Olds 307 Trouble

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5.0 and 5.7 Discussion, Olds 307 Trouble in Cadillac Engine Discussion; I bought an 84 Delta 88 with a 307 a few months ago so I could give my Caddy a ...
  1. #1
    MaineWater's Avatar
    MaineWater is offline Cadillac Owners Fanatic
    Automobile(s): 1984 Coupe Deville, 1991 Brougham d'elegance, 1996 Deville
    Join Date
    Mar 2007

    Olds 307 Trouble

    I bought an 84 Delta 88 with a 307 a few months ago so I could give my Caddy a break and was wondering if anyone could point me in a direction. It was fine until a long trip. First when it is cold it will conk when I put it in reverse after start up. Secondly If I push hard it will make a huge popping sound,ithas to be from the carb. The engine seems to run fine in idle butunder pressure it seems to struggle. All vaccuum lines seem fine except the top one in back, but that one seems like it has no effect when removed. Any ideas?

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  3. #2
    cadillac_al is offline Cadillac Owners Connoisseur
    Automobile(s): Cadillac 78 Seville, 78 Coupe de Ville, 92 Sedan de Ville
    Join Date
    Feb 2007

    Re: Olds 307 Trouble

    Popping through the carb could be a bad cam or burnt/bent valve. The only 307 I ever had burned a valve. A compression test and vacuum test will verify and/or rule out those obvious things. Those transmissions aren't exactly bulletproof either. Do you suppose that car had a few hot driving before it was sold?

  4. #3
    generaltso64's Avatar
    generaltso64 is offline Cadillac Owners Member
    Automobile(s): 88 brougham
    Join Date
    Jun 2010

    Re: Olds 307 Trouble

    timing? bad plug wires?

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