2001 Cadillac DTS Can't get up to speed, power loss, studdering, See Video
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Northstar Engines and System Technical Discussion Discussion, 2001 Cadillac DTS Can't get up to speed, power loss, studdering, See Video in Cadillac Engine Technical Discussion; My DTS had started to run bad and eventually was getting horrible gas mileage. After some research I found out ...
  1. #1
    WeBeAutos is offline Cadillac Owners Member
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    2001 Cadillac DTS Can't get up to speed, power loss, studdering, See Video

    My DTS had started to run bad and eventually was getting horrible gas mileage. After some research I found out that it was the Plenum, so I picked it up at my local Caddie dealer and was ready to replace it.

    My wife was on her way home and she said she couldn't get up to speed and the car would just die out, she said that she couldn't get it past 20 mph as if the traction was on or it was starving for fuel. I used my code scanner when she got home and found a Intake and a loss of memory code, I don't exactly remember what they were because before I went on the 1st drive after replacing the Plenum I erased the codes. I took it for a ride after replacing the Plenum and it has the same issue and no codes?

    Any Ideas?

    Thanks any help would be greatly appreciated,
    ///Michael

    Here is a Video

    [YOUTUBE]<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/FSQVXpTKl6c&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/FSQVXpTKl6c&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>[/YOUTUBE]

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: 2001 Cadillac DTS Can't get up to speed, power loss, studdering, See Video

    Instead of using the hand scanner, use the car's built-in code system and reader. Study the entire sticky thread at the top of the main Deville page titled "How to pull codes", use the link to the site with "obd2" (OnBoard Diagnostics protocol - OBD-II) in the URL. Practice. Write down all the stored codes, noting whether they are Current or History. Then return to the site to get the meanings of the P,B,C, and U codes. Do not "clear codes" yet. Come back here.

    That idling engine should be absolutely dead quiet.

    I believe I hear a massive vacuum leak - near the passenger end of the intake. Is the PCV system hooked up correctly, the manifold bolts torqued to 7 ft/lb (89 in/lb), did you check the manifold overpressure valve (passenger end recess) for seal, how about the integrity and alignment of the intake ducting and MAF, the vacuum lines at the throttlebody connectors ?

    EDIT at 4:23: Watching your other questions brings up the cat thing........Do you have any reason to believe that the cat is suddenly plugged, as from operation with too rich a fuel mixture or some other foreign substance ? Midrange power losses are sometimes cat-related.

    This one's a brain teaser........

  4. #3
    WeBeAutos is offline Cadillac Owners Member
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    Re: 2001 Cadillac DTS Can't get up to speed, power loss, studdering, See Video

    Wow! Thats Great!

    I pulled Loads of History codes, but only one current IPM B0429

    Fuel Pump?

    Thanks
    ///Michael

  5. #4
    WeBeAutos is offline Cadillac Owners Member
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    Re: 2001 Cadillac DTS Can't get up to speed, power loss, studdering, See Video

    B0429 is an Actuator :-(

    Here is the History, what do you think?

    DIM B1327
    DIM B2810
    DIM P1531
    DIM U1300
    DIM U1301
    IPM B0429
    IPM B1004
    IRC B1327
    IRC U1064
    IRC U1016
    MSM B1860
    RFA B1327
    TTM B1396
    TTM B2891
    TTM B2862
    TTM B1328
    TTM B1327
    TTM B2862
    TTM B2860
    TTM B2882
    TTM B2880


    Thanks!
    ///Michael

  6. #5
    WeBeAutos is offline Cadillac Owners Member
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    Re: 2001 Cadillac DTS Can't get up to speed, power loss, studdering, See Video

    The cat could be clogged, but when the plenum went my wife drove it for 4/5 days while it was running lean...Could that have toasted the cat?

    BTW I just replaced the Battery(B1327) and Blower Motor.

    Thanks!
    ///Michael

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    Submariner409's Avatar
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    Re: 2001 Cadillac DTS Can't get up to speed, power loss, studdering, See Video

    The lean codes/fuel ratios from a cracked plenum should not toast the cat. Most cat problems come from either rich fuel mixtures or attempts at burning various solvents and engine cleaner mixtures.

    Go back to the code thread and decipher all those B codes (body control codes) and the P1531. (If all the codes are History, then something is fishy. With your symptoms, one or more are Current.)

  8. #7
    WeBeAutos is offline Cadillac Owners Member
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    Re: 2001 Cadillac DTS Can't get up to speed, power loss, studdering, See Video

    You have a great point...Since there are no current real codes, could it be the Fuel Pump, should I test the pressure?

    Current:
    P1531 - A/C Low Side Temperature Sensor Fault

    History:
    B1327 - Vehicle system voltage below 9.0 volts
    B2810 - Steering wheel controls Entertainment Circuit Malfunction
    B1004 - Keep Alive Memory (KAM)
    B1396 - Device Voltage Reference Output 1 Circuit Range Performance
    B2891 - Tilt/Telescope Motor Over Current
    B2862 - Telescope Position Sensor Low
    B1328 - RH Sun Load Sensor Fault
    B0429 - Temperature Control #3 Rear Circuit Range/Performance
    B2882 - Tilt Position Sensor Low
    U1300 - Class 2 Short to Ground, When I jumped it I arched the cable
    U1301 - Class 2 Short to Battery
    U1064 - Loss of Communications with DIM
    U1016 - Loss of Class 2 Communication with VCM


    Doesn't sound like codes that would make the car run so bad?


    Thanks,
    ///Michael

  9. #8
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    Re: 2001 Cadillac DTS Can't get up to speed, power loss, studdering, See Video

    Quote Originally Posted by WeBeAutos View Post
    B1327 - Vehicle system voltage below 9.0 volts

    U1300 - Class 2 Short to Ground, When I jumped it I arched the cable
    Get the charging system tested, you may be on the last leg of your alternator... Unless you have another reason for these codes and having to jump start it...

  10. #9
    Ranger's Avatar
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    Re: 2001 Cadillac DTS Can't get up to speed, power loss, studdering, See Video

    Clear all those codes and see what returns.

  11. #10
    WeBeAutos is offline Cadillac Owners Member
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    Re: 2001 Cadillac DTS Can't get up to speed, power loss, studdering, See Video

    The positive terminal was dangling from my old battery, I replaced it with a new one last Friday...Also while jumping it I arched one of the cables....That has to be those codes right?


    Thanks,
    ///Michael

  12. #11
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    Re: 2001 Cadillac DTS Can't get up to speed, power loss, studdering, See Video

    Probably.

  13. #12
    WeBeAutos is offline Cadillac Owners Member
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    Re: 2001 Cadillac DTS Can't get up to speed, power loss, studdering, See Video

    Do you think it could be the cat?


    ///Michael

  14. #13
    Ranger's Avatar
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    Re: 2001 Cadillac DTS Can't get up to speed, power loss, studdering, See Video

    If the CAT is plugged you will see drivability problems at high RPM's (highway or WOT). Like trying to exhale while pinching your nose.

  15. #14
    Krashed989's Avatar
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    Re: 2001 Cadillac DTS Can't get up to speed, power loss, studdering, See Video

    Try checking the fuel pressure...

  16. #15
    97EldoCoupe's Avatar
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    Re: 2001 Cadillac DTS Can't get up to speed, power loss, studdering, See Video

    Low fuel pressure or faulty coil cassettes.

    Look out for a glowing red cat converter after trying to drive like this. Try driving like this at night, keep it floored a bit and check under the car. If you see ANY signs of the cat beginning to turn red, stop the car and let it cool down. Don't go far from home. 2 miles should tell you.

    I have seen this quite a few times and failing coils will cause exactly what you're experiencing. Low fuel pressure will sometimes throw a lean code but will also limit your speed.

    I agree with Submariner409 - sounds like a big vacuum leak. Hard to tell from a video though, could be one of your pulleys or accessories. If it's a vacuum leak, that could be largely the problem as well. Take Krashed989's advice and check that and the fuel pressure before replacing coil cassettes.


    Need parts for your Northstar Engine? www.northstarperformance.com

    Jake Wiebe, developer of the SureGrip™ Cylinder Head Stud Kit

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