1999 Pontiac Grand Prix Repair Question
Topics covered: Noise, Surge, Vacuum leak.
Mileage: 160,000 miles.
Mileage: 160,000 miles.
Asked on March 21, 2013
Pontiac Grand Prix Noise Problem
CAR STARTS AND RUNS GREAT NO NOISE ETC,HOWEVER WHEN I COME TO STOP IT MAKES A HUMMING SOUND.ALSO IF I PRESS THE BRAKE ON AND OFF AT STOP THE CAR HUMMING GETS LOUDER AND THE CAR SURGES.PS WHEN DRIVEING DOWN THE ROAD NO ISSUES ONLY WHEN I COME TO A RED LIGHT OR STOP SIGN. I CAN CRANK IT UP IN THE DRIVEWAY LET IT RUN NO MISSING OR HUMMING. THS GOT ME PUZZLE
Asked by (pending member)Answer
Replied on March 22, 2013
It sounds like you have a vacuum leak either going to the brake booster or the booster itself. Check that.
