04 le sabre 200k miles always mileage is 19 mpg. city or highway driving????what is wrong?no codes.
60

Asked by jimmivee Aug 16, 2016 at 09:00 PM about the 2004 Buick LeSabre

Question type: General

2 Answers
10,230

txbarney answered 7 years ago

Your car has the 3800 V6 a very good engine but with age some of the controls can fail. (1) Cam sensor...there is a magnet in the end of the cam, held in place with a plastic part...the magnet falls out and the cam sensor does not work....gas mileage and performance suffer (2) if the knock sensor fails, this can change the timing and gas mileage and performance suffer. (3) a plugged catilitic converter can affect mileage and performance.

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