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Thread: 2001 DTS on Life Support

  1. #31
    rcoq48 is offline Cadillac Owners Member
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    Angry Re: 2001 DTS on Life Support

    Thanks for the input everyone...things just seem to be getting worse. I noticed there was a change in the engine the past two days.

    Normally upon startup she will idle at about 1200 RPM for 30 seconds with an electronic motor or something sounds like it is pressurizing air before settling down and dropping to around 700 RPM. Does anyone know what causes this air pressurizing sound on startup?

    This morning the air pressurizing sounds like it was struggling hard, this caused my car to run extremely rough and die. I could not even drive into work today, had to get a ride.


  2. #32
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 2001 DTS on Life Support

    That's the AIR pump. It's more of a blower that pumps cold air into the exhaust manifold to quickly lite off the CAT. It runs for about 40 seconds or so at cold starts. If you hear it, it's either failing or the cover (#8 and/or #9) is off (not uncommon).

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  3. #33
    rcoq48 is offline Cadillac Owners Member
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    Re: 2001 DTS on Life Support

    I can definitly hear it and it sounds like it is failing. Does anyone have repair information on this?

    ----------

    Ranger which of those parts do I have to get or all of them? Is it just the pump and where is it located?

    ----------

    Could this be the source of my vacuum leak and rough idle? I feel this could be a breakthrough in the case!

  4. #34
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    When you buy the replacement, it'll include the pump, cover, and redesigned intake hose. The pump is mounted to the cradle, in front of the drivers side wheel well.

    It would have nothing to do with a vacuum leak.

  5. #35
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 2001 DTS on Life Support


  6. #36
    rcoq48 is offline Cadillac Owners Member
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    Re: 2001 DTS on Life Support

    OK I just picked up the new PCV valve hose and the Plenum duct, and gaskets have been ordered. If these two parts do not solve my vacuum leak I dont know what will.

  7. #37
    rcoq48 is offline Cadillac Owners Member
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    Re: 2001 DTS on Life Support

    Got my Parts! Since the AIR pump will not affect vacuum leak I am proceeding with repair of vacuum leak.

    Heres where I am at:

    -Intake manifold removed
    -New gaskets on Manifold
    -Intake manifold is extremely dirty and oily is cleaning recommended? even possible? or is this normal?
    -Manifold appears intact could find no cracks
    -Old Plenum appears intact, but am replacing anyway
    -I notice a hole at the bottom of the throttle body, I assume this is normal

    If I cant clean manifold and that hole is normal I will button her back up and pray to jesus the vacuum leak is gone.[COLOR="Silver"]

  8. #38
    rcoq48 is offline Cadillac Owners Member
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    Re: 2001 DTS on Life Support

    Here are the Pics:

    -New Plenum on the left
    -Look closely at near where the plenum attaches for the hole behind the TB, there is a lot of carbon build up
    Attached Images

  9. #39
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 2001 DTS on Life Support

    Intake manifold is extremely dirty and oily is cleaning recommended? even possible? or is this normal?
    Normal.


    I notice a hole at the bottom of the throttle body, I assume this is normal
    Hole? There is an over pressure relief valve there, but there should be no "holes".

    Courtesy of Submariner409

  10. #40
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    I think he means the hole in the crossover, between the TB and plenum.

  11. #41
    rcoq48 is offline Cadillac Owners Member
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    Re: 2001 DTS on Life Support

    Quote Originally Posted by MoistCabbage View Post
    I think he means the hole in the crossover, between the TB and plenum.
    Yes the Crossover would be the technical term...the hole is at the bottom and looks cast...not sure if it should be plugged or is meant to be open

  12. #42
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 2001 DTS on Life Support

    Now ya lost me.

  13. #43
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Oh, the EGR passage. Yes, it should be open.

  14. #44
    rcoq48 is offline Cadillac Owners Member
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    Unhappy Re: 2001 DTS on Life Support

    Ok so I got her buttoned back up. Wired and ready to fire.

    I hook the battery up and let the ignition sit to prime the fuel pump 30 seconds, then I turn the key....

    I've got crank, no ignition. What could it be now? I checked the valve on the fuel rail, by depressing the needle and there seems to be no fuel pressure.

    Has my Fuel pump gone out now too? What is with this car? It NEVER ends?

    I should say I am not surprised .....FML

  15. #45
    Manic Mechanic is offline Cadillac Owners Fanatic
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    Re: 2001 DTS on Life Support

    I just read through your posts and have a suggestion. Get the rear of the car up safely and look for the wire harness plug for the fuel pump module in the tank. I'm not sure where it is as I've not yet had to mess with one. It will be about six wires in one connector that leads to the top of the fuel tank from the main harness. It may be clipped up near the tank. Once found disconnect it and look closely for damaged, burnt or loose terminals. Make any necessary repairs then connect it firmly until the lock clips together. See if you have fuel pressure now.

    I'm not doubting your intake leak problems, air pump, and the fixes etc. but you have an intermittent fuel pump, lean codes, no fuel pressure at cranking, and also codes for the other two circuits that use the same plug that indicate a loose or no connection. Those would be the fuel level sensor and fuel tank pressure sensor codes. All of these together indicate an open circuit in the plug they all share. Sounds like it's not fully connected back there.

    Vernon

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