3772

  8. #8
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

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    My VIN:    03572

    Quote Originally Posted by madstudios View Post
    After another round of tests yesterday, disconnecting the CVS didn't "fix" the problem.
    So it's something else.
    What else could I check now?

    Fernando Silotto. Sao Paulo - Brazil
    Delorean Vin 3772
    Is the problem consistent and not a random thing?
    Dave M vin 03572
    http://dm-eng.weebly.com/

  9. #9
    Member madstudios's Avatar
    Join Date:  Oct 2016

    Posts:    66

    Hot start issue, won't start right after turn off the engine.

    Quote Originally Posted by Bitsyncmaster View Post
    Is the problem consistent and not a random thing?
    Consistent, it happens only with the engine hot and if I try to start right after shutting off.
    If I wait 5 minutes or more, the car starts normal.


    Fernando Silotto. Sao Paulo - Brazil
    Delorean Vin 3772
    Last edited by madstudios; 05-18-2017 at 08:50 AM.

  10. #10
    aka RacerX Ryan S.'s Avatar
    Join Date:  Jun 2011

    Location:  Sacramento, CA

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    My VIN:    2567

    O-ring?

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