why would my '99 buick regal suddenly get approximately 100 miles less a tank?

Asked by vallanX Dec 01, 2016 at 08:21 PM about the 1999 Buick Regal GS Sedan FWD

Question type: Maintenance & Repair

same route every day, regular maintenance, I used to get about 350miles to
the tank and now suddenly I get about 220 miles to the tank. What is wrong
and how do I fix it?

1 Answer
10,210

txbarney answered 7 years ago

I have had the knock sensor go haywire and it was sending a way high signal to the ECM causing the ECM to retart the timing all the time...this affected performance and gas mileage

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