1993 Deville 4.9 Detonation - Page 2

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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 1993 Deville 4.9 Detonation in Past Cadillac Vehicle Discussion; I don't think those distributors have any advance, it's all done by the computer. But if the timing is off ...
  1. #16
    brougham is offline Cadillac Owners Master
    Automobile(s): 1991 Cadillac Brougham D'Elegance 5.7 Litre, 1994 DeVille
    Join Date
    Jun 2003

    Re: 1993 Deville 4.9 Detonation

    I don't think those distributors have any advance, it's all done by the computer. But if the timing is off that would also cause it.

  2. #17
    cadillac_al is offline Cadillac Owners Connoisseur
    Automobile(s): 70 Deville 77 Fleet 78 Seville 92 Deville 03 Deville
    Join Date
    Feb 2007

    Re: 1993 Deville 4.9 Detonation

    Oh yeah, no vacuum advance for sure. I can't remember about mechanical advance, maybe it doesn't have one after all. If the computer controls it all, then maybe the computer is the problem. FWIW My 92 would never ping so I only had the dist cap off once, only to replace the original. Maybe you should get a second opinion on your pinging. I'm wondering if it could be a leaking plug wire snapping, or crossed plug wires, or an exhaust leak or belt squeal or something totally unrelated. Good luck.

  3. #18
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
    Automobile(s): 2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
    Join Date
    Sep 2010
    East Boston MA.
    Any engine with a mechanical ignition system (distributor) has to have mechanical advance, weather it's computer controlled or not. It can't be done purely by electronics, something has to physically change the position of the distributor cap contacts in relation to the rotor.

  4. #19
    Jonathan11 is offline Cadillac Owners Member
    Automobile(s): 1993 Cadillac Coupe Deviile
    Join Date
    Jul 2013
    Thread Starter

    Re: 1993 Deville 4.9 Detonation

    I checked the timing but you're saying even if the timing is good, there could be a malfunction with the timing advancing?

  5. #20
    dennis93coupe's Avatar
    dennis93coupe is offline Cadillac Owners Connoisseur
    Automobile(s): 1993 Coupe Deville, 2009 XLR-V 1 of 6 Crystal Red
    Join Date
    Feb 2010
    Orange County, CA

    Re: 1993 Deville 4.9 Detonation

    Been a long time but don't remember seeing anything mechanical inside under the rotor or anywhere else. I'm wondering what that harness inside the distributor looks like.

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