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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, Troubles with the 77 CDV in Past Cadillac Vehicle Discussion; Originally Posted by 77CDV Bypassing/removing/permenantly altering emissions equiptment is not an option, since the car still has to pass CA's ...
  1. #31
    CADforce69 is offline Cadillac Owners Connoisseur
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    Re: Troubles with the 77 CDV

    Quote Originally Posted by 77CDV View Post
    Bypassing/removing/permenantly altering emissions equiptment is not an option, since the car still has to pass CA's biennial smog inspection.
    You could bypass it just to be sure the problem comes from there. If so, it will be easier to find and replace the bad part.

  2. #32
    77CDV's Avatar
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    Re: Troubles with the 77 CDV

    OK, so the car is back from the mechanic, and here's the deal. The throttle wasn't getting voltage from the oil pressure switch, and there was no vacuum to the distributor advance and the diverter valve was faulty. I'll be giving her a thorough test drive this weekend to make sure the issue is resolved.

  3. #33
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    Re: Troubles with the 77 CDV

    Quote Originally Posted by 77CDV View Post
    OK, so the car is back from the mechanic, and here's the deal. The throttle wasn't getting voltage from the oil pressure switch, and there was no vacuum to the distributor advance and the diverter valve was faulty. I'll be giving her a thorough test drive this weekend to make sure the issue is resolved.
    Wow. That does not sound like an average run-of-the-mill diagnostic routine or battery of tests. How did the car do otherwise on the cross-country trip? (I had my fingers crossed that it would make it home to you without any blemishes or mishaps on a car carrier.)

  4. #34
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    Re: Troubles with the 77 CDV

    Quote Originally Posted by Cadillac_Fan View Post
    Wow. That does not sound like an average run-of-the-mill diagnostic routine or battery of tests. How did the car do otherwise on the cross-country trip? (I had my fingers crossed that it would make it home to you without any blemishes or mishaps on a car carrier.)
    You mean, other than that, how was the play, Mrs. Lincoln? Aside from her crippling malfunction, Rebecca performed beautifully. AC blew cold, XM (via 8-track adapter) kept me entertained, rode like a dream, and generally crossed the country in a manner befitting a proper Cadillac. But, for all that she looks stunning, she's still 36 years old, and there will be times when her age catches up with her. Still wouldn't trade her for the world, and wouldn't hesitate to take her out on the road again.

  5. #35
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    Re: Troubles with the 77 CDV

    That is outstanding. Your '77 Cadillac is one of my all-time favorites on this forum. I was a little nervous when I read you were going to have to load her up on a car transport for the trip home. So glad she's back and getting the first-class treatment for some more world-class motoring!
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  6. #36
    lacville78 is offline Cadillac Owners Fanatic
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    Re: Troubles with the 77 CDV

    I am really glad you got her all sorted out! Nothing like these cars.
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  7. #37
    CADforce69 is offline Cadillac Owners Connoisseur
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    Re: Troubles with the 77 CDV

    Quote Originally Posted by 77CDV View Post
    You mean, other than that, how was the play, Mrs. Lincoln? Aside from her crippling malfunction, Rebecca performed beautifully. AC blew cold, XM (via 8-track adapter) kept me entertained, rode like a dream, and generally crossed the country in a manner befitting a proper Cadillac. But, for all that she looks stunning, she's still 36 years old, and there will be times when her age catches up with her. Still wouldn't trade her for the world, and wouldn't hesitate to take her out on the road again.
    Iīm glad the breakdown was located. Hope everything goes quiet and comfortable like it was until the problem happened. Cross my fingers too. We have to be understanding with these cars as although they are well maintained and even pampered, they still are near 40 year old vehicles (And in many cases they have a lot of miles on their backs) and some parts may fail at some point (most electronic failures are unpredictable). After all, Iīm sure they were not designed to last for so long. Your loyalty to Rebecca is laudable and your long trip with her is an example of courage and trust in your car.

    BTW, did you consider the option of following the trip home at a speed this malfunction didnīt happen?

  8. #38
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    Re: Troubles with the 77 CDV

    If the carbonator was not getting a good power source from the oil pressure switch the car would have hung up on high idle and the gas mileage would have been very poor.

    The diverter valve being bad would cause exhaust pops under high vacuum deceleration.

    Vac advance not working would make the car idle smoother and really lousy fuel economy.

    None of these things would cause the car to do what you described.

    I'd be real careful before doing any long trips.

    Just put 500 miles on my own car with a 1975 drivetrain last week. I'm a fellow who likes to weigh risk too : )

  9. #39
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    Re: Troubles with the 77 CDV

    Quote Originally Posted by The Ape Man View Post
    If the carbonator was not getting a good power source from the oil pressure switch the car would have hung up on high idle and the gas mileage would have been very poor.

    Vac advance not working would make the car idle smoother and really lousy fuel economy.

    10% to 20% worse would be hard to tell, 1 or 2 MPG?
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  10. #40
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    Re: Troubles with the 77 CDV

    Quote Originally Posted by talismandave View Post
    10% to 20% worse would be hard to tell, 1 or 2 MPG?
    A good working 77 Deville can get 18MPG on the highway at under 65MPH. Less at 70, probably 14.

    Without the vacuum advance I'd expect maybe 11 or 12 MPG at either speed. There's a giant difference in economy with the later manifold vacuum sourced vacuum advances.

  11. #41
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    Re: Troubles with the 77 CDV

    Rebecca, like all my 77s, is a CA spec car, so her mileage is a bit lower than you might expect from a federal spec car. Most I've ever gotten out of her is 16mpg at a steady 55 over flat terrain. Anyhow, we'll see what happens when I give her a good road test, probably tomorrow.

  12. #42
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    Crossing my fingers your car is fixed!

    I always chuckle when I read that a 425 Cadillac is capable of 18 MPG. I drive my 79 Cadillac with 425 daily - have put on 65,000 miles on it in 8 years. I also use the car as my magic carpet for trips from Florida to Wisconsin at least twice per year and wherever else I may go, near or far. It is a 14 MPG car regardless of if highway or local driving. My highest was 15 once on a trip. I have never driven a sustained 55 MPH on a trip, which is the world these cars were designed for (see, there's hope!), it would probably help fuel economy but 18 MPG out of a 425 just seems like dreaming the impossible dream to me.
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  13. #43
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    Re: Troubles with the 77 CDV

    Quote Originally Posted by Bro-Ham View Post
    Crossing my fingers your car is fixed!

    I always chuckle when I read that a 425 Cadillac is capable of 18 MPG. I drive my 79 Cadillac with 425 daily - have put on 65,000 miles on it in 8 years. I also use the car as my magic carpet for trips from Florida to Wisconsin at least twice per year and wherever else I may go, near or far. It is a 14 MPG car regardless of if highway or local driving. My highest was 15 once on a trip. I have never driven a sustained 55 MPH on a trip, which is the world these cars were designed for (see, there's hope!), it would probably help fuel economy but 18 MPG out of a 425 just seems like dreaming the impossible dream to me.
    Yeah, the best mileage I have ever got with my '79 FWB is 15 mpg (Federal car)also. I am hoping that the mechanic has in fact found the problem with Craig's car. Not getting power to the carb from the oil pressure switch seems odd to me. I don't recall the carburetor on a '77 having a power lead, except maybe the choke.
    front.jpg
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    Re: Troubles with the 77 CDV

    Guess some of you guys would have a stroke if you saw the mileage I got from my 1980 Fleetwood when it was all factory eqipped. Not to worry. I've dropped in a 500 now and am way down to 15 MPG mostly highway, 70 MPH.

  15. #45
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    Quote Originally Posted by Garys View Post

    Yeah, the best mileage I have ever got with my '79 FWB is 15 mpg (Federal car)also. I am hoping that the mechanic has in fact found the problem with Craig's car. Not getting power to the carb from the oil pressure switch seems odd to me. I don't recall the carburetor on a '77 having a power lead, except maybe the choke.
    <img src="http://www.cadillacforums.com/forums/attachment.php?attachmentid=140698"/>
    Nice looking 79 Fleetwood!

    ----------

    Quote Originally Posted by The Ape Man View Post
    Guess some of you guys would have a stroke if you saw the mileage I got from my 1980 Fleetwood when it was all factory eqipped. Not to worry. I've dropped in a 500 now and am way down to 15 MPG mostly highway, 70 MPH.
    So what is the secret?

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