4.9 Deville Concours driving terrible again!
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HT4100 4.1, 4.5, 4.9 Discussion, 4.9 Deville Concours driving terrible again! in Cadillac Engine Technical Discussion; I'm getting terrible performance from my 4.9 Deville, so far I have had the Gas Filter replaced, Fuel Pump relaced, ...
  1. #1
    rlowe228's Avatar
    rlowe228 is offline Cadillac Owners Member
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    Exclamation 4.9 Deville Concours driving terrible again!

    I'm getting terrible performance from my 4.9 Deville,
    so far I have had the Gas Filter replaced, Fuel Pump relaced, and even a few out of the 8 injectors replaced, but im still getting the same terrible performance issue I had since i replaced all these parts....I could driive the car in one direction and it would drive perfect but on the way back home I would have really bad performance . rough, hesitation and back firing is one of the symptoms. It's really random.
    Please Help.

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  3. #2
    caddydaddy's Avatar
    caddydaddy is offline Cadillac Owners Connoisseur
    Automobile(s): 2005 Escalade 6.0L 2WD, 2007 Jeep Grand Cherokee Limited CRD
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    Re: 4.9 Deville Concours driving terrible again!

    Have you checked the fuel pressure regulator? Also, I'd check the computer codes for any possible problems.

    Also, if your Deville has the 4.9 L, it's not a Deville Concours. They were 4.6 L Northstar only!

  4. #3
    rlowe228's Avatar
    rlowe228 is offline Cadillac Owners Member
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    Re: 4.9 Deville Concours driving terrible again!

    no error codes, ill check the fuel pressure regulator, any other solutions.

  5. #4
    caddydaddy's Avatar
    caddydaddy is offline Cadillac Owners Connoisseur
    Automobile(s): 2005 Escalade 6.0L 2WD, 2007 Jeep Grand Cherokee Limited CRD
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    Re: 4.9 Deville Concours driving terrible again!

    A throttle body cleaning wouldn't hurt. Also be sure to check the EGR tubes that are under the butterflies. They can get plugged up over time and cause driveability problems.

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