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Thread: Mysterious failure in my 2000 STS - in Spain

  1. #16
    moses101 is offline Cadillac Owners Member
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    Re: Mysterious failure in my 2000 STS - in Spain

    I have a question: the fuel pump works forced by the dirty filter, but only produces car stop at random. So if I measure the pressure when operating the fuel pump, the pressure will be normal. I should look at the pressure in the five or ten minutes it stops working before returning to work again.


  2. #17
    Submariner409's Avatar
    Submariner409 is online now If it won't run, chrome it
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    Re: Mysterious failure in my 2000 STS - in Spain

    That will prove nothing - IF there is a tiny leak in the fuel pressure regulator and/or a slightly sticky fuel injector the fuel rail pressure will bleed off rapidly. It takes less than 1/2 ounce of fuel return or leakage to completely de-pressurize the fuel system. If the fuel pressure jumps to 40 psi at Key: ON then you can assume that the filter(s) are good - if the system maintains the specified 41 - 47 psi running at idle, then your stalls are a different problem unless there is some intermittent fuel pump shutdown fault or a bad electrical connection.

  3. #18
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Mysterious failure in my 2000 STS - in Spain

    I have seen old ailing fuel pumps fail intermittently. Not real common, but can't be ruled out. The only way to really test it is to use a fuel pressure gauge with a long hose and tape it to the windshield. Then watch the pressure when the engine quits to see it is pressure related.

  4. #19
    Mark C's Avatar
    Mark C is offline Cadillac Owners Connoisseur
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    Re: Mysterious failure in my 2000 STS - in Spain

    Also look for crushed fuel lines, the pump might be able to build enough pressure at idle, but with a crushed fuel line it may not be able to supply enough volume of fuel to keep the engine running. If it stalls following a run on the highway and is hard to restart (requiring more than a couple of seconds of cranking the eninge), that would be a good guess, assuming its not crank sensors.

  5. #20
    98eldo32v's Avatar
    98eldo32v is offline Cadillac Owners Connoisseur
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    Re: Mysterious failure in my 2000 STS - in Spain

    Moses101,

    If you have "Service Transmission" on your display. You have bigger problems than fuel.......

    Start looking for a transmission......

  6. #21
    moses101 is offline Cadillac Owners Member
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    Re: Mysterious failure in my 2000 STS - in Spain

    Quote Originally Posted by 98eldo32v View Post
    Moses101,

    If you have "Service Transmission" on your display. You have bigger problems than fuel.......

    Start looking for a transmission......
    In Barcelona Cadillac dealer made ​​me a budget of $ 9,000 to change the gearbox. (a reconstructed one!!). In an unofficial workshop rebuilt for $ 2400, but the mechanics of my country do not know how to program the gearbox properly once fixed, and therefore appears on the screen Transmission Service.
    Anyway, I can drive with a gearbox that makes noise, but I can not drive with a fuel pump intermittently failing and causing the car stops. .

  7. #22
    stoveguyy is offline Cadillac Owners Connoisseur
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    You can clear serv trans message. And you cannot drive forever with trans noise. At some time, trans will fail and you will no longer move. That's why cars are sitting on side of road. Broken.

  8. #23
    moses101 is offline Cadillac Owners Member
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    Re: Mysterious failure in my 2000 STS - in Spain

    Unfortunately, if any repair shop can give me a solution to my problem with the gearbox, I have only one option: sell the car ... who wants a broken down car? All my car faults appear and disappear as if by magic. I can do 500 miles without problems and suddenly be stopping every ten miles. I'm excited to have a Cadillac, but it's hard to have it in my country. The mechanics look at it as a rare thing and I'm not mechanical. So, I'm writing in this forum. I went to the shop and asked him to look up the pressure and asked: "Do you know which one is the pressure should be?". Ha, ha, what a professional.

  9. #24
    stoveguyy is offline Cadillac Owners Connoisseur
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    So it works today. Can you sell it today before it acts up again? Would you tell buyer it has issues?

  10. #25
    98eldo32v's Avatar
    98eldo32v is offline Cadillac Owners Connoisseur
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    Re: Mysterious failure in my 2000 STS - in Spain

    Well,

    Unless to can arrange for shipping of a used transmission, (which is still a roll of the dice) to your country and then have someone reputable install it, you and that car are on borrowed time.

    The "service transmission" message is NOT a message I would wish on anyone. I don't like transmission issues, that's whay when you have one that functions, service it when scheduled.

    Good luck my friend.....

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