2004 N* fuel choices...premium wins - Page 3
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 2004 N* fuel choices...premium wins in Past Cadillac Vehicle Discussion; Originally Posted by BlackInjun but I do know I get better gas mileage and more power when I put gas ...
  1. #31
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Quote Originally Posted by BlackInjun

    but I do know I get better gas mileage and more power when I put gas in the car.
    Yup, my car gets better mileage and has more power when there's gas in it too.

  2. #32
    basscatt's Avatar
    basscatt is online now Cadillac Owners 10000+ Posts
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    Re: 2004 N* fuel choices...premium wins

    Quote Originally Posted by BlackInjun View Post
    I think Moist is absolutely correct here (meaning all his posts). In fact I think everyone here should realize that moistsubbass.... nevermind I can't remember, but I do know I get better gas mileage and more power when I put gas in the car. Also more importantly it's 60 degrees outside in DC.
    -----------------------------------
    Also more importantly it's 60 degrees outside in DC.
    and it's 80* and very humid in Guam today -

  3. #33
    BlackInjun is offline Cadillac Owners Member
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    Re: 2004 N* fuel choices...premium wins

    Quote Originally Posted by MoistCabbage View Post
    Yup, my car gets better mileage and has more power when there's gas in it too.
    Yep, lets see someone disagree with that one. Mine for some reason refuses to run without it.

    Quote Originally Posted by basscatt View Post
    -----------------------------------
    Also more importantly it's 60 degrees outside in DC.
    and it's 80* and very humid in Guam today -
    Wow is that near Florida

  4. #34
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    Re: 2004 N* fuel choices...premium wins

    Quote Originally Posted by SUPER LAC DEVILLE View Post
    "bad EGR valve".... if knock is the clacking noise when i step on the gas... can i fix/replace it... wheres it at?????????
    Yes, actually more like marbles in a tin can when you step on the throttle, but "clacking" is not a bad description. The EGR can cause that, but it is an emission control item and is monitored so it would trip the MIL and set a DTC if it failed. It's a large black canister with a plug on top near the master cylinder. If that where the case all it would need is a good cleaning (tutorial in Tech Tips).
    SUPER LAC DEVILLE likes this.

  5. #35
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    Re: 2004 N* fuel choices...premium wins

    Quote Originally Posted by BlackInjun View Post
    Yep, lets see someone disagree with that one. Mine for some reason refuses to run without it.



    Wow is that near Florida
    ---------------------------
    Wow is that near Florida
    compared to what? - and which way you are going -

  6. #36
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    Re: 2004 N* fuel choices...premium wins

    SUPER LAC ........... EGR ............ Exhaust Gas Recirculation - an emissions system that recirculates (!) some exhaust gas from the right (rear) manifold into the incoming intake air in order to dilute the oxygen content, thus slowing down combustion in order to control emissions of nitrous oxides. Given all the ignition, mixture, EGR, and air controls these engines have, ANY screwed up intake fuel mixture can cause a "knock" - in this case it's the old "dry peas in a can" analogy: With restricted EGR flow you get a slight increase in fuel burn rate - a "ping" - upon part throttle or passing power demands.

    Years ago we could blank off the (prehistoric) EGR system, fool with timing adjustments, and get a TINY power increase way up in the power band. Not so today, with the tight electronic emissions controls.

    On your engine the EGR valve is on top of the right (rear) cylinder head, just about in front of where your gas pedal toes would point. About the size of a little Minute Maid orange juice can.
    SUPER LAC DEVILLE likes this.

  7. #37
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    Re: 2004 N* fuel choices...premium wins

    Quote Originally Posted by Ranger View Post
    Yes, actually more like marbles in a tin can when you step on the throttle, but "clacking" is not a bad description. The EGR can cause that, but it is an emission control item and is monitored so it would trip the MIL and set a DTC if it failed. It's a large black canister with a plug on top near the master cylinder. If that where the case all it would need is a good cleaning (tutorial in Tech Tips).
    Quote Originally Posted by Submariner409 View Post
    SUPER LAC ........... EGR ............ Exhaust Gas Recirculation - an emissions system that recirculates (!) some exhaust gas from the right (rear) manifold into the incoming intake air in order to dilute the oxygen content, thus slowing down combustion in order to control emissions of nitrous oxides. Given all the ignition, mixture, EGR, and air controls these engines have, ANY screwed up intake fuel mixture can cause a "knock" - in this case it's the old "dry peas in a can" analogy: With restricted EGR flow you get a slight increase in fuel burn rate - a "ping" - upon part throttle or passing power demands.

    Years ago we could blank off the (prehistoric) EGR system, fool with timing adjustments, and get a TINY power increase way up in the power band. Not so today, with the tight electronic emissions controls.

    On your engine the EGR valve is on top of the right (rear) cylinder head, just about in front of where your gas pedal toes would point. About the size of a little Minute Maid orange juice can.
    ok, great info here, thanks much... can i clean it with wd40 or degreaser if it needs it????

  8. #38
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    Re: 2004 N* fuel choices...premium wins

    You'll need carb or TB cleaner. A dental pic works great for scraping the pintle valve.
    SUPER LAC DEVILLE likes this.

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