1969 Deville - Exhaust whistle sound - acceleration
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, 1969 Deville - Exhaust whistle sound - acceleration in Past Cadillac Vehicle Discussion; Under heavier acceleration and when the engine is working harder to climb up a hill, I get a high-pitched whistle ...
  1. #1
    69Chateau is offline Cadillac Owners Member
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    1969 Deville - Exhaust whistle sound - acceleration

    Under heavier acceleration and when the engine is working harder to climb up a hill, I get a high-pitched whistle sound out the tailpipe. I can also recreate it by just revving the engine with the car in Park as well.

    I'm suspecting muffler or resonator? Anyone experience this or confirm or deny my suspicions?

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  3. #2
    jcolliga40 is offline Cadillac Owners Fanatic
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    Re: 1969 Deville - Exhaust whistle sound - acceleration

    Dude that's your Turbo you didn't know. LOL

  4. #3
    outsider is offline Cadillac Owners Connoisseur
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    Re: 1969 Deville - Exhaust whistle sound - acceleration

    Yeah turbo! the whistle goes WOO WOO

    it sounds to me like something is restricting the exhaust just enough to cause the whistle sound.

  5. #4
    69Chateau is offline Cadillac Owners Member
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    Re: 1969 Deville - Exhaust whistle sound - acceleration

    I'm sure people pay good money for the turbo whistle sound, just not me.... And not on a '69 472!

    If you think its some kind of restriction, could replacing the muffler and resonator be my best bet? Come to think of it, perhaps its a good opportunity to add a new exhaust system that's quiet during highway operation, but still provides an authoritative sound during acceleration to remind you (mainly others) there's a 472 under the hood!

    Uh-oh! I'm starting to sound like the 1969 Cadillac ad campaign! "See your Cadillac dealer and experience a Command Performance Drive."

  6. #5
    isotop14 is offline Cadillac Owners Member
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    Re: 1969 Deville - Exhaust whistle sound - acceleration

    I will go crazy!!!
    I have the same problem,,, on my 1969 Deville Coupe 472!!!

    I have installed a new carburator, new water pump,,,
    I have removed the header riser, removed the exhaust system...

    In my opinion it its a problem with the output valves in the cylinder heads (the valves dont open enough)
    because I have removed or renewed all other part outside the bigblock


    Stefan from Berlin Germany

  7. #6
    69Chateau is offline Cadillac Owners Member
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    Re: 1969 Deville - Exhaust whistle sound - acceleration

    Exhaust valve leak... Never thought of that. I hope that's not what it is!!

  8. #7
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: 1969 Deville - Exhaust whistle sound - acceleration

    If the exhaust is free flowing then it is probably a burned out/eroded valve. It could also not be seating completely from too much carbon deposits. Now that I think of it, I have seen valves stick after a car has sat for a long time. Those sticky valves will come out of it eventually. A little snake oil might help it along as much as I hate to admit it. I think those sticky valve potions are just kerosene anyway.

  9. #8
    Fleetwood70 is offline Cadillac Owners Fanatic
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    Re: 1969 Deville - Exhaust whistle sound - acceleration

    Check to see if the baffle in the secondary side of carb is present. When I forgot to put mine back in the carb after rebuild, when revving it made whistling sound when secondaries were opening.

  10. #9
    tqwrench is offline Cadillac Owners Member
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    Re: 1969 Deville - Exhaust whistle sound - acceleration

    All kidding aside, there are exhaust whistlers for sale out there, we put one in a co-workers truck and it drove him nuts for a week before it finally fell out. Make sure you don't have any pranksters running around with mischief on their minds.

    Aside from that, the baffle is a possibility on the carb. I had a 70 Fleetwood and remember that being there during a rebuild. It's primary purpose is improved tip in feel on heavy acceleration.

    Other possibilites among restrictions are the double-wall exhaust pipes that were used at one point, I'm not sure which manufacturer came up with that bright idea, but the inner wall could deteriorate and start to collapse on itself. I think that's fairly rare. Another co-worker of mine had to work on a '70 that wouldn't make any power. He took it out and held it flat to the floor down the road till he heard a loud bang and the car took off like a demon. A family of rodents camped out in the muffler somehow. I don't think there was enough left to positively identify the species after that road test. It blew the muffler apart.

    Also, if it's a 69, I believe they used A.I.R., at least in CA. Is something going on with the plumbing to the heads? Does it have an AIR pump?

  11. #10
    69Chateau is offline Cadillac Owners Member
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    Re: 1969 Deville - Exhaust whistle sound - acceleration

    Yes, it has a A.I.R pump...

  12. #11
    69Chateau is offline Cadillac Owners Member
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    Re: 1969 Deville - Exhaust whistle sound - acceleration

    Perhaps I'll start by going around the engine and do a dry compression test on each cylinder to see what happens. If I find one that's way off, I might hook up an air source and listen via stethescope to the tailpipe and see if I've uncovered something.

    How does that process sound?

  13. #12
    CADforce69 is offline Cadillac Owners Connoisseur
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    Re: 1969 Deville - Exhaust whistle sound - acceleration

    In good logic, if the problem comes from a valve leak, compression should be lower in the affected cylinder and you should be able to locate whistling sound there. If it was my car I would rather prefer it came from the carb baffle but if you didnīt touched your carb, itīs unlikely. Good luck!

  14. #13
    69Chateau is offline Cadillac Owners Member
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    Re: 1969 Deville - Exhaust whistle sound - acceleration

    Question: If its one particular exhaust valve leaking, wouldn't the "whistle" have a rhythmic pattern to it that would coincide with the compression and exhaust stroke within the affected cylinder? More of a fluttering whistle? The whistling I'm hearing is a constant whistling sound that has no discernible pattern to it.

    Just thinking out loud here... (And hoping a valve leak as nothing to do with this!)

  15. #14
    outsider is offline Cadillac Owners Connoisseur
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    Re: 1969 Deville - Exhaust whistle sound - acceleration

    could it be your uh...forget what it's called. It's a butterfly type thing that is spring loaded where your passenger side exhaust manifold meets the exhaust pipe. It's purpose is to help the engine warm up faster and is supposed to be open when the engine warms. Maybe it's not opening all the way and that is causing the whistle?

  16. #15
    CADforce69 is offline Cadillac Owners Connoisseur
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    Re: 1969 Deville - Exhaust whistle sound - acceleration

    Good thinking, outsider. Itīs something to check; the problem is that you have to unscrew exhaust manifold and some of the bolts use to be stuck and tend to break when they are forced.

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