Question about 1984 Cadillac Eldorado

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84 Caddy Eldorado Was acting like the choke was sticking. Put a can of sea foam in the tank and drove it 25 miles Next morning it would belch and fart and try to start, once in a while it would fire up and run really rough, black smoke from the exhaust. Changed the fuel filter no improvement Plugs, wires cap rotor, no improvement. Dropped the tank, cleaned it and put new gas, no improvement. Installed new fuel pump and pickup strainer, no improvement. I can see fuel firing out of the injectors. only tries to fire with throttle full open. No pedal, no fire at all.

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  • mitchreid May 30, 2010

    I think the guy I was working with is off for the weekend and I still need help.
    I replaced the regulator and it still does the same thing.

  • mitchreid Jun 23, 2010

    Replaced the coil and same symptoms. It ran rough for about twenty seconds then bogged and died. It spins and tries to start but it sounds like only two or three cylinders are firing. The injectors are firing a good solid pattern

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  • Master
  • 1,857 Answers

On a 84 carb model non computerized there are only two reasons a vehicle will run full rich ( black smoke). If the carb float is stuck open. What happens is a small piece of varnish gets on the fuel shutoff pintle and the bowl overfills. The height of the fuel in the carb regulates how rich a car will idle and cruise. WhatI would do is remove the top of the carb being carful notto mess up the gasket. Remove the pin for th float carefully catching the valve as it falls out. The inspect carefully with a magnifying glass the valve and where it seats on the chamber.

The second reason is a fuel pump thats over pressureized.

Also by now the plugs may be pretty fouled out again and the added strain of the coil trying to fire a weak ignition could of caused it to fail or at least become weaker. So be aware of this when you end up having a no spark condition.

Posted on May 30, 2010

  • 3 more comments 
  • mitchreid May 30, 2010

    It's throttle body injection. No float bowl.
    My son says the plugs are clean but wet



  • Susan Price May 30, 2010

    by the way the coolant sensor is important on these older cars. If its skewed off a bit the car will have issues.

  • mitchreid May 30, 2010

    If the battery is real low would the starter take all the juice even with jumper cables and not leave enough for the coil?
    It has brand new plugs, wires, cap and rotor
    Son says the plugs are clean but wet.


  • Susan Price May 31, 2010

    This vehicle has a map sensor. This part is the fuel altitude sensor. If its unplugged or the vacuum hose to it is colgged you will get the results your getting. also if you have a vacuum leak on the intake you will have the same issues/

    Being a TBi you also have a crank sensor that you can test if you know how. Also the map sensor can be tested. Go to mitchell1diy online if you dont have any reference material. Being this old of a car anythings possible. Even a failed computer could be the problem

  • Susan Price Jun 15, 2010

    Because you stated your getting fuel because it belched out black smoke I don't think you have a fuel issue. Heres one test you can do. Unplug the fuel pump or fuse to it. Then spray quick start or brake cleaner to get it to start. This is the test all mechanics do to verify off the bat if its a fuel issue or an ignition issue, If it still will not run any better when someone feathers the spray in then the problem is the coil or ignition module. A KV test could be performed to see if you have a weak coil which I suspect if this coil is a bit old. But a special tool would be needed to test it. Doing a fuel pressure test would verify it wasn't a fuel pump issue.



    You know most shops could of figured this out for about a hundred bucks which would of been cheaper than the route you;ve gone. About the only thing left is the coil, ignition module and the computer. and possibly a poor engine and body grounds.



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  • Master
  • 2,317 Answers

It sounds like a bad fuel pressure regulator diaphragm, which is flooding out the engine. And probably the spark plugs are fouled out, caused by excessive gas from the bad pressure regulator. Here's a picture of the regulator diaphragm. It is part of the throttle body, but is replaceable.84 Caddy Eldorado  Was acting like the choke was - 84770c2.jpg

Posted on May 26, 2010

  • 8 more comments 
  • mitchreid May 26, 2010

    Where in the throttle body is the regulator?
    Any special tools needed?
    Anything to be specifically careful with? Tiny spring loaded parts to keep track of?
    Any way to test that it is the problem before tearing into it?


  • James Milzheimer
    James Milzheimer May 27, 2010

    It is mounted in the top part of the throttle body. You'll need some Torx bit screwdrivers. There is a gasket to becareful with. There will be a spring, but not a small one. Once you remove it, if there is a hole in the diaphragm, it's bad.

    You'll need to remove the regulator screws.


  • mitchreid May 29, 2010

    Replaced the regulator It almost started but is still acting the same, like it wants to start but isn't getting enough fuel. I can see the injectors firing so there is fuel getting in but still only at full open throttle. The new spring in the regulator kit is shorter than the original but it feels like they have about the same strength when compressed

  • James Milzheimer
    James Milzheimer May 31, 2010

    Did you check the plugs to see if they are fouled?

  • mitchreid May 31, 2010

    Plugs are clean but wet
    It tried to start, bucked and belched for about twenty seconds and then died.
    Since then it is doing exactly the same thing. It tries to fire over but just doesn't quite go then it goes back to just spinning over for a few seconds and then tries to fire again.


  • James Milzheimer
    James Milzheimer May 31, 2010

    The only other thing I can think of would be the computer itself. I did have a GM do something similar, and the computer was bad, but over the years, I've used the GM repair Flow Charts, and they always tell you to replace the ECM, but that rarely fixed the piticular problem, it was always something else, that's why I cautious about saying the computer is bad. You might want to check the resistance of the two injectors. A GM dealership or maybe Auto Zone could give the resistance value, (Ohms). One other thing, check the wiring going to the throttle body, where it attaches to the throttle body.

  • James Milzheimer
    James Milzheimer May 31, 2010

    I'm wondering if it may have jumped time? Or something with the timing chain or firing order.

  • mitchreid May 31, 2010

    OK He says that two plugs on the drivers and one plug on the passengers are wet. The others are black but not fouled

  • mitchreid May 31, 2010

    He also found that the guy who put in the new plugs broke one. He replaced it with one of the old ones Also double checked the firing order it is correct.

  • mitchreid Jun 14, 2010

    Next thing I thought maybe the varnish gasoline had plugged the catalytic so I took that off.
    Charged up the battery and hit the key, it started and ran for fifteen seconds then bogged and died. Tried it again, it cranked and then started, ran for about ten seconds backfiring at four second intervals and then popped and died. di the same thing about seven times and then the battery got a little low and it just cranks and doesn't fire at all. All this still with full open throttle. No pedal, no fire at all.


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