2001 DTS on Life Support
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 2001 DTS on Life Support in Past Cadillac Vehicle Discussion; Gentlemen, I have a 2001 Cadillac Deville Touring Sedan (203,000 miles) I love this car! Here are my Current Codes: ...
  1. #1
    rcoq48 is offline Cadillac Owners Member
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    2001 DTS on Life Support

    Gentlemen,

    I have a 2001 Cadillac Deville Touring Sedan (203,000 miles) I love this car!

    Here are my Current Codes:

    IPM B0248 - Heat/Defrost/AC Door Range Error
    IPM B0249 - Temperature Control Door #3 Inop.

    PCM P0171 - Fuel Trim Lean Bank 1
    PCM P0174 - " " " Bank 2
    PCM P0452 - Fuel Tank Pressure Sensor Cicruit Low Voltage
    PCM P0463 - Fuel Level Sensor Circuit High Voltage
    PCM P1189 - Engine Oil Pressure Switch Circuit

    Here are the symptoms:
    - Intermittent Long Crank on start up
    - Rough Idle Prone to Stalling at times
    - When driving if too much throttle is given the car will stall
    - Must accelerate very slowly to avoid stalling
    - Combined MPG down from approx 20 MPG normal, to approx 15MPG current
    - Driver Constantly worried about stalling while driving

    I have tried a few things after reading posts and researching. I suspect there is a vaccum leak somewhere in the system. I have cleaned Throttle Body, I have replaced PCV, I have replaced intake blue intake gaskets on bottom on intake manifold. I am unable to locate the vaccum leak.

    Do I need a smoke machine? Is there any way to locate this suspected vaccum leak? Could this be a fuel delivery problem?

    Any help is appreciated!

    Frustrated Caddy Owner

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  3. #2
    basscatt's Avatar
    basscatt is online now Cadillac Owners Master
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    Re: 2001 Caddy DTS on Life Support NEED MD!!! Help

    Quote Originally Posted by rcoq48 View Post
    Gentlemen,

    I have a 2001 Cadillac Deville Touring Sedan (203,000 miles) I love this car!

    Here are my Current Codes:

    IPM B0248 - Heat/Defrost/AC Door Range Error
    IPM B0249 - Temperature Control Door #3 Inop.

    PCM P0171 - Fuel Trim Lean Bank 1
    PCM P0174 - " " " Bank 2
    PCM P0452 - Fuel Tank Pressure Sensor Cicruit Low Voltage
    PCM P0463 - Fuel Level Sensor Circuit High Voltage
    PCM P1189 - Engine Oil Pressure Switch Circuit

    Here are the symptoms:
    - Intermittent Long Crank on start up
    - Rough Idle Prone to Stalling at times
    - When driving if too much throttle is given the car will stall
    - Must accelerate very slowly to avoid stalling
    - Combined MPG down from approx 20 MPG normal, to approx 15MPG current
    - Driver Constantly worried about stalling while driving

    I have tried a few things after reading posts and researching. I suspect there is a vaccum leak somewhere in the system. I have cleaned Throttle Body, I have replaced PCV, I have replaced intake blue intake gaskets on bottom on intake manifold. I am unable to locate the vaccum leak.

    Do I need a smoke machine? Is there any way to locate this suspected vaccum leak? Could this be a fuel delivery problem?

    Any help is appreciated!

    Frustrated Caddy Owner
    -----------------
    PCM P0171 - Fuel Trim Lean Bank 1
    PCM P0174 - " " " Bank 2

    Rough Idle Prone to Stalling at times
    - When driving if too much throttle is given the car will stall
    - Must accelerate very slowly to avoid stalling
    - Combined MPG down from approx 20 MPG normal, to approx 15MPG current
    - Driver Constantly worried about stalling while driving


    all this is caused by a torn plenum -
    the rubber bellows-looking thing - between the throttle body and intake -

    they usually split on the bottom - run your finger in the groove - you will find it -

    amazon.com had a "kit" put together - the plenum and the intake gaskets -

    http://www.amazon.com/gp/product/B00...=ADG953YR6NRBF

    there should be a "HOW-TO" either in the NorthstarPerformance forum - or the TechTips forum -

  4. #3
    98eldo32v's Avatar
    98eldo32v is offline Cadillac Owners Connoisseur
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    Re: 2001 Caddy DTS on Life Support NEED MD!!! Help

    There is an elbow fitting that attaches to the throttle body with a pipe/hose. Inspect that fitting. Every one I've taken off has a split in it. That could be the source of the vaccuum leak.
    rcoq48 and rcoq48 like this.

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 2001 Caddy DTS on Life Support NEED MD!!! Help

    With a P0171 & P0174 code I'd put money on a ripped plenum duct.

  6. #5
    rcoq48 is offline Cadillac Owners Member
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    Thumbs up Re: 2001 Caddy DTS on Life Support NEED MD!!! Help

    Gentlemen,

    WE HAVE ACCELERATION!!!!

    Thanks for the help, here's is what I discovered. First of all I am getting really good at removing the intake manifold lol...I've done it so many times. After close inspection the Plenum is 100% intact. I cleaned it up, looked it over, shine a flashlight on it and rubbed my hands on it. It is safe to say the Plenum is 100% in working order.

    I did replace the elbow on the throttle body as y'all recommended, there WAS a hairline fracture in the plastic, good call. I also believe the Secondary Air System has been removed on this DTS. I am stationed in Yuma, AZ and they do no run emissions here, so no harm no foul. Except, I believe the secondary air system is partial cause of the vacuum leak. After messing with different tubing connected to the throttle body. I noticed the idle really steadied out when the line above the Fuel Pressure Regulator is blocked (my finger over it). I stuck a golf tee up there to keep it blocked off, i know it is a jerry rig. But the test drive was much better. There was some sensor attached also that was giving off a hissing sound intermittently (must be a leak). Does anyone know what this sensor is? It was orange in color connected to the same wires as the fuel injectors and bolted to the back bank of cylinders on the valve cover. I have No idea what that is!

    I think there is still a slight vacuum leak. I can hear a hissing sound over by the power steering pump near the back side of the manifold.
    After clearing the codes I am still getting a P0171 and P0174, but it is remarkably better!!! I will do more further investigation tomorrow and report the findings. Thanks for the support!

    Cadillac for life!
    98eldo32v and 98eldo32v like this.

  7. #6
    Ranger's Avatar
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    Re: 2001 Caddy DTS on Life Support NEED MD!!! Help

    Hissing sound by the back bank might be the PCV line. Check the fit in the grommet mounted in the rear cam cover. Can't recall if the '01 has a rattle can PCV valve or the metered orifice, but either way, the hose should fit tight in the grommet.

    Not sure what vacuum line you plugged, but it might have been for the AIR pump check valve. There should be two, one on the rear cam cover and one up front near the W/P belt cover. Maybe there is another open vacuum line.

    As for the orange hissing sensor. A picture would be worth a thousand words.

  8. #7
    13ir14314's Avatar
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    The orange sensor on the back is the AIR system solenoid. I belive 01 still has a rattle PCV that wasn't changed until 02.

  9. #8
    98eldo32v's Avatar
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    Re: 2001 Caddy DTS on Life Support NEED MD!!! Help

    There is a vaccuum line that runs from the rear of the intake manifold to the right side strut tower.

    I believe there is a check valve on the line that the intake hose attaches to. I think that line runs to the heater system. Double check the line from the intake to the check valve, and the valve itself for leaks.

  10. #9
    Ranger's Avatar
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    Re: 2001 DTS on Life Support

    The HVAC controls went from vacuum to electrical on the 2000 Devilles. There should be no vacuum going to or through the firewall on the 2000+'s..

  11. #10
    98eldo32v's Avatar
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    Re: 2001 DTS on Life Support

    Ranger is correct.

    Had to double check my deville. The pre 00's must be vaccuum actuated.

    I can't see what could be causing a hissing by the pump. I'd have to remove my top engine cover for further inspection......

  12. #11
    Ranger's Avatar
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    Re: 2001 DTS on Life Support

    Quote Originally Posted by 98eldo32v View Post
    The pre 00's must be vaccuum actuated.

  13. #12
    rcoq48 is offline Cadillac Owners Member
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    Re: 2001 DTS on Life Support

    Gents,

    The Smoke Test Reveals All! Man the smoke machine is so efficient, why have I been racking my brain trying to find this vacuum leak>? I should have used the smoke from the start. Never again will I attempt vacuum leak diagnosis with out a smoke machine!!!

    The first leak I spotted with the smoke machine was from the TPS sensor, located on the Throttle Body. I removed the TPS sensor to find +200,000 miles worth of carbon buildup! My goodness was it dirty. I cleaned it up and attempted to replace the O-ring. However the O-ring was an oddly extremely thin O-ring, could not find a suitable replacement so just reused it. Then I checked the valve right above it. I think the IAC valve? or possible EGR valve? it was also extremely dirty. A little wire brushing and tightening down licked those two pesky leaks.

    Then as the pressure from the smoke machine continued to build, a thin wasp of smoke came from the back on the intake manifold. I removed the intake manifol to find a cracked brittle PCV valve hose! I suspect this was the culpirt all along!!! This PCV hose was not available anywhere in Yuma, AZ good grief. It cost $56 to have delivered to the Cadillac dealership, will have it Friday. I jimmy rigged some fuel line and radiator line to connect the "rattle style" PCV valve back to the Intake Manifold. Kind of a pain due to the way the PCV hose connects way down deep in the intake manifold! It makes it impossible to get a hose clamp on there. Oh the Joys of Cadillac Maintenance!!!

    After reconnecting everything and checking smoke once more...... GREAT SUCCESS!! Caddy is running like a TOP codes have all gone and SES light is gone we will see how long that lasts! LOL

    Thanks for the Help Everyone!

    You are right on track with the AIR sensor solenoid, that must be the orange sensor that was hissing! What affect will that have if any by essentially blocking the AIR system? Will this affect my HVAC??

  14. #13
    98eldo32v's Avatar
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    Re: 2001 DTS on Life Support

    As previously stated, since the HVAC system is electrical no harm there. Even if it was vaccuum actuated, you're just blocking off the A.I.R system. As long as there aren't any other leak sources, everything should function fine.

    Glad you fixed it, enjoy the car......

  15. #14
    Ranger's Avatar
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    Re: 2001 DTS on Life Support

    Quote Originally Posted by rcoq48 View Post
    The first leak I spotted with the smoke machine was from the TPS sensor, located on the Throttle Body. I removed the TPS sensor to find +200,000 miles worth of carbon buildup! My goodness was it dirty. I cleaned it up and attempted to replace the O-ring. However the O-ring was an oddly extremely thin O-ring, could not find a suitable replacement so just reused it. Then I checked the valve right above it. I think the IAC valve? or possible EGR valve? it was also extremely dirty. A little wire brushing and tightening down licked those two pesky leaks.
    The TPS does not come in contact with carbon and I do not believe that there is any O ring involved. I suspect you may be talking about the IAC valve. The IAC valve is above the TPS.

    Courtesy of Submariner409
    P.S. This is a Seville so your air filter housing will be slightly different.

  16. #15
    rcoq48 is offline Cadillac Owners Member
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    Re: 2001 DTS on Life Support

    I do believe it was the TPS Sensor, it was on the side of the TB, and it was really dirty inside. I connects the the throttle plate and has a rotational peg, held on by two screws. If you look at the inside of the sensor you will see a blue o-ring.

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