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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; It is splitting hairs, 14, 15, 16.5, 18 - - and even though some may have been lucky to break ...
  1. #76
    Bro-Ham's Avatar
    Bro-Ham is offline Cadillac Owners Connoisseur
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    It is splitting hairs, 14, 15, 16.5, 18 - - and even though some may have been lucky to break 15, I have not that I recall. So put that in your pipe and smoke. I will cocktail!
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  2. #77
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    Re: Troubles with the 77 CDV

    When you drive Cadillacs for many years the savings adds up. I've been driving them 80 percent on / 20% off for 34 years.

    No matter what size the engine is, cost is a factor. The large Cadillac engines were designed to behave like smaller earlier engines with less stringent emissions requirements. Economy was part of the design hence the rear axle ratios.

    I see a pattern of comparison to other auto manufacturers. Later Cadillacs were more generic. These older engines were much better quality than lower level GM makes. They were built to last longer and deliver decent fuel economy.

    Modifications and tuning can ruin economy. Cheaper makes are sometimes way easier to properly maintain.

    As said here before, it's a shame a real Cadillac engine never received a smart sequential fuel injection / advanced ignition timing overdrive transmission treatment. It would have stacked up very well compared to the ancient Small Block Chevy which was pressed into RWD Cadillac service.

    See you at the gas station.
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  3. #78
    deVille33 is offline Cadillac Owners Connoisseur
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    Re: Troubles with the 77 CDV

    Quote Originally Posted by Bro-Ham View Post
    It is splitting hairs, 14, 15, 16.5, 18 - - and even though some may have been lucky to break 15, I have not that I recall. So put that in your pipe and smoke. I will cocktail!
    LOL, A lot of this is related to how you drive, how heavy your right foot is, and the conditions relative to the routes and speeds you travel. I had a Pontiac Grand Am, that could get close to 18 if I could keep my foot off the floor. How I loved to hear that quad at WOT and feel my back side pushed into the seat, plus the rush of a buck twenty down the Interstate. I drive more conservatively now. Let those go around me, I catch up to them at the next stop light.
    The Ape Man likes this.

  4. #79
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    Quote Originally Posted by Koooop
    Come to think of it, I did have somebody put a plug in place of the PCV in an LT1. That caused a similar issue. That's easy to test, Just pull the PCV off the valve cover and take it for a ride. Cover it or you will have a big Oily mess on your hands.

    Once I drove the LT1 with that issue for a while, the vacuum pressure buildup inside the motor made it buck, cough and stall but it took 20 minutes or so. It was over pressurizing the crankcase.

    I do recall having some bizarre PCV problems with some of my 1977 sedan Deville's. the giant poof of blue smoke going up a steep hill every now and again was a real stumper to figure out.
    I need to correct this.

    It's been a long time, when I had this issue it was PCV related, not EGR.

    Maybe that'll make sense now.

    I'm losing it...

  5. #80
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    Craig, is there resolution? We need to keep these yellow Cadillacs rolling! Dave
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  6. #81
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    Re: Troubles with the 77 CDV

    Finally got her back yesterday. The final culprit turned out to be the mechanical fuel pump. Seems the diaphragm had disintegrated, and the aux electric pump doesn't develop enough pressure to keep the car running beyond idle. I would never have suspected it, since the pump was replaced 5 years ago. Guess that ethanol is just doing wonders for our cars!

    Anyway, she's back home now and runs like a dream again. Thanks for all the help, guys!

  7. #82
    CADforce69 is offline Cadillac Owners Connoisseur
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    Re: Troubles with the 77 CDV

    I´m glad to know finally Rebecca is fixed and above all, the solution was so simple. Anyway, I think today´s parts for yesterday´s cars have not the same quality than those made when these cars were new... I could tell you a few examples with my dodge (which has made 24K miles with me).

  8. #83
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    Glad to hear it is on the road again! I always try to fill with ethanol free fuel, I could have sworn there were folks on this forum who said it made no difference.

  9. #84
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    Re: Troubles with the 77 CDV

    I use ethanol-free in all my classics, my John Deere, and my snow blower. Only the 90s and later cars get the E10. Although, I do recall reading in mom's 1984 FWB owner's manual that the car is "gasahol" safe...

  10. #85
    jamespowers is offline Cadillac Owners Connoisseur
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    Re: Troubles with the 77 CDV

    Quote Originally Posted by jayoldschool View Post
    I use ethanol-free in all my classics, my John Deere, and my snow blower. Only the 90s and later cars get the E10. Although, I do recall reading in mom's 1984 FWB owner's manual that the car is "gasahol" safe...
    Riiiiggghhhtttt.....Gasahol safe. Riiiiggghhhttt. lol lol lol As the ethanol rots the gas lines and ruins the engine.

  11. #86
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    Re: Troubles with the 77 CDV

    Hey! They only warrantied them for twelve months back then, they were safe making that statement!
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  12. #87
    jamespowers is offline Cadillac Owners Connoisseur
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    Re: Troubles with the 77 CDV

    Quote Originally Posted by talismandave View Post
    Hey! They only warrantied them for twelve months back then, they were safe making that statement!
    Yeah and twelve months and one day later they blew like Mt. Vesuvius.
    CadillacLuke24 likes this.

  13. #88
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    Re: Troubles with the 77 CDV

    Quote Originally Posted by 77CDV View Post
    Finally got her back yesterday. The final culprit turned out to be the mechanical fuel pump. Seems the diaphragm had disintegrated, and the aux electric pump doesn't develop enough pressure to keep the car running beyond idle. I would never have suspected it, since the pump was replaced 5 years ago. Guess that ethanol is just doing wonders for our cars!

    Anyway, she's back home now and runs like a dream again. Thanks for all the help, guys!
    Glad the problem is corrected but the explanation needs work. If the diaphragm were at fault the pump would either not work at all or it would dump raw fuel into the engine oil. Not a normal failure for Cadillac engines of this vintage. Additionally the problem you had was intermittent.

    What was really happening was the pump's internal bypass valve was hanging open. This reduces fuel pressure to a very tiny amount.

    Anyone driving these cars anywhere distant should bring along needle nose vice grips with a pair of fuel lines slipped on the teeth. This can be used to pinch off the fuel pump to tank return line as described in my previous posts in this thread. That will get you home.
    77CDV and Garys like this.

  14. #89
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    Re: Troubles with the 77 CDV

    Quote Originally Posted by The Ape Man View Post
    Glad the problem is corrected but the explanation needs work. If the diaphragm were at fault the pump would either not work at all or it would dump raw fuel into the engine oil. Not a normal failure for Cadillac engines of this vintage. Additionally the problem you had was intermittent.

    What was really happening was the pump's internal bypass valve was hanging open. This reduces fuel pressure to a very tiny amount.

    Anyone driving these cars anywhere distant should bring along needle nose vice grips with a pair of fuel lines slipped on the teeth. This can be used to pinch off the fuel pump to tank return line as described in my previous posts in this thread. That will get you home.
    Just added to my '79 Fleetwood's tool box!
    77CDV likes this.

  15. #90
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    Re: Troubles with the 77 CDV

    Quote Originally Posted by 77CDV View Post
    Finally got her back yesterday. The final culprit turned out to be the mechanical fuel pump. Seems the diaphragm had disintegrated, and the aux electric pump doesn't develop enough pressure to keep the car running beyond idle. I would never have suspected it, since the pump was replaced 5 years ago. Guess that ethanol is just doing wonders for our cars!

    Anyway, she's back home now and runs like a dream again. Thanks for all the help, guys!
    FWIW there's a site where you can check for local stations that offer ethanol free brews.

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