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Thread: 2003 Deville poor acceleration, (video)

  1. #16
    Fleetwood70 is offline Cadillac Owners Fanatic
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    Re: 2003 Deville poor acceleration, (video)

    hmm, I think i need to do a compression test, maybe one of the timing chains jumped.


  2. #17
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Unheard of on a Northstar.

  3. #18
    AKALEFTY is offline Cadillac Owners Member
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    Re: 2003 Deville poor acceleration, (video)

    I had something sim it was the solenoid in the tran getting stuck.

  4. #19
    Fleetwood70 is offline Cadillac Owners Fanatic
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    Re: 2003 Deville poor acceleration, (video)

    I don't know, does this looks clogged? Probably.

  5. #20
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Yes, partially.

  6. #21
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 2003 Deville poor acceleration, (video)

    What is that a picture of?

  7. #22
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    I was assuming it was the cat.

  8. #23
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 2003 Deville poor acceleration, (video)

    Can't recall ever seeing the inside of one before.

  9. #24
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    It's a ceramic honeycomb. Looks muck like the aluminum diffuser in a MAF, but longer.

    Clogging is easier to diagnose with the cat removed, so you can shine light through it, but the cat is welded to the rest of the system on the OPs car, so cutting welding would be required to check it "correctly".

  10. #25
    Fleetwood70 is offline Cadillac Owners Fanatic
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    Re: 2003 Deville poor acceleration, (video)

    Quote Originally Posted by MoistCabbage View Post
    Clogging is easier to diagnose with the cat removed, so you can shine light through it, but the cat is welded to the rest of the system on the OPs car, so cutting welding would be required to check it "correctly".
    Yes, it was the cat. I cut it off today and when I shook it, the front honeycomb was rattling inside, the insulating mat around it was broken down and all the trash clogged the rear one, I could barely see any light through it. I had my brother weld a piece of pipe in place of CAT and the car now runs like never before.
    Thanks everyone.

  11. #26
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    When you replace it, use a GOOD replacement. Cheaper ones tend to set inefficiency codes.

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