Poor gas mileage/Sensors, please help a bit! - Page 2
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HT4100 4.1, 4.5, 4.9 Discussion, Poor gas mileage/Sensors, please help a bit! in Cadillac Engine Technical Discussion; Do you think it might be the temp sensor that you fixed?...
  1. #16
    cadillac_al is online now Cadillac Owners Connoisseur
    Automobile(s): Cadillac 78 Seville, 78 Coupe de Ville, 92 Sedan de Ville
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    Re: Poor gas mileage/Sensors, please help a bit!

    Do you think it might be the temp sensor that you fixed?

  2. #17
    wikked_magick45 is offline Cadillac Owners Member
    Automobile(s): Cadillac Seville 4.9L
    Join Date
    Oct 2007
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    Saginaw, MI
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    24

    Re: Poor gas mileage/Sensors, please help a bit!

    I don't think that's my case. New symptom - from a dead stop, *sometimes* only when cold, I give half throttle and I get ALL EIGHT cylinders for about 5 seconds, then *insert fart sound here* back to 7 or 6 with a bad vibration and lack of power. I went to the junkyard today and got a used fuel rail, injectors, and wire harness from a DAMN good running Deville 4.9. I hope this will solve my problem.

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