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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; Hello 77CDV, sorry to see that you got in trouble with your cad. I hade the same issue than you ...
  1. #46
    jeff_herry is offline Cadillac Owners Member
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    Re: Troubles with the 77 CDV

    Hello 77CDV,
    sorry to see that you got in trouble with your cad. I hade the same issue than you with my 77 fleetwood 4 years ago, and more recently with my 78 fleetwood fuel injection. Exactlty the same things: good idling, and bucking at high speed. With my 77 carb, there were no evidence of backfiring. just a gazoline smell int he exhaust system, just like the engine was running a little bit too rich. With my fuel injected 78, I had lots of bacfiring. I solve the problem when I replaced the vacuum timing advance on the distributor, and the pickup coil. Have you check these part? of course you need to open the distributor, and remove quite everything inside to get the pickup coil and the timing advance system. I have the shop manual, so if you need any other info, just let me know !
    Good luck. Jeff.
    lacville78 likes this.

  2. #47
    Garys's Avatar
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    Re: Troubles with the 77 CDV

    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.
    Maybe not a stroke, but I would go ape man!
    The Ape Man and talismandave like this.

  3. #48
    The Ape Man's Avatar
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    Re: Troubles with the 77 CDV

    Quote Originally Posted by Garys View Post
    Maybe not a stroke, but I would go ape man!
    The FCC made me the Ape Man.

  4. #49
    Bro-Ham's Avatar
    Bro-Ham is offline Cadillac Owners Connoisseur
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    Quote Originally Posted by The Ape Man View Post
    The FCC made me the Ape Man.
    If they made you that way in the 70's I bet it is a CB handle!
    The Ape Man and talismandave like this.

  5. #50
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    talismandave is offline Cadillac Owners Master
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    Re: Troubles with the 77 CDV

    Quote Originally Posted by Bro-Ham View Post
    If they made you that way in the 70's I bet it is a CB handle!
    KXW 3878 mobile here, "The Shenandoah", ya got your ears on!
    The Ape Man and CADforce69 like this.

  6. #51
    Bro-Ham's Avatar
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    Quote Originally Posted by talismandave View Post
    KXW 3878 mobile here, "The Shenandoah", ya got your ears on!
    21-50, by

  7. #52
    talismandave's Avatar
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    Re: Troubles with the 77 CDV

    I can't remember what I walked into the bedroom for, but my FCC number I haven't used in 40 years, that I remember!

  8. #53
    The Ape Man's Avatar
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    Re: Troubles with the 77 CDV

    Nah it was a ham callsign. Sri fer hijack.

  9. #54
    77CDV's Avatar
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    Re: Troubles with the 77 CDV

    Sadly, your prediction is correct. Test drove the car last night. Got about 15 miles on the freeway when the symptoms reappeared. Got off ASAP and headed home on surface roads. The car could barely maintain 30 and stalled out completely a dozen times. I barely managed to limp her home and at this point, she's basically undriveable. I'll have to have her towed in Wednesday. The saga continues.

    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.

    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 : )

  10. #55
    Bro-Ham's Avatar
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    This seems so uncharacteristic of a 425 Cadillac, I hope it turns out to be something severely simple! My thoughts and prayers are with you for quick resolution of this madness!
    77CDV likes this.

  11. #56
    The Ape Man's Avatar
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    Re: Troubles with the 77 CDV

    Sorry it isn't fixed but at least you didn't get stuck in da 'hood.

    I remember you said there's a booster fuel pump somewhere. If the car is still also using the factory mechanical pump take a look at the 2nd line in post #10.

    The pump has a pressure release valve that's suppose to circulate fuel back to the tank. Keeping the fuel circulated helps with vapor lock.

    Sometimes these valves get gunked up or just plain don't hold pressure. When that happens the carbonator only gets enough fuel to keep the car moving at slow speeds. Usually a cold restart allows almost normal pressure.

    Easily the worst pre-computer Cadillac problem to diagnose I've run into in 34 years. My car had an almost new fuel pump when this happened to me.

    Pinching off the smaller return line with needle nose vice grips with a couple of fuel lines slid on their teeth is a quick way to check. Watch out for steering linkage clearance if you try this.

    If this IS your problem I'm really sorry I didn't take the time to describe it in detail earlier.

    Been there in 1983 or so.
    77CDV likes this.

  12. #57
    Bro-Ham's Avatar
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    Ape is the greatest! Craig, I hope this helps you get your car fixed! Now, Ape, when are you going to reveal all the secrets to having a trouble free 81 Cad with V8-6-4?
    77CDV and greencadillacmatt like this.

  13. #58
    The Ape Man's Avatar
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    Re: Troubles with the 77 CDV

    There's nothing in an 8/6/4 that wasn't in later DEFI cars which were regarded well except the modulated displacement itself which was extremely reliable.

    Cut the 3rd gear pressure switch wire and poof, no more modulated displacement. It didn't save much gas anyway.

    The V6 mode vibrated and made these cars feel like something one would want to trade in. Another annoyance was the idle speed motor could make drivers feel like the car was controlling them. Imagine waiting to pull out into traffic with just enough brake pedal pressure to hold the car. The AC compressor kicks in, the idle motor tries to compensate for the load and the idle increases 125 RPM. Now the car seems to lurch forward....................

    Probably best for a seperate thread.
    CADforce69 likes this.

  14. #59
    CADforce69 is offline Cadillac Owners Connoisseur
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    Re: Troubles with the 77 CDV

    Sorry to know the problem is not solved yet but I hope you get it solved soon with this good info, Craig.

  15. #60
    77CDV's Avatar
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    Re: Troubles with the 77 CDV

    Back in the shop today. We'll see what happens. Fingers crossed here.

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