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Thread: Engine Roaring and Popping from dead stop

  1. #1
    getaway6819 is offline Cadillac Owners Member
    Automobile(s): 2005 STS
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    Engine Roaring and Popping from dead stop

    I recently aquired a 1999 Deville and I have noticed that thie 4.6 has considerably more power than my 1994 4.9. The engine litterly roars when putting the accelerator to the floor. Is this normal? I cannot recall My 4.9 deville sounding this gutsy. One other thing occasionally under hard acceleration from a dead stop, not when kicking it down to pass a car, that it will occasionally have a popping sound maby two or three times while in first. Does any one have any thoughts? I checked for codes and there were none. my neighbor said he would change plugs and wires. the car has 59,987 miles on the clock now. Looking forward to hearing if someone has experienced this sort of problem. Thanks for reading
    Mike


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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
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    Re: Engine Roaring and Popping from dead stop

    The sound at WOT is normal. It is after all a high performance engine.

    While 60K is a bit premature, I agree with your neighbor. Stick with A/C Delco plugs & wires. Auto Parts Fast at RockAuto. Good prices & fast shipping.

  4. #3
    getaway6819 is offline Cadillac Owners Member
    Automobile(s): 2005 STS
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    Re: Engine Roaring and Popping from dead stop

    Ranger

    Thank you for the fast responce. Needless to say your response put my mind to ease. Plugs and wires , not a problem.
    Thanks again
    Mike

  5. #4
    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: Engine Roaring and Popping from dead stop

    Quote Originally Posted by getaway6819 View Post
    I recently aquired a 1999 Deville and I have noticed that thie 4.6 has considerably more power than my 1994 4.9. The engine litterly roars when putting the accelerator to the floor. Is this normal? I cannot recall My 4.9 deville sounding this gutsy
    Well the reason is highly scientific, but it can be simplified with the following fact:



    Northstar's rule, 4.9's drool

  6. #5
    Cadillacboy's Avatar
    Cadillacboy is offline Cadillac Owners Connoisseur
    Automobile(s): 1996 Cadillac Fleetwood Brougham
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    Re: Engine Roaring and Popping from dead stop

    My previous 96 STS had a very gutsy and overbearing roar at the idle or launch.As for my current car, it's not . It's too silent and you can hardly notice it's running.Also, when it's reaching normal operating temps , it goes silent and silent . May be what was made from 2000 and up N*s also included reduction of that noise . Even though I thought it was just some technical work in order to end up some headgasket or lousy problems .


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