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HT4100 4.1, 4.5, 4.9 Discussion, Egr in Cadillac Engine Technical Discussion; Ok I want to clean my egr, I know if it's not broke, don't fix it. But it's something that ...
  1. #1
    jwcummings's Avatar
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    Egr

    Ok I want to clean my egr, I know if it's not broke, don't fix it. But it's something that I think has never been change or cleaned on a 20 year old car. Now how in the hell do I get it off? Do I have to modify another wrench? Also want to chang my injectors, does anyone have any recomendations? I heard to go with 18psi. Thanks in advance.

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    Sevillian273's Avatar
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    Re: Egr

    I bent I think a 13mm box wrench 90 degrees to get at mine. It helps to remove the brake booster hose... Also a distributor wrench might work. Buy a gasket for it before you remove it. Honestly if it's not setting codes and your engine isnt pinging then I would leave it alone. Take a look down in the throttle body at the 2 small tubes pointing up. Make sure they are not clogged shut with carbon.

    19lb injectors for mustangs, ford explorers, crown victorias, etc will work and are cheaper but it is always best to go with the flow rate that was intended for the engine so that the control system doesnt have to adjust...

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    HUF
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    Re: Egr

    Yeah, leave the EGR valve alone.

  5. #4
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    drewsdeville is offline Cadillac Owners Master
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    Re: Egr

    If you want to do the EGR, I recommend taking off the throttle body. It makes getting at the EGR a snap and also allows for excellent cleaning access to the throttle body itself and the EGR tubes. It's really easy to get the throttle body off. Once you count in the time it takes you to work with the tight spot the EGR is in, it probably takes the same amount of time just to do it this way...

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    Re: Egr

    ok thanks for the feed back still debating

  7. #6
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    Re: Egr

    I think on the 4.9 cleaning the EGR tubes in the TB is more important than the EGR itself.

  8. #7
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    HUF
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    Re: Egr

    Quote Originally Posted by drewsdeville View Post
    If you want to do the EGR, I recommend taking off the throttle body. It makes getting at the EGR a snap and also allows for excellent cleaning access to the throttle body itself and the EGR tubes. It's really easy to get the throttle body off. Once you count in the time it takes you to work with the tight spot the EGR is in, it probably takes the same amount of time just to do it this way...
    Ditto.

  9. #8
    steelybill is offline Cadillac Owners Enthusiast
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    Re: Egr

    Of course if you remove the throttle body, you need a new gasket for that too, since the old one may not seat exactly where it was before you removed it. Just a pre-caution to prevent a leak.

  10. #9
    jwcummings's Avatar
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    Re: Egr

    ok I have the 4.5 MPFI where are the egr tubes in this TB?

  11. #10
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    Re: Egr

    under the throttle blades.

  12. #11
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: Egr

    Quote Originally Posted by Ranger View Post
    I think on the 4.9 cleaning the EGR tubes in the TB is more important than the EGR itself.
    If it ain't broke don't fix it. I would just clean the tubes and call it good like Ranger said.

  13. #12
    jwcummings's Avatar
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    Re: Egr

    ok got the code 48 today took the egr and tb off and cleaned them today, new gaskets and vac. hoses Purrs like a kitten and has alittle more peep in her step

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