500 75 deville hot start
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  • 1 Post By drmenard
500, 472, 425, 368 Discussion, 500 75 deville hot start in Cadillac Engine Technical Discussion; I'm having an issue with my 1975 deville. When I drive it in the Texas summer heat, it makes a ...
  1. #1
    shwhitley's Avatar
    shwhitley is offline Cadillac Owners Member
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    500 75 deville hot start

    I'm having an issue with my 1975 deville. When I drive it in the Texas summer heat, it makes a clattering noise accelerating from a stop. When I try to crank it after its only sat for a few minutes, it's difficult to start. I have to press the accelerator a lot to get it to start. AnIthithinkmusitmust be so

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    I think it might be in the carb but one mechanic said it could be timing chain needing to be replaced. After the engine has cooled it starts right up. Tried higher octane fuel that helped some but not completely.

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  3. #2
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: 500 75 deville hot start

    It sounds to me like the timing is advanced too much.

  4. #3
    shwhitley's Avatar
    shwhitley is offline Cadillac Owners Member
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    Re: 500 75 deville hot start

    thanks! I will have them check that

  5. #4
    drmenard is online now Cadillac Owners Enthusiast
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    Re: 500 75 deville hot start

    The first thing that I would check is the weights in the distributor for the advance. If they get stuck it can keep your timing advanced..
    The Ape Man likes this.

  6. #5
    BRUCE ROE is offline Cadillac Owners Fanatic
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    Re: 500 75 deville hot start

    At the same time, check the condition of the timing chain. Any car of that vintage should have an all steel
    replacement in place. The originals used plastic teeth which in time fall off the cam sprocket. Bruce Roe

  7. #6
    shwhitley's Avatar
    shwhitley is offline Cadillac Owners Member
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    Re: 500 75 deville hot start

    I was wondering about the timing chain...it only has 46K miles on it but I was thinking since it didn't have many miles, the timing chain should be good...but if it's plastic, and it's been sitting for a long time, then that makes sense

  8. #7
    shwhitley's Avatar
    shwhitley is offline Cadillac Owners Member
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    So I had the timing adjusted and also had tune up with new points plugs distributor and coil. Still resists starting hot. It also hesitates when I accelerate from a standing stop.

  9. #8
    The Ape Man's Avatar
    The Ape Man is offline Cadillac Owners Connoisseur
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    Re: 500 75 deville hot start

    The mechanical advance weights on these engines always wind up binding.

    This advances timing. Resetting timing without repairing the problem is useless and will yield dismal fuel economy.

  10. #9
    shwhitley's Avatar
    shwhitley is offline Cadillac Owners Member
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    Re: 500 75 deville hot start

    What sort of fuel economy should I be getting? i'm getting 10 mpg now...figured that was about the best I could expect. I will have them check these weights. I had thought about replacing the carburetor with a new one for the 76 model as I'd heard that carb was better than the 75. I'd rather not have to do that though. When the car cools down, it usually starts right up. Starts easily in the morning too just hesitates sometimes when you start off and it's cold

  11. #10
    The Ape Man's Avatar
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    Re: 500 75 deville hot start

    Economy depends a lot of your style of driving. 10 is dismal even for this car.

  12. #11
    deVille33 is offline Cadillac Owners Connoisseur
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    Re: 500 75 deville hot start

    Check your vacuum lines and the dashpots. Make sure the dashpots hold vacuum for the required length of time. Check the hoses for burn through where they set on the engine and the connections for dried rubber and cracks. Check the distributor advance dashpot. See how sensitive it is to vacuum signal. If it fails to hold vacuum, it may have a small crack in the diaphragm and not responding to signal well.

  13. #12
    chrisntam is offline Cadillac Owners Member
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    Re: 500 75 deville hot start

    When you say it difficult to start when hot, does the engine crank over like it does when it's cold or does the starter have a difficult time turning the engine over? What about the starter getting hot and not being able to perform as it should and not being able to turn the engine? What kind of shape is the battery in? Of course the starter/battery prolly won't be an issue if the engine spins at the same speed when hot as when cold............Be sure to keep us informed as to your progress.

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