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Thread: egr problems?4.9

  1. #1
    rick davenport is offline Cadillac Owners Member
    Automobile(s): sedan deville
    Join Date
    Nov 2009

    egr problems?4.9

    95, 4.9 deville chugs at 45mph after tranny rebuild.was told to change egr and after cleaning tubes, still chugs so till my mech can cleanout intake.egr disconnected it runs ok.for 1/2 hr.then car is horrible no power and motor is noisy. cat was checked. is this egr related?

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  3. #2
    the recluse is offline Cadillac Owners Connoisseur
    Automobile(s): 2002 STS, 1991 Eldorado
    Join Date
    Feb 2009
    Jacksonville, FL

    Re: egr problems?4.9

    Motor noisy? Chugging? With a tranny rebuild there is soooo much R & R'd, where do you start?

    Are you sure all the vacuum lines are in place? Is the car timed properly, that would cause a "chugging" and noisy motor? Did he miss a harness or grounding strap?

    Lots on a punch list I would start with assuming it was running right before the rebuild...

  4. #3
    Sevillian273's Avatar
    Sevillian273 is offline Cadillac Owners Connoisseur
    Automobile(s): 69 Thunderbird | 90 Seville | 89 Marquis | 72 Torino
    Join Date
    Oct 2008
    Palm Bay, FL

    Re: egr problems?4.9

    Yeah a ton of variables here... very hard to say over the internet but one thing that comes to mind is the viscous converter clutch also known as TCC or VCC. It does kick in around 45mph or maybe a tad earlier and can somewhat 'bog' down the motor especially when passing. I actually wired a switch to disable mine because I just dont like the way it feels. Its hard to say w/o riding in your car myself but might be something to mention to your mechanic.

    Btw, you say your motor gets 'noisy' 1/2 hour after disconnecting the egr? That's probably because it's pinging w/o the EGR. It's kind of a metallic knocking/clanging sound... yet another thing that's hard to diagnose from behind a keyboard.

  5. #4
    cadillac_al is offline Cadillac Owners Connoisseur
    Automobile(s): 70 Deville 77 Fleet 78 Seville 92 Deville 03 Deville
    Join Date
    Feb 2007

    Re: egr problems?4.9

    no codes? It seems like if it was running that bad the SES light should be on.

  6. #5
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: egr problems?4.9

    EGR actually cools the combustion temperatures. It also reduces spark knock. If you disconnected it, your problem is likely self inflicted.


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