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2722Re: Crappy Gas Mileage 2008 CTS (AWD)

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  • stumpff606
    Apr 6, 2009
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      I can say that this problem is sometimes caused by either defective
      sensors or poor connections to sensors. I had this happen to me on a Chevrolet where the coolant temperature sensor (the sensor for the
      gauge is separate from the ECM sensor) had a high resistance
      connection which was read by the ECM to be low coolant temp. That
      caused the ECM to run a rich mixture all the time as if the engine
      never warmed up. Finally found the problem when the connection
      resistance got so high that the car would shut off when warmed up
      because the mixture was so rich it just couldn't run. The dealer
      should be able to track this down if he looks for error codes with
      his Tech II. Anyway, that's my experience with poor gas mileage for
      what it's worth. Hope it helps you.


      --- In Cadillac_Performance_Association@yahoogroups.com, "William Sing" <singw@...> wrote:
      > I also have the 2008 CTS with the 3.6l DI and have no problems with the
      > idle, but I do live in very warm weather all year long, maybe you need
      > to move down here to the Key West. William
      > ________________________________
      > From: Cadillac_Performance_Association@yahoogroups.com
      > [mailto:Cadillac_Performance_Association@yahoogroups.com] On Behalf Of
      > James D Hufton
      > Sent: Monday, April 06, 2009 12:33 PM
      > To: Cadillac_Performance_Association@yahoogroups.com
      > Subject: RE: [Cadillac_Performance_Association] Re: Crappy Gas Mileage
      > 2008 CTS (AWD)
      > All,
      > I have a 2008 CTS with the 3.6L DI engine but without AWD. I usually
      > drive my car in a "spirited manner" and am consistently getting 18.5 MPG
      > as measured by the on-board trip computer in the car. I have not reset
      > the long term average MPG function for at least a year, so it is truly
      > giving me a indication of the long term mileage I am getting.
      > Most of the time I am driving short trips and with the cold winter we
      > have been having, the engine is often cold when I start out.
      > I have a question for those with the 3.6L DI engine: do you occasionally
      > experience episodic (e.g. comes and goes while the car is stopped and
      > idling) rough idle when stopped at a traffic light? I recently had to
      > have the oxygen sensor replaced, and noticed that the rough idle
      > episodes continue even after having the sensor replaced. It almost
      > seems that the problem might be related to the climate control system
      > cycling the air conditioner compressor to dehumidify the air (it
      > certainly isn't warm enough in the Chicago area lately to be running
      > the AC full time). If anyone knows what causes this I would be
      > interested in hearing about it.
      > Jim
      > From: Cadillac_Performance_Association@yahoogroups.com
      > [mailto:Cadillac_Performance_Association@yahoogroups.com] On Behalf Of
      > Mike
      > Sent: Monday, April 06, 2009 9:25 AM
      > To: Cadillac_Performance_Association@yahoogroups.com
      > Subject: [Cadillac_Performance_Association] Re: Crappy Gas Mileage 2008
      > CTS (AWD)
      > --- In Cadillac_Performance_Association@yahoogroups.com
      > <mailto:Cadillac_Performance_Association%40yahoogroups.com> ,
      > "scottm9704" <scottm9704@> wrote:
      > >
      > > Hey everyone,
      > >
      > > I have a 2008 CTS (AWD) with the direct injection engine and I can't
      > > seem to get more than 15.5 MPG in combined city and highway driving.
      > To
      > > be more precise, my daily commute is about 30% city and 70% highway
      > and
      > > I'm still getting only 15.5 MPG. I've been dealing with my dealer and
      > > with Cadillac and they are helping me--they just want me to go away.
      > >
      > > Any suggestions out there? I would tell anyone looking at the vehicle
      > > to pass on it. GM is hurting, and like idiots, they aren't taking care
      > > of the very people that can help them turn the corner. All in all, I
      > am
      > > extremely disappointed with Cadillac's level of customer service.
      > >
      > > Thanks
      > >
      > I have a 2009 CTS4 (not DI engine) and my mileage is around 21 mpg
      > average. Don't get mad but so many times when poor mileage is the
      > complaint it can often be traced to how the owner drives. Using the
      > shift feature a lot, fast take offs, idling and speeding all contribute
      > to lower mpg. Are you using the remote start to warm up the car? That is
      > going suck gas and contribute to low mpg. A car burns more fuel when the
      > engine is cold and if you are just idling it and not driving, you are
      > losing economy. The price you pay for comfort.
      > A friend also has a 2009 AWD and she says she get around the same as I
      > do and she only drives it about 20 miles a day back and forth to the
      > office. Her car only has 3,000 miles on it and she just loves the car as
      > do I. I had a 2005 CTS also.
      > Mike
      > Please note: Florida has a very broad public records law. Most written communications to or from the Housing Authority regarding Housing Authority business are public records available to the public and media upon request.
      > Your e-mail communications may be subject to public disclosure.
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