2005 Deville changed my oil and now my service light is on? - Page 2
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 2005 Deville changed my oil and now my service light is on? in Past Cadillac Vehicle Discussion; Originally Posted by Ranger Nothing to reset. I suspect that the MAF sensor was trying to compensate for the vacuum ...
  1. #16
    MoistCabbage's Avatar
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    Quote Originally Posted by Ranger
    Nothing to reset. I suspect that the MAF sensor was trying to compensate for the vacuum leak. Have you replaced the plenum duct yet?


    Quote Originally Posted by Daddys05Caddy
    It is normal for a engine to run better without the MAF?
    Only if the MAF is dirty or defective.

  2. #17
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    Re: 2005 Deville changed my oil and now my service light is on?

    ....

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    Re: 2005 Deville changed my oil and now my service light is on?

    As posted several times, you do the tests for vacuum leaks BEFORE trying to remove the MAF and put it on a test bench for airflow and data transmission measurements. You posted that you had disconnected the intake air ducting - that needs to be verified for tightness and integrity before going on other witch hunts.

    There are specific codes - which will set in your car's DTC system - for MAF faults, including electrical and data flow. As posted, ANY air intake leak at or after the MAF will set lean mixture codes. If you unplug the MAF the PCM defaults fuel/air mixture to a default setting and codes set.

    Pictures in my albums.

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    Re: 2005 Deville changed my oil and now my service light is on?

    Have not done that one yet...Wanted to rule out the MAF sensor first.

  5. #20
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    Re: 2005 Deville changed my oil and now my service light is on?

    ....

  6. #21
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    Re: 2005 Deville changed my oil and now my service light is on?

    Just wanted to update you guys and once again...Thanks for all your help. Found a broken Vacuum elbow under the lid. Real fun finally getting the broken one out but all repaired and running great now.

  7. #22
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    Re: 2005 Deville changed my oil and now my service light is on?

    So it was the elbow for the PCV dirty air line - into the end of the intake manifold ?

  8. #23
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    Re: 2005 Deville changed my oil and now my service light is on?

    Yes sir...Why would they bury that there?
    By the way...Where can I purchase that elbow? I had to rig a curled piece of fuel injector hose and think its a little too pinched up.

  9. #24
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    Re: 2005 Deville changed my oil and now my service light is on?

    Look through the Help! racks at a large parts store. Or remove the intake manifold and run a single piece of proper sized fuel hose (braid in the outer jacket) from the manifold nipple to the PCV.

    Study the several intake manifold pictures in my albums - the PCV dirty air enters the manifold in the center of the intake airstream - halfway to the throttlebody - so that air stands a pretty good chance of being mixed in the lower log and distributed evenly to all 8 cylinders.*

    Study up on PCV systems to get the big picture.

    ............ PCV airflow is part of the calibrated idle air control - Our later Northstars have a fixed orifice - no rattle valve - but the rattle valve part numbers are car/engine specific because of that airflow figure.

    *You'll notice in this picture that the incoming fresh air does not simply drop into the intake manifold log - it flows to a rectangular opening between cylinders 2-3-4-5 and then drops down into the distribution log. Hard to see, but that PCV air inlet is in the curved flow director to the lower log. You can just see the bottom edge of the log under the overpressure valve. That's where the individual port runners start - 250 degrees away from the port they feed.

  10. #25
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    Re: 2005 Deville changed my oil and now my service light is on?

    Really appreciate the info and taking the time for the pics...Thanks

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