2003 deville has no power when revved up, drives ok at part throttle.
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 2003 deville has no power when revved up, drives ok at part throttle. in Past Cadillac Vehicle Discussion; My 03 DeVille has250000 miles. I was losing power when revved up and gas mileage went from 20 to 17 ...
  1. #1
    warrenz is offline Cadillac Owners Member
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    2003 deville has no power when revved up, drives ok at part throttle.

    My 03 DeVille has250000 miles. I was losing power when revved up and gas mileage went from 20 to 17 on the computer.It was also taking 3 cranks to start it in the morning.I had my fuel pump pressure checked and found it was weak. I just changed the fuel pump, which fixed the starting problem and improved the gas mileage but did nothing for the lack of power and the unwillingness to rev up. When it does rev up it does not pull, just gasps as if it is running out of fuel or air. Any suggestions? The car used to have fantastic power and revved like crazy.It drives ok when cruising around town, just wont pull and doesn't want to go over 65 or 70 on the highway. it loses speed on hills on the highway and will barely pass a car.

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  3. #2
    13ir14314's Avatar
    13ir14314 is offline Cadillac Owners Fanatic
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    Pull codes and post them with their definitions. You can find out how by using the sticky at the top of the deville forum.

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 2003 deville has no power when revved up, drives ok at part throttle.

    Sounds a lot like a clogged CAT.

  5. #4
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
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    Re: 2003 deville has no power when revved up, drives ok at part throttle.

    check for Diagnostic Trouble Codes -

    if you don't know how - go here and read the ENTIRE post -

    http://www.cadillacforums.com/forums...odes-dtcs.html

    if you have any codes - post them here -
    ALONG WITH THEIR DEFINITIONS -

    -----------------------

    I'm with Ranger - sounds like a clogged catalytic converter -

  6. #5
    98eldo32v's Avatar
    98eldo32v is offline Cadillac Owners Connoisseur
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    Re: 2003 deville has no power when revved up, drives ok at part throttle.

    Post #3 is the winner

  7. #6
    SC2150's Avatar
    SC2150 is offline Cadillac Owners Connoisseur
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    Re: 2003 deville has no power when revved up, drives ok at part throttle.

    Agreed...classic clogged cat symptom, fuel filter will still give good acceleration until the feed runs out, then dies for a few seconds and back up again.

  8. #7
    PineyJustice is offline Cadillac Owners Fanatic
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    Re: 2003 deville has no power when revved up, drives ok at part throttle.

    250k on an 03, wow.

    Sounds like a catalytic issue, does the exhaust smell off?

    If you don't know when they were last done, new fuel/air filter as well as some new OEM plugs would probably be in order at that milage.

  9. #8
    cmwiess is offline Cadillac Owners Member
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    Re: 2003 deville has no power when revved up, drives ok at part throttle.

    Fuel filter, spark plugs and air filter quick and cheap things to eliminate .
    With the car running do you smell a rotten egg smell at the tail pipes? If so good indicator of a clogged cat.

    btw clogged catalytic converters are not that common of a problem even on higher mileage motors, was a problem on carburetor systems mostly to lack of maintenance.

    high mileage is more perspective used to be 100k was considered high, I have several that are over 200k and one that made it to 500k

  10. #9
    maeng9981's Avatar
    maeng9981 is offline Cadillac Owners Connoisseur
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    Re: 2003 deville has no power when revved up, drives ok at part throttle.

    Agree on clogged CAT

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