4.9 EGR Removal??? - Page 2

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HT4100 4.1, 4.5, 4.9 Discussion, 4.9 EGR Removal??? in Cadillac Engine Discussion; Originally Posted by 91TexasSeville Just for the benefit of others reading this thread....4.9L 1992 Eldorado Normally the EGR will not ...
  1. #16
    geno11 is offline Cadillac Owners Member
    Automobile(s): 1991 eldorado
    Join Date
    Sep 2011

    Re: 4.9 EGR Removal???

    Quote Originally Posted by 91TexasSeville View Post
    Just for the benefit of others reading this thread....4.9L 1992 Eldorado

    Normally the EGR will not set a code until it is completely shot. The first signs of a suspect EGR or EGR solenoid are pinging under light acceleration. And of course high emssions at the test facility.

    I tested my EGR solenoid first when I experienced pinging under light acceleration. It only did this when the engine was warm and after maybe five or six miles of driving time. Once the engine was at normal operating temperature it would ping all the time under light acceleration. Fuel consumption (mileage) was not affected that I am aware of. By the way, my car passed Texas emissions test with the pinging at warm engine. The car was cold when tested because it sat overnight at the facility. They (the facility) could not get to it the day I took the car in for testing.

    So why change the EGR if it passed emissions? Believe it or not, you really do need it to work properly and mind did not. And yes, I checked all the vacuum tubes, crazy ells, and such to find them in good condition. I also checked the ignition timing, ISC, and TPS to ensure they were to factory specification. They were.

    I really did not think the EGR was bad. I was convinced there was a leak or some other problem. Once I had eliminated all the other suspect parts, I replaced the EGR valve assembly. I used a 13MM distributor wrench to remove the bolts and replace the EGR and gasket.

    I am happy to report that the ping is gone.
    how do u replace the egr? can any body walk me threw, the prosses ,i have a 1991 eldorado and dnt no wat im doing

  2. #17
    dennis93coupe's Avatar
    dennis93coupe is offline Cadillac Owners Connoisseur
    Automobile(s): 1993 Coupe Deville, 2009 XLR-V 1 of 6 Crystal Red
    Join Date
    Feb 2010
    Orange County, CA

    Re: 4.9 EGR Removal???

    It will be easier to remove the throttle body first, otherwise you need special wrenches to get to the 2 bolts from underneath. When you get the Throttle body and EGR valve off, it's also easier to clean the intake manifold tubes.

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