Won't start when warm

Discussion in 'Propulsion' started by Economacki, Jul 13, 2005.

  1. Economacki
    Joined: Jul 2005
    Posts: 2
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    Location: Pennsylvania

    Economacki New Member

    Just found this forum, and I hope you folks may shed some light on my particular problem. I wasn't able to find a similar problem on the search function.
    So- my 140 Mercruiser will start in a second when cold. When running (well) for about 15 minutes, and shut-down, it will not restart,(no spark) until cool. I've changed-out the coil,points,condenser,rotor,dry gas. The boat was in my garage the whole of last year, due to a rainy summer in these parts (NW Pa.).
    Any thoughts?
  2. JonathanCole
    Joined: May 2005
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    Location: Hawaii

    JonathanCole imagineer

    If it is true that you have no spark in warmed up conditions, and you have replaced the items mentioned, then you should think about what heat does (cause expansion) and how and where that might interrupt the circuit to the coil, points, plug/plug wires. If a connector is corroded or broken inside of insulation, often times the heat of running can cause an open circuit due to thermal expansion. Check the continuity on all the wiring in the ignition system when it will not start. Don't forget continuity to ground. Alternatively, a starter/solenoid that draws too much current can deprive the ignition of current sort of like a lesser short circuit.
  3. tom kane
    Joined: Nov 2003
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    Location: Hamilton.New Zealand.

    tom kane Senior Member

    Perhaps your coil is getting to hot,this makes induction coils very inefficient.
  4. woodboat
    Joined: Nov 2003
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    Location: Baltimore MD, USA

    woodboat Senior Member

    Did you buy the proper coil. There are internal and external resistance coils. Which do you have? Which do you need?
  5. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    Changing parts without troubleshooting is a very expensive way to fix a problem. Also, if the cause of the problem still exists, you may damage new parts. Warm up the engine until it doesn't run and test for power with a test light. Measure coil primary and secondary resistance and check they are correct. The ballast resistor, or lack of, can also be a problem.
  6. Economacki
    Joined: Jul 2005
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    Location: Pennsylvania

    Economacki New Member

    Thanks for the replies and the suggestions offered. I've been traveling, but will use your thoughts this week & see what happens. I'll report on what I hope is a solution.
  7. Chrisstopher
    Joined: Jul 2006
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    Location: Madison WI

    Chrisstopher New Member

    No Warm Start - Any solution here ?

    I know this thread is a year old - but i have exact same problem - no start when warm. '86 3.0L Mercruiser, 4-cyl GM with carb and points. Fires instantly when COLD with 3-5 pumps on throttle.

    Once warm, have tried no gas (in idle position), 3-5 pumps, constant pump and wide open. Will always "eventually" start but i'm wearing out parts fast.

    Economiser - did you find a good solution? Any other suggestions?

    thanks much for your help. Family will not go out with me again until fixed (can't say i blame them!)

    Madison WI

  8. tdomi2
    Joined: Oct 2006
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    Location: nova scotia

    tdomi2 New Member

    sounds like a bad condenser.
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