Engine won't start when warmed up
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Engine won't start when warmed up

  1. #1
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    Default Engine won't start when warmed up

    This has been getting worse for approx' one month; Starts just fine when cold....Then, after warming up fully, it starts having problems...Turns over just fine(Plenty of battery power) but it won't light......Takes a few times to get it to go finally...Until yesterday; It refused to start.....Even tried putting in neutral and opening the throttle all the way....Nothing!


    This morning it was cold, sitting in the garage and it started right up...



    Checked the cap/rotor- Shiny, no wear....the carb does not appear to have any problems.


    The engine; 460 Ford 9:1 with tight quench, mild cam 219/224 at 113*, Stealth dual-plane, Edelbrock 750 Marine carb, Mallory distributor. Could it be the (Possibly original) Coil is going bad? I may have had a similar problem years ago and believe I sort of fixed it by replacing the external Russel fuel filter element.....Although I apparently am losing what little memory ability I have....

    Any suggestions would be appreciated......

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  3. #2
    DEG
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    Spark when warm?



    Sent from my iPhone using Tapatalk

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    I probably should have tested that when it was hot...But on Grant line canal, the water was flowing at approx 3-5 mph, so I was trying to keep her from ramming the shore, then gettin' a tow...and then getting her on the trailer...And then I simply didn't think of it....I think I'll swap out the coil...A friend may have a spare....

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    I've experienced that once, ended up being too much or too little timing...

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    Thanks for the suggestion- but, I have been running this with the timing set the same for quite a few years and haven't changed anything...That being said, I will check the timing......I tend to attract the kind of problems that aren't.....normal.....

  8. #6
    Senior Member wolfie's Avatar
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    Check your coil.. Had that problem with an old car I had.. Once it warmed up, the coil didn't give off enough voltage/amperage.

  9. #7
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    mechanical or electric fuel pump? closed engine compartment or open?
    Last edited by ol guy; 08-09-2017 at 01:35 PM. Reason: add on

  10. #8
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    Mechanical fuel pump, and closed engine compartment...I actually have an Earl's metal matrix fuel filter just before the carb, plus a paper element one before the pump....I am working to replace the element in the Earl's and the whole paper filter...And have a new (US made) Crane Cams coil inbound...should be here in a week.

    Kind of odd because the engine starts right up when cold- Bang!...But it starts having trouble when warmed up and I just would have run the battery down if I'd kept trying last Sunday.

    I am very careful about dependability; I always kick it until it lights in the garage the day before I drive out to the Delta....It's a one hour drive and one of my biggest pet-peeves is a guy backed down the MIDDLE of a TWO lane launch ramp...then can't start the boat and sits there taking it apart while others line up waiting to launch...Arrrrrrrggghhhhhhhh.....!
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  11. #9
    Senior Member ol guy's Avatar
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    Quote Originally Posted by cvxjet View Post
    Mechanical fuel pump, and closed engine compartment...I actually have an Earl's metal matrix fuel filter just before the carb, plus a paper element one before the pump....I am working to replace the element in the Earl's and the whole paper filter...And have a new (US made) Crane Cams coil inbound...should be here in a week.

    Kind of odd because the engine starts right up when cold- Bang!...But it starts having trouble when warmed up and I just would have run the battery down if I'd kept trying last Sunday.

    I am very careful about dependability; I always kick it until it lights in the garage the day before I drive out to the Delta....It's a one hour drive and one of my biggest pet-peeves is a guy backed down the MIDDLE of a TWO lane launch ramp...then can't start the boat and sits there taking it apart while others line up waiting to launch...Arrrrrrrggghhhhhhhh.....!
    I am Glad you got back. Reason for that is if you have a coil on the way okay. First I would take the boat out and warm it up to were you have problems then shut it off, sit a few minutes and try to restart. If it gives you trouble open the hatch and try to pump the throttle to see if it is shooting fuel into the manifold. Reason being is to try to find out if the fuel system is not vented well enough and the tanks are sucking fuel back to the tanks instead of letting the fuel stay in the carb. second would be if the carb is boiling off the fuel in the carb. If the squirters are not fueling the manifold I would try I more thing, go for a run and shut down when you know it will give you a hard time starting, right after shutdown open the fuel fills wait a bit and try to start. Now if none of this answers the question then replace the coil and go for a run long enough for the problem to arise, shut down long enough for it to act up. If it does not fire take a test lead and jump across the ballast resister and try to fire. Let me know "along with the rest fallowing along" Mark

  12. #10
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    Specify what type of ignition system do you have ,points or electronic.Coil is a suspect as stated previously,also there is a pickup coil in the dist if electronic.
    If you do not find anything for sure next time it does it have a little gas in a safe container or starter spray and see if it wants to start like that.That way at least you now if your looking for a fuel or ign. problem.
    Last edited by bville; 08-11-2017 at 01:21 PM.

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    OK.....I replaced the paper/plastic filter and hose before the Mech pump and the metal Earl's filter between the pump and the carb.....Obviously the new hose and filter were...empty...so I expected to turn it over quite a few times before it lit....Turned the key and after 2 seconds BAM! started right up....Figured it was the left-over fuel in the carb....Nope! It kept running for approx' 20 seconds till I shut it off......2 hours later, it started right up again....Back at the river today, with it fully warmed up it was a little hesitant, but still started up at Skye's beach.....I get the new USA made Crane coil next week but am going up to Oregon next weekend to A) See the eclipse and B) See the Gold dredge in Sumpter....(Trinity lake/County(Where I have been boat camping for 52 years) was a big gold dredge area...If you look at the north end of the lake with the water low, you will see the dredge tailings (All of the dredges in Trinity were broke up and shipped to south America)...

    Here's a pic of Skye's beach on Grant Line Canal......The "Sprinkler water" is coming off of Skye's tail....
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    Last edited by cvxjet; 08-13-2017 at 01:28 PM.

  14. #12
    kenny nunez
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    Default No hot start

    One thing that was not mentioned was the "BY PASS" circuit. You need at least 12 volts when cranking to the coil. There should be an extra post on the boost solenoid marked R or I which has voltage when in cranking mode that goes directly to the + side of the coil. If your solenoid only has 3 studs then you need one with a grounded base, basically an automotive style but for marine use.
    The problem you describe is almost always a symptom of no "BY PASS" circuit.
    In my 35 years as a repair shop owner I ran into this quite often.

  15. #13
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    I actually at one point thought about that starter solenoid bypass circuit....But then I fer-got....Thanks for reminding me....The starter works well, but that starter solenoid could be the problem....When I get a chance I will check it out!

    A bit of a funny story; When I first bought this boat I took a friend and her 3 kids up to Trinity Lake for a week...Had a pretty good time, but for some reason, the boat wouldn't start- intermittently.....I found I had to pop the hood and short across the Solenoid to get it to kick sometimes.....A month later I am checking out different areas of the boat and happened to look at the back side of the throttle.....Hmmmm....Micro-switch...hmmmm.......OH! Neutral safety switch!

    YES! I am fully qualified as a rocket scientist...(At least a GOVERNMENT rocket scientist....)

  16. #14
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    Back from the eclipse in Oregon......Was stuck in a 3 mile back-up outside the town of John Day.....Fun!

    Anyway, I swapped out the coil which seemed to fix it....but this Saturday it almost didn't start when I was going to drive it on the trailer....Started thinking about it....again....went out and tried to start it while the engine was still warm in the garage...Would not start, so I goosed the throttle once and it started right up....possibly it is not getting enough gas when warmed up at idle....The carb may need cleaning.....

    Pic of the Totality....and the Sumpter Gold dredge....
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