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Thread: Cold Start Valve

  1. #1
    Senior Member Silverbullet's Avatar
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    Cold Start Valve

    Is there an easy test to see if it is working or not? Last few times I try to start the car when cold it cranks, but does not fire.. takes like 3 times cranking before it wants to fire...
    Starts fine warm/hot.
    Craig

  2. #2
    Senior Member
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    Quote Originally Posted by Silverbullet View Post
    Is there an easy test to see if it is working or not? Last few times I try to start the car when cold it cranks, but does not fire.. takes like 3 times cranking before it wants to fire...
    Starts fine warm/hot.
    Craig
    A quick and "dirty" way is to take it off the pipe, stick it into a cup and crank the motor. It should squirt while cranking for a few seconds.
    David Teitelbaum

  3. #3
    Senior Member Silverbullet's Avatar
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    Quote Originally Posted by David T View Post
    A quick and "dirty" way is to take it off the pipe, stick it into a cup and crank the motor. It should squirt while cranking for a few seconds.
    Cool, my guess is I have to do it while the engine is really cold, first thing in the morning?

    Thanks,
    Craig

  4. #4
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    Quote Originally Posted by Silverbullet View Post
    Cool, my guess is I have to do it while the engine is really cold, first thing in the morning?

    Thanks,
    Craig
    Yes.
    David Teitelbaum

  5. #5
    DMC Midwest - 815.459.6439 DMCMW Dave's Avatar
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    It's NEVER the valve. Look for something electrical, even if it doesn't seem to work.
    Dave S
    DMC Midwest - retired but helping
    Greenville SC

  6. #6
    Senior Member Rich's Avatar
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    Per Dave's note, look upstream of the CSV.
    Quote Originally Posted by Silverbullet View Post
    Cool, my guess is I have to do it while the engine is really cold, first thing in the morning?
    Sure, do that. The CSV should actuate any time you crank with coolant temp below 95degF AND not having cranked engine very much in the previous 10min.

    See last page of Engine-Will-Not-Start troubleshooting chart in the "thin" factory manual, 4th image of this set - click a second time after it opens to sharpen the text:

    LINK: http://dmctalk.org/showthread.php?3142-Factory-Troubleshooting-Charts-Engine-Will-Not-Start

    So first be sure the CSV's getting a voltage signal during a cold crank.
    March '81, 5-speed, black interior

  7. #7
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    Most of the time the problem is the TTS (Thermo Time Switch). Either it's bad, not properly grounded, or the plug is forced on wrong. Another problem can be if the starter was touched and the wires were not put back correctly. It is a VERY simple circuit. Refer to D:01:10
    David Teitelbaum

  8. #8
    DMC Midwest - 815.459.6439 DMCMW Dave's Avatar
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    BTW if the outer shell of the TTS gets broken, allowing the plug to be plugged in backwards, the TTS will be electrically destroyed the first time you turn the key.
    Dave S
    DMC Midwest - retired but helping
    Greenville SC

  9. #9
    Senior Member Silverbullet's Avatar
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    Ok, I checked the CSV and the engine was cold, no gas is being delivered... So I will have to check the electric. I have not done anything with the starter wires of TTC...

    Ok, should I get 12 volts across the 2 pins going to the CSV when I crank?

    Craig
    Last edited by Silverbullet; 02-08-2014 at 06:27 PM.

  10. #10
    Senior Member Silverbullet's Avatar
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    Ok, this is what I found out...

    When I swapped the Gray plug to the CSV, put it in a cup, and started it up, I got gas...

    So when it is cold, I should get 12 volts to the Blue plug when I crank, right?

    So when cold should the thermmal sensor be open or closed?

    Craig

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