EGR interchange - Page 2

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HT4100 4.1, 4.5, 4.9 Discussion, EGR interchange in Cadillac Engine Discussion; Well thanks for your opinion I guess but I feel comfortable that I have isolated the problem and would like ...
  1. #16
    ehall's Avatar
    ehall is offline Cadillac Owners Connoisseur
    Automobile(s): 1985 Sedan DeVille
    Join Date
    Aug 2007
    Southern Maryland
    Thread Starter

    Re: EGR interchange

    Well thanks for your opinion I guess but I feel comfortable that I have isolated the problem and would like an answer to the question I asked if anybody has it

  2. #17
    drewsdeville is offline Cadillac Owners Master
    Automobile(s): 2011 Crown Vic LX, 2009 Chevy Malibu 2LT
    Join Date
    Oct 2004
    Oak Creek, WI

    Re: EGR interchange

    Well, I don't know the answer to your question. I'd suggest trying a junkyard part so that when it ends up being a mistake, it'll be a cheap loss.

  3. #18
    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 interchange

    Quote Originally Posted by ehall View Post
    Due to the performance mods that I've made my back-pressure at low RPMs is kind of high, so the valve starts modulating sooner than intended.

    Yeah, because you measured it with a backpressure gauge and compared the results of the original exhaust system to your modified system.

    What I am wondering is if I could take a valve from a 4.5 or 4.9 and get higher mechanical resistance to the back-pressure, so that the valve did not come on until later.
    Your answer: No. The EGR opens when the ECM tells it to regardless of how much backpressure is present. As long as there is enough to allow the vacuum from the solenoid to lift the diaphragm, the egr operates as it should. Only too little backpressure will interfere with normal EGR operation.

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